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. You’ll then use the low-pass filter on the Coustic amp if it has one. That’s because for blown speakers the voice coil no longer has a complete electrical path you can measure. Left ront & rear speakers in parallel to the ch. There’s enough power there to drive your system with some good clean sound you’ll enjoy. The good thing is that all you really need to know is roughly what the resistance of a speaker is. ( Original connection ) Can I combine two channel amplifiers and bridge them to combine the RMS so that I get more wattage? I’ve used some like these over at Amazon. If there’s something I misunderstood or more info you have, just let me know. The 8 ohm subs aren’t optimal but will get you by for now until you are ready to swap them for something decent in a 4Ω model. If it were me and you don’t mind a little bit more effort, I’d use the front channels of the amp on the front speakers in the vehicle. I cover this (general) topic here: Crossover frequencies, how crossovers work, and more. :). If you’re wanting to install a 4 channel amp for 4 speakers and a subwoofer but only have 2 stereo channels available, that’s ok. As shown in my diagram, you can connect 2 channels to a 4 channel amp using either the speaker level inputs wired in parallel or by using RCA “Y” adapter cables. Make sure that your amp is bridgeable otherwise even two channels bridged can cause excessive current and high heat. – There’s another option: Use the front and rear channels for the 4 front and rear speakers, then pick up an affordable powered subwoofer. Then the same for the right channels. Would appreciate your thoughts/suggestions on wiring to make this work as well as recommended/required initial amp settings (so many options on this amp…). Can I connect one dual-coil speaker to a four-channel amplifier? 3. 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. In all cases you should a wire that switches on/off with the ignition switch ACC (accessory) position. I like my 1989 vintage car audio, and it currently sounds great, but I was interested in adding two more speakers to a 2 channel amp. Don’t do it! You would use system example #1 in the diagram above. A a great (but affordable) amp wiring kit like this Belva 8-gauge complete kit includes not just the basics but a lot more. Hello, Marwin! I really appreciate your expert opinion. Hello Manny. Hi Neil. Yep, you’ll have stereo sound as long as it’s connected correctly. 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. Also, it doesn’t really make sense given you have other options. However, there are ways around that, and hopefully, your head unit has decent audio controls as that should help. Connect the ch. Good morning, Doug. The amp output to FL, FR, RL, RR. There are plenty of detailed diagrams to guide you, too. is this correct? If your amplifier is able to do that, you can bridge the two in each pair together. Hi there. 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. 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. Too much sound is coming from Co-axial. If connected properly the issue should be eliminated. Old coustic 2 channel amp to a speaker box in the trunk,it’s a box with 2 -10” Speakers with tweeters I want to use as a (sub) so to speak. :), Question when installing a 4 channel amp are u connecting the amp to the speakers at the door or to the harness that plugs in the radio. They’re fairly small now, too, so they’re easier to install as well. Unfortunately there’s some trial and error involved since the information is poor. Your analysis was on point. The RMS rating is what you should go by. But I want to know if it will damage the amp or the active subwoofer. Will this be fine? Does this mean that the amplifier supports 4Ω and 2Ω connection? Hi Andi. If using speaker level inputs on the amp, use the connections shown above. Wire each sub's coils in series ... wire one pos and one neg together on each sub. The volume and other adjustments can be often be made from the phone or the head unit, but it depends on the unit and what media source you’re using too. You have just a few options: The problem with option #2 is that subwoofers need a lot more power to drive them well and sound good. The subwoofer have rca red and white. An amp with built-in Bluetooth receiver will be better (Rockville and some other brands have some good ones that can run your whole system). The Pioneer’s internal circuitry scales down the speaker level signals to line level. – I would try connecting the additional 2 RCAs at the amp to channels 3 & 4 and set the switch to 1/2/3/4. You would wire it according to the factory wiring colors (you can usually find these online) and match them to the amp’s speaker wiring labels. 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. For example, if your amplifier says that it can handle 2 Ohms, wire it so it produces 4 Ohms. My advice is to pick up a good amp wiring kit and the tools you need beforehand. Is FAI-3a the same as the SLC? Power resistors are larger versions of the resistors used in many electronic products. Likely they need more power to drive them than the coaxials, that’s why. 1 & ch. Remember: 4 ohm mono is equivalent to 2 Ohm stereo. Hi Marty, my radio has rear and front channels (4 in total). But after reconnecting there it is again. Does it work to test the ohms of the sub with a multimeter as you described in the article or is that a different beast? 