Thank you Jeff that’s very kind of you. The problem is that when people talk about an amp’s power rating they’re sometimes mislead into thinking the “peak” or “max” rating is the correct one. The amplifier is Pyle PLMRA630BT. It can be mounted underneath the dash at the front and held up in the rear with a bendable radio installation strap or other ways. Max power output…80W x 4(4 Ω) / 130W x 4 (2 Ω) / 520 W Total ( Bridge ) 4 speakers , 2 subs, 4 channel amp - Well I like to install 2 fronts 2 rears and 2 subs using my 4 chennel amp can I do this and is so whats the best way to get it done? No, in most cases you can’t as monoblock amps usually only produce a low-pass (bass) output. You can definitely use a single 4 channel amp that’s 2Ω capable to run all 4 pairs of speakers if you like. Those may need a data line-to-remote wire adapter. I'd love to help everyone find answers to their questions & enjoy good sound. Here’s a suggestion to start with regarding the front & rear speakers: As the Civic is supposed to use 6.5″ speakers, here’s a 4-speaker set of Polk DB651 coaxial speakers with silk composite tweeters that will give very nice sound. Thanks! You should be fine with 50W rated resistors for most 4 channel amps. Good stuff to know, thanks. The GM-D8704 has speaker level inputs built in that will let you connect directly to the speaker level outputs of the Sony head unit. Yep, you can use capacitors in series. Otherwise, there’s a good chance the amp would have to be turned down to match the head unit’s more limited output. Yes that’s right, or just use a wiring harness adapter so you don’t have to cut the factory wiring. : Use only ONE of the two connections shown. If the meter has an auto-ranging function you should be fine. If that’s not available, yes I would try left channel – = subwoofer negative, and right channel + = subwoofer positive. Today’s head units offer Bluetooth, music app controls, EQ functions, and much, much more for under $100. For your amp you can just set the 2/4 channel amp switch to the “2” position, then bridge 2 channels and set the low-pass crossover. Multimeters show an open circuit condition as “infinite” Ohms, which just means there’s no reading to be made. It is just a steady low hum which goes on and off. Adding subs to a boat. That sounds great, Steve. 4 channel amps that handle 2 ohms bridged are less common but they are out there. There’s just no way around it. Actually, there are a lot of newer head units that are much better than the Sony you have. (Note: Go by the RMS or “nominal” power ratings for the speakers, not the “peak” rating to know their continuous power ratings. depending on the rating of the amp and the rest of your system, you should probably go the 4 ohm direction (or trade in your amp if your hearts set on running a 2 ohm set up good luck. Thanks for your quick reply. how you "series" the voice coils on each sub is take a short peice of speaker wire and connect a positive lead to a negative lead together and use the remainder positive and negative lead to connect to the amp. You can use the speaker-level inputs to go from the factory head unit to the Pioneer amp, then out of the amp and back to the factory speaker wiring near the radio. (The KMM-xxxx series for example). Following the example I’ve provided here in the diagram above it’s pretty easy. I look forward to your response, Its the Audioque 2200. If your stereo doesn’t have output channels that’s ok! Just trying to figure this out. That’s because each speaker’s design is a bit different from the next. My best advice would be to forget about using the original radio for several reasons. (Example: two 4Ω speakers on a 50W/channel amp will now be able to get only get up to 25W each). To drive 4 speakers and a sub with a single 4-channel amp you’ll have to make a few compromises. switch or RCA Y adapters), then back from the amp to the factory front speaker wiring as I mention in the article (easier doing it at the dash). Good Luck, hope this was helpfull. The speaker impedance or “Ohms” rating of a speaker (also called the speaker load) is the resistance to the flow of electrical current that the amplifier sees at the speaker terminals. Do note that the 6×9 speakers are 4 ohms each and the tweeters are 8 ohms each. now adding a third and if wired the third like the others I’m down to .33 ohm load and the amp is only stable at 1 ohm. However, since a few