Question about Yamaha P4500 Power Amplifier 2-Channel

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Yamaha P4500 Power Amplifier 2-Channel Bridge mode

Hi Can you tell me if this amp will run in bridge mode at 4Ohms or will it only support 8Ohms loads whilst in bridged mode. I know it will support loads of 4 Ohms in stero mode but I would like to run a single sub woofer rated at 4 Ohms in bridged mode, giving me the full power from the system. Thanks in advance Mike Hackett

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Im from Yamaha service before and i know this model can handle as low as 2ohms per channel. I have to check on my manuals though if bridged. i dont see any reason why it cant. and it has a bridge option input stage... let me get back to you again in the days to come.

or email me redrivera0314@tyahoo.com

i have a service manual to check on this. got to dig on my closets..

Posted on Mar 19, 2008

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Hi I don´t speak a good English, but I think what the first is use the link of NOGGIN give you and wiew all specification of you amplifier, and when you are sure conect the woofer, So I think what the conection of that woofer (YES) is posible in Bridge mode is important the Value in Watts ofered by the woofer and the power output ofered in Bridge mode by the power amplifier don´t loose of your mind that!!

Posted on Apr 13, 2007

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Here is the link for the manual if you need this; http://www.americanmusical.com/manuals/yamaha/pseries_manual.pdf Page 4 of the manual (page 6 pdf) says no. 8 Ohms only in bridge mode. I think the way you could do this is to try parallel mode with the woofer on one of the outputs - not going to give you the best channel separation, but should handle it. Hope this helps :)

Posted on Mar 14, 2007

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1 Answer

Wiring a crossfire vr602 at 4ohm


OK what you are saying now is that your speakers are dual voice coil; models? 4 Ohms per Coil? I have always used single 4 Ohm Voice ciol speakers since amps are mostly based on 4 Ohm outputs. but you can get 8 Ohm dual voice coil subs also. With 8 Ohms per coil you can get 4 Ohms if you parallel the wires. What is best for you and will get you the most stable power and still will be in the specs of that amp is to run the amp in BRIDGED MODE running each subs voice coils in series with each other then run those 2 subs in parallel to the amplifier giving it a 4 Ohm load. So, your will have two sets of wires from your amp 1 for each speaker. Then you will take a short piece of wire that will connect the + to the - of each voice coil then hook up the wires from your amp to each sub What it will be is 4 Ohms + 4 Ohms = 8 Ohms per speaker the 8 Ohms in parallel each speaker to the Bridged amp output using just the + from one channel and the - from the other will give you a total of 4 ohms and power out put of 600 Watts so that ends up being 150 watts per voice coil or 300 watts each speaker
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1 Answer

Speaker daisy chaining , am I going to damage my amp etc.?


The Peavey CS4080HZ is intended to place 2,040 watts
per channel into four-Ohm-rated speaker
impedances. The "HZ" suffix is intended
to state the amplifier has a relatively high
impedance output and is optimized for no
lower than four-Ohm loads. Are you strapping in Bridged or Stereo Mode? Bridged Mono Operation
Both amplifier channels can be bridged together to make a very powerful single-channel monaural amplifier. Use
extreme caution when operating in the bridged mode; potentially lethal voltage may be present at the output
terminals. To bridge the amplifier, depress the rear panel Bridge switch to the IN position. Direct the signal to channel
A's input and connect the speakers across the hot outputs (the "+" binding posts) of channels A and B. Only channel
A's input attenuator is active while in Bridge Mono mode. Both connectors are strapped together, so either connector
can be used with a patch cable to drive the input of another amplifier.
Unlike the stereo mode, in which one side of each output is at ground, both sides are hot in bridged mode. Channel A's
side is the same polarity as its input with the minimum nominal load impedance being 4 ohms (equivalent to driving
both channels at 2 ohms) in bridged mode. Driving bridged loads of less than 4 ohms will activate the DDT
circuitry, resulting in a loss of power, and may also cause a thermal (overheating) overload.
Therefore, check the impedance of the cabs for each mode. Remember, if you connect two individual speakers in Parallel (+ to + and - to -) you cut the impedance in half. Two 8 ohm speakers in parallel now have a load of 4 ohms. Series connection + to - to + to -, will double the impedance. Two 8 ohm speakers will have a load of 16 ohms.
I have actually taken a two speaker cab with a 4 ohm impedance and opened up the back to re-do the wiring. I rechecked the impedance with a ohm meter. So yes, be careful. Whatever you do, keep the speaker lengths as short as possible. Buy really good speaker wire or if you make your own, go with 10 gauge wire.

