Question about Jensen XA4150 Car Audio Amplifier

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MTXThunder 4501 There are 4 terminals on this amp 2 + 2 -. How do I bridge the amp, what combination of terminals do i use?

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Posted on Feb 05, 2008

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1 Answer

Bridging outputs on JBL BP300


Hello paulnkate,

The BP300.1 is a mono (1 channel) amp. You cannot bridge a mono amp. Bridging is a method of combining the outputs of 2 or more channels of a multichannel amp into a single mono load. On your amp you would connect a single sub to one of the +'s and one of the -'s (either one is OK, they are connected internally). The other pair of terminals is just for convenience, making it easier to connect, if you want to power 2 subs.

Hope this helps.

Jul 20, 2009 | JBL BP300.1 PowerValve Series Car Audio...

2 Answers

Ok . i have a pair of crossfire subwoofers, @


Your amplifier is 4 channel... and only 2 ohm stereo capable.

You will get the most power putting 1 subwoofer wired in parallel on each BRIDGED channel.

This will give you a 2 ohm stereo load.

Both + on 1 subwoofer to + terminal on amplifier bridged channel 1
Both - on 1 subwoofer to - terminal on amplifier bridged channel 1

Both + on 1 subwoofer to + terminal on amplifier bridged channel 2
Both - on 1 subwoofer to - terminal on amplifier bridged channel 2

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.


Jun 10, 2009 | DHD NTX-3102 Car Audio Amplifier

2 Answers

Two terminals? bridging theory?


Hello again jm129852,

Having two power and ground terminals allows you to run two smaller wires instead of one big one. It's a convenience. No, you do not have to use them both. They are connected together inside. Yes, you should still use a single fused battery lead. Connect the big wire and fuse holder to the battery and to a distribution block and run the smaller wires from the output side of the distribution block.

When you connect the outputs of a two channel amp to two separate speakers, each speaker gets the power produced by it's channel only. If you are using only one speaker, and the amp is rated to operate bridged, then the speaker will receive the power from both channels, typically twice as much. You do need to be careful when using bridged mode because many amps will only operate safely at a higher impedance when bridged. For example, when operated with both channels connected to separate speakers (not bridged), it may be stable to 2 ohms. But when you connect both channels together (bridged), it is only stable to 4 ohms. Usually, the specifications will tell you the lowest impedance at which the amp should be operated. The specifications for the current RF Punch 500.2 are like this: 125 watts X 2 at 4 ohms; 250 watts X 2 at 2 ohms; 500 watts X 1 bridged at 4 ohms (4 ohm stable in bridged mode). You would NOT want to connect two 4 ohm subs in parallel to this amp in bridged mode. It would result in a final 2 ohm load and the amp would overheat and fail. One 4 ohm sub would be OK, and it would receive the full 500 watts as stated in the specifications. You could connect four 4 ohm subs, two each in parallel to each channel, and the 2 ohm loads on each channel would be OK. Or you could series two of them together for an 8 ohm load, do the same with the other two, and then parallel the two 8 ohm loads for a final impedance of 4 ohms and connect them into the bridged terminals. With DVC subs the connection possibilities get more complex. There are many good impedance calculators online that can help you determine the best wiring solution for various amp/sub combinations. I like the one above at the12v.com web site. Rockford-Fosgate also has one which allow you to select the a number of subs (up to 4), their voice coil configuration (single or dual), and the voice coil impedance. The RF calculator then shows you what configurations are available and what your final load impedance will be.

Hope this helps.

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1 Answer

Need proper wiring details.


This is a dual 4 ohm sub. By wiring the terminals in series (one set of + to - from one side to the other) you will have an 8 ohm sub (most folks probably don't want this). By wiring in parallel (+ to + and - to - and connect the - wire to the - terminal on your amp and the + wire to the + terminal on your amp you'll have a 2 ohm sub.

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1 Answer

Can you bridge an adcom GFA-5802 power amp?


Running an amp in bridge mode requires a specific circuit design. It is not possible to combine 2 amps in this fashion.
Dan

Mar 02, 2009 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

Subwoofers


This will depend on the amplifiers capabilities.

I will give 2 different scenarios.

#1 Stereo configuration

If the amplifier supports an RMS power output close to the RMS input power of the subwoofers then run the amplifier in stereo mode. For example 150 watts RMS X 4 channels driven at 20-20khz. (If you can provide a model # for the subs and the amp your looking at I can help you further with this decision.

