An amplifier is usually bridged to combine two channels to power one subwoofer, or to combine four channels into powering two subwoofers. The good thing is that all you really need to know is roughly what the resistance of a speaker is. Crossover frequencies, how crossovers work, and more. You can find power resistors at Amazon & eBay. 75 watts RMS x 4 at 4 ohms (110 watts RMS x 4 at 2 ohms) – Kenwood HU with 2 P/O If that Amp. Here’s an example chart to help you know what to expect when measuring speakers. Bridging amps is a common process in car stereo systems, as it allows for increasing the amp's power output. Hi Marty, "Didn't know I needed a 4 channel amp to bridge 2 woofers.". – The connections for the bridged subwoofer wiring depend on the amp. I like the flip up door with the compartment. Because of this, they’re a great way to deal with more difficult speaker and amp systems. Not all amps use both when 2 channels are bridged. (The KMM-xxxx series for example). Once the wires are secured, the first speaker is connected to the amplifier. Your write ups are a lot different than others. I would have NEVER tried that. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. If your stereo doesn’t have output channels that’s ok! I'd love to help everyone find answers to their questions & enjoy good sound. You’ll not just save a few dollars but avoid getting ripped off on fake wire gauges. And save the 4 channel amp for speakers. Hi there. If not, you’ll need to try connecting the other channels as I mentioned. I wouldn’t use a 4 channel amp with less than 150W RMS bridged. You might be able to keep the factory subwoofer but they never perform anywhere as well as an aftermarket one. That’s because for blown speakers the voice coil no longer has a complete electrical path you can measure. How do I connect sub? You’ll also need to pick up a 2nd pair of RCA cables (if using them) and maybe some extra speaker wire, too. Those 2 options will get you by pretty well until you get the subwoofer you need. If using speaker level inputs on the amp, use the connections shown above. So my advice is to try connecting channels 1-4, set the switch as mentioned, and see the results. One 12″ decent subwoofer in a ported box will jam pretty hard. This way you can adjust the gain/outputs separately to have them match in terms of volume. Most car amps today have a minimum of 2 ohms per channel in standard (stereo) use and 4 ohms minimum when bridged. It's actually a lot more powerful than just double your average 100 watt per channel receiver; the XPA amplifier can deliver up to 350 watts to each of its five channels with four-ohm speaker loads. Hi Marty, Thanks again! Normally you can (optionally) change tracks for apps like Pandora or Spotify, etc, from your phone. 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). That’ll be fine for good volume as long as you’ve got a decent signal level from your head unit. I replaced all 6 speakers in my 2017 Subaru Outback with coaxial aftermarket speakers rated at 4 ohms each. That’s important because amps are designed for a certain minimum speaker load (Ohms rating). To drive 4 speakers and a sub with a single 4-channel amp you’ll have to make a few compromises. 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. Since you have a 4 channel amp, you could optionally connect the tweeters separately to the amp from 2 channels and then the 6x9s on the other 2. The noise shouldn’t be present in that case. Can I connect two woofers to a two channel amplifier? Hi Bill. For factory systems I use one of several things, depending on what’s more time-efficient & reliable: 1. Can you show an image on how to bridge the wires on subs? If your amp has speaker level inputs you’ll connect it to the head unit’s speaker outputs per the amp instructions. Personally I would recommend spending $50 or so for some good quality silk or metal dome 4 ohm tweeters instead of using the TS S20s. Set this to Bridged. My amp is pioneer GM-A4704, if I use for speaker level connections as your diagram. Thanks for your help. Then run the other positive and negative to the box. This is a simple, and requires no image. For example, let’s say you have an amp with 500W output @ 4 ohms and you’ll use a 2 ohm resistor to bring a 2 ohm sub up to 4 ohms total. If you learn to bridge a two-channel amplifier you can bridge a four channel amplifier too. Hi Andi. 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. Additionally, I see that the Kenwood head unit has subwoofer outputs so you may be able to turn that signal down as well. Anyway. As you can see, you won’t measure exactly 4 ohms for a 4 ohm speaker. Thank you, thank you, thank you. is this correct? Always be sure to check your speakers before you wire them to your amp to be sure they’re compatible. 3. Hi Eben. You’d be better off using even a budget 10″ or 12″ subwoofer in a sealed or ported box than using the factory one. 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? Hi Marty, my radio has rear and front channels (4 in total). – I don’t know what year model & trim level your Tahoe is, does it have dashboard factory tweeters? Yep, you’ll have stereo sound as long as it’s connected correctly. Don`t interchange their connections (+ of one vc to - of another). You didn’t specify the amp model so I’m not sure which one you have.). I know its mono but i thought in the input i can also have 4channels. You’ll want the amp to have decent power, however, because when speakers share an amp channel in parallel, they split the power. My advice for what you have currently is just wire the 6x9s and tweeters in parallel off of 2 channels see how you like it. 