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PYLE PT2001X 3300 Watt Professional DJ Power.just had question about running this amp in bridged mode 4 ohms, here's some amp info 3300 watts total power bridged in 1 ch only.1650 each ch in stereo mode...


Hi,

In bridge mode the minimum load will be 8 Ohm.
If you are using 4 Ohm speakers, it will mean you will give each side of the amplifier a 2 Ohm load.
Thats to much for this model.

Kind regards,
Gerard

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1 Answer

How can i bridge a mtx 9500 using a mono amp?


You cant bridge it to the MONO AMP . You can only bridge subs & speakers to 2 CH & 4 CH AMPS that are bridgeable. Because if it appears that there is 2 channels on a Mono amp its so its convenient for you to hook up 2 4ohm subs to it easily But both channels are actually connect internally together in parallel inside the amp unlike a 2 channel they are separate.

So just connect your mtx 9500 to a plus and a minus and doesnt matter which since all the + terminals of are connected together and - are connected together already.

Whats important is on the side of the sub/box it reads 2 ohms. The lower the ohms the more power the Mono amp will put out. Mono amps are designed to handle 2ohm loads.

If it reads 4ohms The MONO amp is the wrong amp to use cause the power will be weaker. So if you have a 1000 Watt Mono amp at 4ohms the sub will only get 500 WATTS Max while a 2 ohm will get the full 1000 Watts.

If it reads 4 ohms connect it to a 2CHANNEL AMP and BRIDGE IT (connect + of the sub to 1st channels positive of the amp then connect - of the sub to 2nd channels negative of the amp) . The power will be doubled when you bridge it on a 2 channel amp. NOW if it was a 2 ohm sub and you bridged it to the 2 channel amp it will fry the subs and ruin the amp. 2 CHANNELS CANT TAKE A 2OHM LOAD BRIDGED OK.

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1 Answer

I have a PHOENIX GOLD RYVAL V1502 amplifier and trying to hook it up at 2 ohms as it describes it can be 450watts x2 at 2 ohms running wires from bridged positive and negative to the first sub then two...


Hello mgonzalez390,

It sounds like the amp/subs impedance is not matched. According to the published specifications for the V1502 amp, it is only stable in bridged mode down to 4ohms, not 2ohms. You need to get the final impedance that the amp sees up to at least 4ohms or it will continue to shut down and eventually fail completely.

If your subs are dual voice coil and can be rewired so that each sub has an impedance of 8ohms, then you can safely parallel them to the amp like you have described. If they are single 4ohm voice coils, then you have 2 choices. Connect one sub to each channel or if you want to bridge the channels, then wire the subs in series, not in parallel. Wire the positive bridged terminal from the amp to the first sub positive, connect a jumper from the negative of that sub to positive on the other sub, and then the negative from that sub back to the negative bridged terminal on the amp. This wiring results in an 8ohm load to the amp and it should work OK without shutting down. But the power to each sub will actually be less than if you wire them separately to each channel.

Hope this helps.

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1 Answer

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Hello juan_penaloz,

The Kicker L7 has an RMS power range of from 50-750 watts and a maximum power handling capability of 1,500 watts so your Sony amp will power it OK. A more powerful monoblock like the Alpine MRP-M1000 or the Kicker 08ZX750.1 would provide even more power and could operate safely at 2ohms.

You have the voice coils wired properly for the Sony amp. It's OK to have the sub impedance higher, but you definitely do not want it lower than the 4ohms the amp is rated at in bridged mode.

Hope this helps.

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2 Answers

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asuming the 8s are 4ohms each; wire two in series and that gives you 8ohms then two more in series then you put those together in parallel and it gives you a 4ohm load. repeat with other four for the other side. you should then be able to bridge the sub


series; posative of one speaker to negative of other speaker and that doubles your ohms

parallel; posative to posative negative to negative and that cuts the ohms in half

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1 Answer

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the speakers most not go lower than 2ohms.when the amp. is bridge you are connectin 2 channels.your speakers are most important,the impendence of it,in ohms e.g 4ohms or 8ohms.note make shore the amp.can go down to 2ohms when bridge,or connect the speakers in series.if you not shore.

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