3 & 4. Don`t interchange their connections (+ of one vc to - of another). Always be sure to check to be sure. Bridge 2 channels to one of the subs and then 1 channel to each of your other subs, otherwise you have to merge all of your channels then split them which could be harmful to your amp. Unlike their smaller siblings, they’re designed to be able to handle a large amount of heat. Left channel to front left, rear left. I tried disconnecting the input signal from the amp and it goes away. I have a Pioneer GM D8604 amp, a pair of 6×9’s TS 6965v3 (450w peak) and a pair of TS S20 Pioneer Tweeters (200w peak). Hi Stu. So if I do Option #1, impedance will be 2Ω. The good thing is you’ll be fine with your amp. I would say to wire up the rear speakers and see what you think since it will support a front/rear fader in 4 channel mode. some of the best wiring kits for the money here. Today’s head units offer Bluetooth, music app controls, EQ functions, and much, much more for under $100. Tap off of a +12V accessory/switched wire behind the head unit or cigarette lighter socket (if switched with the ignition). Would really like it to sound great/clear with some serious bass too, and would spend a little more to achieve this. I have utilized the speaker level input. We can use 1 large resistor for each speaker as a work-around for this. As I explained in the article, that allows us to keep the speaker load at 4 ohms total when using 2 speakers in parallel. 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. Basically paralleling the RCA inputs like speaker output. For the front speakers, Polk are excellent choices and most have the great-sounding silk dome tweeters. The following diagrams are the most popular wiring configurations when using Dual Voice Coil woofers. There is nothing you can do to that amp to get it to put out 300W at 4 ohms. I’m very glad fast response from you. :), So Im planning on upgrading my 2008 CIvic SI stock system. Your write ups are very informative. In order to verify it’s coming from the head unit, you can optionally use an RCA to 3.5mm cable to connect audio from your phone’s headphone jack and play some music through the amp. An amp wiring kit like this one will make your life easier! Treat the voice coil's terminals as they're marked, + as +, - as -. I may replace the factory amp with the JL Audio JD400/4. Thanks for your help. Hey Marty! That being said, don’t worry too much! They don’t add much excitement to the system. I’m still using the factory head unit (Fujitsu Ten, no Harmon Kardon). Im opposed to only running one coil on a DVC sub. 2. Use a fuse tap adapter to connect a +12V if the fusebox is fairly easy to access. Otherwise, set it to the lowest setting like the 10 Ohms or 200 Ohms range, etc. If I consider doing Option #1, will it be fine considering all my speakers are rated 4Ω. wikiHow is where trusted research and expert knowledge come together. 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. Bluetooth amps are better for motorcycles, boats, and so on where you don’t have as many options. 2. Right channel to front right, rear right. Run the speakers in parallel on channel 1&2 and bridge channel 3&4 to power the sub. An amplifier is usually bridged to combine two channels to power one subwoofer, or to combine four channels into powering two subwoofers. Then the front outputs to 1 & 2 as usual. And also I’m getting less sound o/p from Components than Co-axial. Gift card? There’s simply no way around it. Thank you sir. Because of this, they’re a great way to deal with more difficult speaker and amp systems. Because these kinds of amps can’t handle a 2 ohm load, it’s a bit harder and needs a different approach. I can’t stress enough how important it is to be ready to install your 4 channel amp. That should be enough in most cases: Not totally silent in the rear, but most of the volume towards the front speakers. ( Note: Speaker wire input and not RCA) My English is not so good. Things like the following can cause problems (I have seen this happen many times! How can I connect 2 woofers to a 4 channel amp? If you connect a speaker load below the amp’s minimum rating it can get hot and even become permanently damaged at some point. I urge you not to do it. Ah ok I didn’t know you weren’t in the USA. (The KMM-xxxx series for example). Very informative description for the 4 channel amp and bridged sub. Should I just delete the rear door speakers? Reading a previous answer: Brent, When bridging a 4-channel amp to 2-channel mode, you combine the front left and right channels to form one channel, let's call it the left speaker channel. I’d love to hear from you and make this post even more helpful. A four channel amplifier … You added a 4 ohm resistor to each 4 ohm speaker, then hooked them in parallel to get your 4 ohms. You don’t have to repay me, but I do appreciate that offer. It will depend on (1) the amp’s power output capacity and (2) what the amp’s gain is set to. They work great and look good. However, usually the bridged wiring is labeled on the amp itself. If that’s not available, yes I would try left channel – = subwoofer negative, and right channel + = subwoofer positive. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/6\/6b\/Bridge-an-Amplifier-Step-1-Version-2.jpg\/v4-460px-Bridge-an-Amplifier-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/6\/6b\/Bridge-an-Amplifier-Step-1-Version-2.jpg\/aid14973-v4-728px-Bridge-an-Amplifier-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"