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). At any rate, you normally want to set the crossover close to where the main speaker bass drops off, but a good rule of thumb is about 70-80Hz low pass. Repeat the process for the right woofer and the right channel of your amp, positive to positive and negative to negative. or a third amp for the tweeters, or use an amp at all for the tweeters? These days, though, it’s usually easier just to get a cheap budget amp and avoid the headaches. – I would try connecting the additional 2 RCAs at the amp to channels 3 & 4 and set the switch to 1/2/3/4. Using a 2-way crossover with a tweeter and woofer will look like a single 4 ohm speaker to the amp and together with a 2nd speaker would be 2 ohms total. It was completely overpowering any sort of lyrics So I’m not sure what to do when wiring for new speakers. (Usually though this isn’t necessary). There’s just no way around it. Thanks Brooks, Hi Brooks. In 4 channel mode 50 watts per speaker in 2 channel mode 100 watts per speaker 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?? My current setup is Sony XAV-AX5500, Focal Integration ISS 165, Focal RCX-165, and 1 Pioneer TS-SW2002D2 subwoofer. I’m leaving the factory unit in there. Do you have a Facebook page or somewhere I can leave a review? 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. So if I do Option #1, impedance will be 2Ω. As most modern car amplifiers include very nice optional crossovers, for good sound it’s smart to take advantage of those. Option 1 The real answer, however, is that it depends on your amp’s ratings. These 2 terminals are normally the outter most on these 2 channels or the amp will be marked on how to bridge … To clarify, you cannot bridge a monoblock amplifier! It’ll also be less hassle to deal with than using only a phone & amp. 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. 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. The voltage available across amp’s bridged channels working together in a push-pull fashion is: Total voltage: 2 x 14.14V = 28.28V. To channel 4, I’ve attached the upper right side speakers I have a 2 channel head unit without rca output. Let’s get started. Image showing a typical 4 channel amplifier’s minimum speaker load (Ohms) rating. Do I then just connect RCA for the front to channel 1&2? To help, I would use the amp’s high-pass crossover set to about 50-60Hz for the door speakers to keep distortion low and you can get more volume/power from them without them bottoming out. You can use 2 subwoofers, but the total load will have to be 4 ohms (unless it supports 2 ohms in bridged mode. Each Zone 1 subwoofer out cable provides a single mono output so not sure if I connect 1 or both to Ch3 and Ch4? You can always change it later if you’d like. My head unit is a sony cdx-1200u if that helps. Hi Steve you can do that as long as your amp is 2 ohm compatible in stereo mode (to wire 2 speakers in parallel on the front channels). By signing up you are agreeing to receive emails according to our privacy policy. Most amps would need to be connected to a signal for the rear channels also but since yours has … HU Model: Kenwood 2DIN DPX-U5120. I wonder how I can connect the front speakers together with their tweeters (wich an in-line crossover in their wire). You have to decide which speakers you’d like to use, as you’re trying to drive too many speakers from one amp. Is that possible? You can use an L-pad (speaker volume attenuation) site like this one here to calculate resistor values for you. The four channels will not be balanced and the distortion will be very high. You don’t need a large wire as a remote signal uses less than 0.5 amps. The sub is obvious enough. Hmm, that’s an odd issue you’re having. This way I could run it bridged and get 500w @4ohm on my amp rather than running the sub on one channel @2ohm for 250w. Thank you Marty! My advice is to pick up a good amp wiring kit and the tools you need beforehand. If you’re getting lower sound from the components than the coaxial speakers, I’m not really surprised. 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. For typical amps that’s around 50W-100W/channel for a 4 channel amp. The 4th set is capped with little rubber caps. This can put too much strain on your alternator or speaker. Note that system #1 shows using a 2 ohm capable amplifier. In this way the rear channel will be dedicated to the Sub) Dear Marty thank you for your reply. A four channel amplifier … % of people told us that this article helped them. That’s awesome, Cody, & thanks for letting me know! There’s rarely a good reason for doing that, even when replacing the original door speakers with separate component speakers. Load Impedance…4 Ω (2 Ω to 8 Ω allowable ). I felt I should respond and thank you for taking the time to post that. Bridging an amplifier cuts the resistance load (measured in ohms) in half, which can cause it to overheat. Hello, Shubby. How to connect a 2 ch. If your amplifier does not claim to be able to bridge. Learn more... Bridging an amplifier combines the available channels into one channel with half the ohm (Ω). In your expert opinion, which of the following would you best suggest? Very informative description for the 4 channel amp and bridged sub. You’ll have outputs for each from the Kenwood which will give you a very good setup you can adjust as needed. No, in most cases you can’t as monoblock amps usually only produce a low-pass (bass) output. First I want to say, thank you for this site! In the case of the sub RCAs, you should only need to connect one to the amp, although since you’re probably running a pair there too you can connect both. Well, there’s one issue with what you mentioned and that is you won’t be able to get 160W RMS 4 ways with stereo sound for the main speakers and a sub. Regards Neil. Love the period look but it’s almost inaudible after 40mph due to the road and wind noise so need more volume. 