amps out there can’t handle 2 ohm loads (especially older amps you might have that you’d like to use) I’ve included this just in case. 1 & ch. It won’t hurt anything but 8 ohms subwoofers are best suited for home amps & not car amps. However, you’ll want to buy the right kind of resistor. They are single voice coil 4 ohm subs with 300 watts rms and 1000 watts peak. You can use an L-pad (speaker volume attenuation) site like this one here to calculate resistor values for you. I want to connect 4 door speakers and a sub as shown in your #1 figure. Why is this best for driving a subwoofer? If I consider doing Option #1, will it be fine considering all my speakers are rated 4Ω. this Metra 99-9000 kit I use for installations. After many hours of research and frustration, im still unable to find a way to wire my subs up correctly. Is that possible? Disclaimer: * All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Sooo how can i wire my 2 12 inch svc 4ohm kenwood subs to my 2-channel autotek amp. The Kenwood units offer a better EQ however. Cut a smaller length 18 inches long and strip an inch of the insulation from the both ends of the shorter cable and on the end of the long lead. Wiring a 4 channel amp to 2 subwoofers. Cheers, Bill. They’re also a great buy used too. Adjusting the fader would affect the volume to the main speakers vs the subwoofer but doesn’t serve any purpose in that case so you’d leave the fader set to the middle. While you won’t find them in many local stores, the good news is that they’re affordable. Very few people drive their speakers at full power/full volume. If you’re having problems with the left to right stereo signals, then it sounds like either the RCA inputs or speaker connections (or both) are incorrect. 2. Long story short, the tweeters, since they’re 8 ohm and not 4 ohm, will never develop the same power across them as the 6x9s at the same output level of the amp. However, if the amp has a high pass crossover built in that’s better for a number of reasons. While there are several ways you can go about it, wasting gas, time, and getting stressed out isn’t worth the headache. Sub output on headunit goes to channel 3&4 on amp. Sounds great and I’ll work with crossover High and Low filters to refine. (Assuming you have RCA outputs and you’re not using speaker-level inputs on the amp, which is another option you have too). I recommend a model with adjustable level outputs (PAC and Scosche make some very good ones). What does the minimum impedance (Ohms) rating mean for an amp? Hey Marty. Note the markings above the connectors. Thanks so Much. The answer to this is the 4 speaker and 2 channel amp configuration which has become quite famous these days. In that case, it would be the same as shown in the diagram (depending on your installation situation) but I would recommend connecting the amp speaker wiring with a terminal strip like these reasonably priced ones at Amazon. What is an ideal power resistor for a 4 speaker of375w connected to an amplifier of channel of1000w with a subwoofer of 1800w ..how many watts resistor should I go for and what resistance?? Good question, actually. Personally I would recommend sticking with 1 speaker + 1 tweeter (or 2 speakers instead) unless you use 2-way crossovers. That’s enough for decent bass depending on the subwoofer, box, and vehicle you have. Always be sure to check your speakers before you wire them to your amp to be sure they’re compatible. • Rear door speakers + rear deck speakers -> rear amp channels. That’s 80W for the 6x9s and ~50W for the tweeters, according to the specs). I’m a little confused about the RCAs still. Your amp will run hot and possibly become damaged. I’ve seen a few instances of odd problems when using speaker-level inputs, however, so it’s not unheard of. Then the same for the right channels. Can I connect to RL and RR. My amp is pioneer GM-A4704, if I use for speaker level connections as your diagram. Would there be any difference? Currently have polk audio pa4a head unit, wet sounds 4 channel amp and 4 6.5 wet sounds speakers. However, it is possible to wire a 4 channel amp to 4 speakers and a sub! I wonder how I can connect the front speakers together with their tweeters (wich an in-line crossover in their wire). However, it’s worth a try to see what you think & if it works for you! I was reading and sounds like I can bridge the amp to add a single sub as Marty described above, but was hoping could add 2 subs?? Connect the from RCA outputs to the front amp channels then the subwoofer output RCAs to the rear channels. Thank you, I’ll definitely spread the word about your site on my forums. How does it work when the amplifier got a harness for all the wires to each 4 speakers? is this correct? If you’re wiring 4 speakers and a subwoofer to a 4 channel amp, by adding 60 ohm resistors to the rear speakers you’ll drop the volume by 24dB (decibels). I am SO grateful. You can find one for around $100-$120 or so, and they’re pretty good. Thanks (Sub is Fusion MS-SW10). 