Wiring for this is easy and simply involves matching the connectors for 2 of the channels (Front or Rear) to each of the subwoofers.

#2 Mono Bridged mode.

If the amplifier is lower power but mono bridgable you can bridge two Pairs of channels and power each of the subwoofers this way.

Generally speaking a 2 channel bridgable amplifier will be able to at least combine the wattage of each channel into a single monural channel and in many cases its actually higher.

So you would bridge the front 2 channels into a single bridged mode for one subwoofer. and then you could bridge the read 2 channels into another bridged mono channel for your other sub woofer.

For example if you had bridgable amplifier thats 50 watts RMS X 4 you coudl very likely (Generalization based on quality of amplifier) send 150 watts RMS to each subwoofer.

Again I would need to know what amp you're refering to to provide specific wiring instructions. Many Bridging amplifiers either have a single switch that will send them to bridged mode or you would use the positive + terminal from one channel and the negative - terminal from the other channel or a combination of both.

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1 Answer

On lucent amps you sometimes have to bridge two terminals together to make it work. i need to know what two need to be bridged.


I'm not sure if Lucent has a special bridging procedure, but on most if not all other amps, when you bridge you DON'T connect two terminals together. What you do is instead of using the plus and minus terminals on one channel to one speaker and the other +/- terminals to the other speaker, you will instead use the plus (+) terminal from one channel and the minus (-) terminal from the other channel to drive one speaker and the remaining + and - terminals remain unconnected. Be sure you use the + and - terminals that are marked for bridging. Please note, that when you bridge that your speaker load DOUBLES to EACH channel. In other words, what your amp saw as a 4 ohm speaker going to one channel alone, it now sees as a 2 ohm speaker on each channel when bridged. Be sure you know what you are doing before you bridge and fry your amp. In my experience, if after bridging your amp works fine for about a month and then fries then you bridged wrong and ended up with the wrong speaker load on each of the bridged channels. Be careful. Amps cost a lot to repair. Good luck.

Jun 02, 2008 | Audio Players & Recorders

1 Answer

Car amp


if you are talking about speaker terminals i would have to know the model you are referring to. take a look at where the speakers hook up, you should have +-+- if it is bridgeable it will usually have markings below or above those that only show 1 + and 1 - ... connect your positive to the single specified and negative to the other specified... you may or may not be able to bridge it with a wire, without the amp model, i can not say for sure...

if you are talking about actual power connections, then yes you can bridge them, i have an old amp here that has 1 remote, 2 positives and a large negative.. i bridged the positives using 6 gauge wire and used a 2 gauge for the negative...

hope this helps,
trin

Nov 14, 2007 | Jensen XA92 Car Audio Amplifier

1 Answer

How to


First of all, make sure your amp is bridgeable. There are a few ways to bridge subs. series: hook one wire from the negative on the left amp output (or whichever is labeled on amp for bridged)to left sub negative. left sub positive to right sub negative, then right sub positive to the amp positive output.(like a big loop through both speakers) parallel: both speakers get their own set of wires, both negatives go to the bridge negative terminal, and both positives go to the positive bridge terminal. Series-parallel: A combination of the two. say two speakers in series, and one hooked up alone, but all to the same amp outputs. Bridging your amp/speakers basically lowers the resistance of the circuit and makes more current flow, more power, louder, harder hit. In series, it also makes both speakers do exactly the same thing, instead of "stereo sound" or L/R differences. What you're probably looking to do is Bridge in parallel. That will drop the resistance of the circuit the lowest, allow the amp to put out the most amount of current to the speakers, and allow your bass to hit the hardest. If your amp only has one output, hook up the same way as above. Just see what resistance your amp is stable down to. If down to 1 ohm, no worries. if stable only to 2 or 4 ohms, you may want to bridge in series to be safe. That will cause the resistance to go up, and will not pull as much current through the amp. The whole time, just remember Bridgeing and higher current mean HEAT so watch your amp. I hope this helped.

Oct 31, 2007 | Pioneer TS-W301R Car Subwoofer

2 Answers

My amplifier


If you're bridging the amplifier you can't use a speaker or speaker combination under 4 ohms. If you have 2 4-ohm subs, or a dual voice coil sub that you're trying to run with the bridged amp, that may be your problem. The screws aren't designed to come out of the holes; they're supposed to just loosen or tighten the terminals. A loose wire in a terminal won't cause a protect light on the amplifier unless the wire is shorting to another terminal or to the case of the amp.

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