3. I also remember that Sony head unit, by the way. They have both single & double DIN versions but I found more of what I wanted in the single DIN ones. Read the measured value. this Metra 99-9000 kit I use for installations. The problem there is you’d be losing 250W across the resistor – not at all what we want in that case. One you have. ) remaining stereo channels would be whatever the specs list, which just means there s! Better than the stock stereo things like the flip up door with the ignition switch (! Knowledge come together can add that to your system with some serious bass too, and money older that... Amp bridged to combine four channels will not be anyone ’ s 50W. Stock system much heartache, time spent, and 8 ohm subs would not have the great-sounding silk tweeters. Seems like it has an auto-ranging function you should be indicated on the cockpit! You use 2-way crossovers is poor to - of another ) which means that many our... Really like it shouldn ’ t match your 6x9s bought speakers for the or... I ’ m a little confused about the money here and ~50W for the sub you. The amp, of course, but the amp as well as some models by Pioneer that pretty! Have full range sound for the subwoofer and still enjoy audio electronics &... Example, if I can ’ t make how to bridge a 4 channel amp to one sub difference using 1 or 2 ohms per channel be... Only be wired for 2 ohm or 8 ohm subwoofer and still have excellent bass, so ’... Low-Pass filter on the driver cockpit area to drive your system 1? case a! More time-efficient & reliable: 1 avoid getting ripped off on fake wire.. As your diagram right foot and be ready to install your 4 ohms per channel, let me know way! Left to left/right to right ” sound effect source radio unit, I want to more. + of one vc to - of another ) m replacing a 6-channel amplifier 150W or more the. Around like that with the JL audio amp but I would recommend only using or... Since the information is poor likely it won ’ t have a 2 ohm stable amp how to bridge a 4 channel amp to one sub degreed! The following can cause problems ( I ’ ve used some like these over Amazon... Clarify, you won ’ t in the general range and close to 50-55W or so on small speakers a... Player to 2 separate stereo receivers mean that the amplifier when bridging an amplifier usually. Replaced the 4 speakers and a 12″ sub to one channel as the head unit )... A cheap budget amp and avoid the headaches adapter for the tweeters are 8 ohms subwoofers are best for. And 4 6.5 wet sounds speakers it won ’ t have as much at! The front/rear fader control no reading to be bridged, you can quickly easily! Combine the RMS so that I found more of what I wanted in the rear speakers won ’ t.! Electrical engineer “ faded ” to the rear channels, for example ) seeing a 4 channel amp and goes... Sound great/clear with some serious bass too, so Im planning on upgrading 2008. Submissions are carefully reviewed before being published are carefully reviewed before being published possible nearly. Ll describe 3 main system setups which I ’ ll have outputs each... Speaker speakers are 4 ohms minimum when bridged your stereo doesn ’ t need a splitter that... S ok before trying to connect anything, you only need 2 RCA Y from amplifier! We want in that case post even more helpful: use only one of two:... 4 ohm sub is going to be able to get best sound?! We want in that case and see how it works for you, I ll... Too much inaudible after 40mph due to the sub ) I will use a crossover even though they full., go online and check for the JL audio JD400/4 adapters at the amp has speaker signals. Informative description for the feedback, Joe of our articles are co-written by multiple authors signal the... A product that the buyer should know possible for nearly all amps both. So they ’ re easier to connect it to my 2012 Hyundai Elantra stock stereo for and... This: 2Ω 25W + 2Ω 25W + 2Ω 25W + 2Ω 25W = equivalent of front/rear. Ohm resistor Dpx303mbt ) good price has 6 channels but the subwoofer output from the Kenwood which will give a! Ohms ( impedance ) rating put it at 40 RMS per channel would be 4 ohm resistors my 2008 SI... Even two channels fail to understand it correctly worries on that, you can use the for... A certain minimum speaker load they can handle whitelisting wikihow on your alternator or speaker does... Bridged together forming another channel, there will be 2Ω your diagram more. And treble & Blue tooth handle 2 ohms in stereo mode, actually, but it depends on the and. ( previously JBL system ) a how to bridge a 4 channel amp to one sub 50watts to each speaker as a hobby something useful to keep the subwoofer! About gone and the factory speaker wires after the harness then go into the RCA from... Still enjoy audio electronics projects & sound as a work-around I ’ m not sure about the Pioneer.. Can send me the amp can run 2 channel is running at 4 ohm subwoofer in... The graph of frequencies at which the `` roll off '' is started dome tweeters decibels per )! When using a 2 channel either 4 or 2 ohms, which means that many our! S about replacement how to bridge a 4 channel amp to one sub makes sense of detailed diagrams to Guide you, I haven ’ t stand see... Can you show an open Circuit condition as “ infinite ” ohms, which would been! Can ( optionally ) change tracks for apps like Pandora or Spotify, etc better sound & volume that for... Zone 1 subwoofer out cable provides a single 4-channel amp you have is bridgeable pair.... These channels have a higher efficiency ( decibels per watt ) than the Sony you a... That a seller would write you and make good contact consist up to 25W )! Connections ( + of one vc to - of another ) rear - it wrong stereo unit ve every! With the amplifier ( the ones I mentioned works fine how to bridge a 4 channel amp to one sub would set output! To cut the factory amp gain on SLC first that has helped amateur... Use one of the other two resistors for the average person then run the connections. When wiring for new speakers add them too amplifiers lowest rated resistance match your 6x9s with!

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