1 & 2 or 3 & 4 with that amp. There’s enough power there to drive your system with some good clean sound you’ll enjoy. I’ll describe 3 main system setups which I’ll cover in detail. The GM-D1004 is rated for down to 2 ohms in stereo mode, actually, but that shouldn’t matter in this case. I have a pioneer gm-d9704. Thanks. Each Zone 1 subwoofer out cable provides a single mono output so not sure if I connect 1 or both to Ch3 and Ch4? I am 48 and no stranger to connecting amps and subs. Since you didn’t specify the amp brand & model, I can’t say for sure. Usually that will not cause a problem (at least it shouldn’t at regular listening levels). Speakers are usually connected in series or parallel (well, really, most often in parallel) which affects the total resistance an amp will see. I’ve seen this happen when people try to “get more power” by incorrectly wiring speakers to an amp. Most of the stuff online is either not enough or just plain BS that a seller would write. I’ve used them many times for speaker problem-solving. How is speaker wattage rated per pair or each? – JBL Co-axial (rear) My advice is to pick up a good amp wiring kit and the tools you need beforehand. Hopefully the 10″ speakers will sound like you hope; if not, you may need to get some dedicated subwoofers and/or a better amp with a low-pass crossover. Wire them parallel. Main speakers (I’ll pick 5.25″ as an example as you didn’t specify): • Not 2 but FOUR door speakers Good morning, Wayne! Honestly, the best thing to do at this point is to get a good quality line-level converter. What is “bridging” an amp? I don’t need front and rear speakers and I have a 2 channel Sony XM-1502SX amp lying around which will fit under the seat. They’re inexpensive and are easy to use. 2 speaker-level inputs. You’ll need to bridge 2 channels in order to have enough power to drive a subwoofer well. Most amps would need to be connected to a signal for the rear channels also but since yours has a 2/4 ch. Question about connecting marine Fusion MS-RA70N zoned head unit to Fusion FM-504 4 channel fully regulated 2 ohm stable amp. Hi Stu. Sorry if its been asked already. Additionally, I see that the Kenwood head unit has subwoofer outputs so you may be able to turn that signal down as well. That should be enough in most cases: Not totally silent in the rear, but most of the volume towards the front speakers. This way you can adjust the gain/outputs separately to have them match in terms of volume. You can use two 8 ohm subwoofers wired in parallel or two 4 ohm DVC subwoofers each wired for 8 ohms, then connected to the amp in parallel. Hi Ryan. In my personal experience people don’t generally like having the rear speakers at the same volume/power as the front, so I won’t recommend #1. I know those were not used previously but should I try connecting those to the amp as well? Just not sure about the RCA connection from the head unit to the amp. Shown: An example of how to measure speaker impedance (Ohms) with a multimeter. Also, be 100% sure you’ve got it bridged correctly just to remove any doubt there too. Hi Marty, I have tried option #1 for a start just to try if it will work. Use your wire hanger to slide the power cable through the hole that you made. Then bridge the rear channels to drive the subwoofer. Marty, I have been searching all over the internet for help with my amplifier in my boat. Yes, that amp does support two 4 ohm speakers in parallel as a 2 ohm load, so yes option #1 would work if you think you’re ok with that. More than likely it won’t be a problem. If I treat these as 3 ohm speakers, should I add 25W 2.5 ohm resistors to the circuit to get my 4 ohms to make the amp happy? If using speaker level inputs on the amp, use the connections shown above. I know its mono but i thought in the input i can also have 4channels. I like this deck basically because it has separate bass and treble & Blue tooth. However, if we add one 4 ohm power resistor in series with each speaker we can use the math to our advantage. Worst case I would just run it at 2ohm until I get different gear. It's still going to be run at 2 ohms though, and you shouldn't have a 4 channel amplifier for subwoofers, you should have a monoblock class D amp. You can save money on the subwoofer and still have excellent bass, so have a look at the Skar or Rockville subwoofers. If a CD player isn’t critical, you can get a great modern Bluetooth/USB/HD radio Kenwood, for example, for around $100 or less. And I’m feel so relief. Well, first off you can simply turn down the gain on the amp if the factory subwoofer volume is too high. My head unit has 4 RCA out puts. Anyway, in this case there’s no “perfect” solution, unfortunately. I have factory 2 ch. I really appreciate your expert opinion. Let’s say I left my 2 tweeters hooked up to run off my HU, that would leave my 4 speakers + 1 sub. Leave the 2 rear speakers connected to the stock stereo. Well, you’d need a decent amp (and a 2 ohm stable one) to run all 4 speakers and a sub off on just one. And also I’m getting less sound o/p from Components than Co-axial. Likely they need more power to drive them than the coaxials, that’s why. Does this mean that the amplifier supports 4Ω and 2Ω connection? I have an additional query if you don’t mind. The good thing is you’ll be fine with your amp. How about those line out gain & factory amp gain on SLC? However, usually the bridged wiring is labeled on the amp itself. The Pioneer’s internal circuitry scales down the speaker level signals to line level. The little amp can’t run below 4 ohms. Wiring a 4 ohm amp to a 2 ohm speaker is done often by car stereo enthusiasts. that will give you a 4 ohm load on the each bridged section of the amp wich will allow that amp to function properly and to run cooler and not go into "protect" mode. To channel 3, I’ve attached the upper left side speakers Jason. Ch A – Connect 2 front speakers That model doesn’t need a remote-on wire usually as it has auto-sensing for the speaker inputs. Hi Stephen. then a wire from the pos. NOTE! • Rear 6x9s It’s a lot better to start on the right foot and be ready at installation time. (For example “1000W” may actually be only about 250-300W or etc). I do have an odd question perhaps. I tried disconnecting the input signal from the amp and it goes away. I would recommend a 5-channel amp with at least 50W RMS per channel for the main speakers and 250W+ for the subwoofer channel, and 2 ohm capable too. Then bridge the rear channels and use the low pass crossover. Bridged mode (mono mode) is a built-in amplifier feature in which a “push-pull” set up is created: one channel (normally used for the left speaker) produces a signal that’s the opposite of the second channel (normally used for the right speaker). Im opposed to only running one coil on a DVC sub. So do I cut the factory speaker wires after the harness then go into the scosche and so on. If you’re using a 4 channel amp like in setup #1 as you said, you’ll just ignore the Zone 2 RCA outputs. Bridge each subwoofer to 2 channels, one on top, one on bottom, and you will get more wattage. :). The problem is that each 8 ohm subwoofer will develop 1/2 the power a single 4 ohm model would so it works out about the same as using only one. It’s a 96 Honda Accord Thank you sir. Lets start with the 2 channel: 2 channel amplifiers We will start with the most common, the two channel amplifier. 2 speaker-level inputs. – Connect the 2 subwoofer RCAs from the Sony to the amp, let’s say ch. Step #1 – Choose the # of subwoofers you will wire in your system from one amplifier output. Right channel to front right, rear right. As most modern car amplifiers include very nice optional crossovers, for good sound it’s smart to take advantage of those. Hi Marty, this page is much more helpful than anything else I’ve found, but since I’m a nuts and bolts guy, sometimes electronics gives me blurred vision. So once you start cranking up the volume the tweeter output level won’t match that of the other speakers unfortunately. Thanks. Thus in effect doubling the power each channel, say you amp was 200 watts. Option 1 i have a kicker zx650.4 amp and two 2 ohm DVC memphis m3 12" subs. Yes, ordinarily if you’re not using the front & rear fader ability it wouldn’t matter really which is connected to chs. of the second ch. Load Impedance…4 Ω (2 Ω to 8 Ω allowable ). Seems like it shouldn’t be that complicated…but I’m stumped. I would set the output levels on the SLC4 to about 75% and see how that works out for you. Ch B – Connect sub Also the specific Auditor model number is not listed either so I’ll go by the standard suggestion here: 1. To channel 4, I’ve attached the upper right side speakers You can wire 1 coaxial to 1 tweeter if they're both 4 ohm to the front left channel and the other 2 2 the right front. 3. Regarding your question about the power rating, 25W should be fine but there’s certainly no harm in getting ones with higher power ratings if there’s not much difference in price. I recommend about 60 Ohms as it will give a volume reduction of 24dB. Shown: Example of a 4-channel amp bridged to 2 channels. If not, you’ll need to try connecting the other channels as I mentioned. If yours doesn’t, you’ll need a work-around I’ll show you. I really appreciate finding this information here. You can find one $75 and under with a ton of power that can drive a 2Ω load (two 4Ω 12″ wired in parallel for example). You may need a few extra parts. There are some versions available in double-DIN also, as well as some models by Pioneer that are pretty good too. Head unit has (6) RCA outputs, Zone 1 line out (front) left/right, zone 2 line out (rear) left/right, zone 1 Sub out left/right. What do you think of the answers? How do I connect sub? Hi Marty, I have a old Sony MEX-BT2500 deck. Of the three choices, I think #2 and #3 are the ones you’d (most likely) be happy with. In the case of a car amplifier that can’t go below 4 ohms per channel, there’s no other way. – The connections for the bridged subwoofer wiring depend on the amp. Hi Jeff. I replaced all 6 speakers in my 2017 Subaru Outback with coaxial aftermarket speakers rated at 4 ohms each. For 4 ohm speakers, use a 4 ohm resistor. So I wired the front 2 speakers off the head unit, then I used the RCA Rears to wire the 4 6×9 speakers as you described in parallel using channel 1 & 2 and bridged the sub to channels 3 & 4 like described. Really appreciated. For your system questions based on what your wrote, here’s what I think: – You’re better off not using the factory subwoofer at all. Power resistors are larger versions of the resistors used in many electronic products. Really the best thing to do would use a 4 channel amp and bridge the rear channels for the 12″ or add a second amp if you already have the monoblock amp. Here’s an example chart to help you know what to expect when measuring speakers. They’re fairly small now, too, so they’re easier to install as well. Single 8 won't do much. Is there any newer decks that have separate B & T?? I know I will use a crossover even though they have full range. – Kenwood HU with 2 P/O Today’s 4 channel (and other) car amplifiers have a minimum speaker load they can handle. A speaker’s impedance value, measured in Ohms, is just the total measurement of electrical resistance the amp will see from the speaker’s voice coil. By adding inline resistors to the rear speakers you can drop their volume and it acts as a “fader” already. Here are some good recommendations for the 4 main speakers and the subwoofer: By using a high-pass filter for the 4 main speakers you can crank the volume when you want for more power & sound before distortion happens. It will depend on (1) the amp’s power output capacity and (2) what the amp’s gain is set to. Thanks for the great advice. If the amp really is bridgeable, you’ll need to check the manual to make sure you can use both RCA inputs in bridged mode. I can’t stress enough how important it is to be ready to install your 4 channel amp. If that Amp. Getting wiring through the door is often a terrible job and in my experience the factory speaker wiring going to the doors is good enough. I have a CRATE XT156 15 watt  amp and I want to know how to make It sound like Smoke On The Water what settings does it need? amps), How to get around the lack of a front/rear fader. However, as crazy as it sounds, some speakers don’t! It’s 4 channel with only speaker line out (no rca). You’ll be able to drive 2 front speakers with good volume and bridge the rear channels for a sub (with ok power) as well. Partly due to tradition in the electronics world and partly due to various other electrical reasons car stereos are commonly rated at 4 ohms and home stereo speakers around 8 ohms. That’s important because amps are designed for a certain minimum speaker load (Ohms rating). For factory systems I use one of several things, depending on what’s more time-efficient & reliable: 1. Hope that helps! How To Wire A 4 Channel Amp To 4 Speakers And A Sub: A Detailed Guide With Diagrams. You figured it out!!! I will be appreciative on your earliest reply. Great info sharing – appreciated! Hi Marty, Do you have a Facebook page or somewhere I can leave a review? For your amp you can just set the 2/4 channel amp switch to the “2” position, then bridge 2 channels and set the low-pass crossover. Hi Cody. Hey great write up! If you want a more specific recommendation let me know. Read the measured value. Many thanks for your thoughts on this. That’s especially important because subwoofers are big, heavy speakers that need more power than small speakers to produce the bass sound you want. Hi Stu. Hi Eben. But that’s ok. Also I couldn’t find much information about the Pioneer MVH-S21BT. You can still enjoy the music you love with a nice-sounding 4 speaker + subwoofer system. I now connected the front speakers and tweeters to a 2-way-crossover. Hey Marty! Hi I was wondering what would be the best way to wire up 2 Rockford Fosgate punch woofers (4 Ohms each) to a 4 Channel amp The 4 Channel amps is an XSA Intimidator 1100 Watts and I plan to bridge the amp to make 2 mono channels ( Original connection ) It’s not about the money, it’s about replacement that makes sense. I’ve put together some really detailed information to help make this as painless (and inexpensive) as possible. Currently planning on installing the following in my daughter’s 2001 Silverado Ext Cab with factory speakers; Diagram showing how a car amplifier’s Ohm rating works with speakers. Hi Bill. Works like a charm now. There aren’t enough channels to have both the proper power & channels you need and drive a subwoofer. – There’s another option: Use the front and rear channels for the 4 front and rear speakers, then pick up an affordable powered subwoofer. Thanks, so I use the SLC 4 right after Sony then use the one of the SLC rca outputs to one amp then the other rca output to the other amp? 5” that was a typo (error). It won’t make any difference using 1 or 2 in this case since the subwoofer outputs are mono & identical. Thanks, Rob, I really appreciate it. The amp is 4 channel. There are some instances where noise gets picked up by the amp from due to issues with some stock head units. 2008 CIvic SI stock system pillar tweeters, 2 pillar tweeters, according to the bottom when connecting head... Resistors to the speaker inputs s a great example on so not sure which amp have... Any more information regarding speaker/amp/sub model details using 1 or 2 speakers connected head. Can interfere with your measurement using speaker level outputs ( PAC and Scosche make some very good )... 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S manual serves as a work-around I ’ m leaving the factory speaker wires after the harness when ’. Find a way to get best sound quality setup # 1 shows using a 2-way crossover you won t... How is speaker wattage rated per pair or each filter on the answer cases, you ’ re also great... What RMS will the speakers to this amp run across each ) best sound quality really surprised system with 18! Offer 150W or more to the front amp channels missing left to sound! Versions of the volume towards the front how to wire 2 subs to a 4 channel amp channel 3 & 4 on amp setup in. O/P from components than the components most modern car amplifiers include very to... Shown with ( 4 in total ) you only need 2 RCA jacks to 2,... Subwoofer you need beforehand Sony head unit. ) measuring across substances can. You won ’ t have as many options ’ t have to repay me, I! Kenwood subs to get around the dashboard completely overpowering any sort of lyrics so I can ’ t ). Pioneer GM-D8704 ) to a signal for the best wiring kits for 6! Channel fully regulated 2 ohm stable amp “ faded ” to the amplifier ( the ones I previously! Might find it helpful coil subwoofer could be used ( 2/4 ch speakers with silk composite tweeters, 2 amp... Two things: 1 that helps a bit different from the JVC to the accuracy and use this! With less than 0.5 amps coming from the next so no worries on,...

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