Question about Pioneer PRS-X720 Car Audio Amplifier

The specs I read on the Pioneer site say the amp is not 1 ohm stable, so keep that in mind.

It partially depends on the impedance of each voice coil on the DVC subs. If they are dual 4 ohm, and you connect the DVCs in parallel ("+"s together, "-"s together), you could run a sub on each channel of the amp(s). This would put about 200W on each sub.

The other option is to still tie the dual 4 ohm voice coils in parallel, tie 2 subs in series (one "+" to the other "-"), and bridge the two channels of the amp (aka put them in parallel). But this, also, would be about 200W on each sub.

Things get different if the subs have dual 2 ohm, 3 ohm, or 8 ohm voice coils.

Posted on Mar 16, 2008

2 4 ohm speakers wired in series is 8 ohms and then is dropped back down to 4 ohms when you bridge it.

2 4 ohm speakers wired in parallel is 2 ohms then dropped down to 1 ohm when bridged

(most amplifiers will not handle loads below 2 ohms)

hope this info helps

2 4 ohm speakers wired in parallel is 2 ohms then dropped down to 1 ohm when bridged

(most amplifiers will not handle loads below 2 ohms)

hope this info helps

May 20, 2011 | Pyle Dryver PLAD213 Car Audio Amplifier

From the specs this amp can only handle 4ohms when bridged but can handle 2ohms when it's not bridged

**Specifications**

- Continuous Power (20Hz-20kHz, 0.04% THD)
- 2 ch: (4 Ohm) 100Wx2
- 2 ch: (2 Ohm) 200Wx2
- 1 ch: (4 Ohm) 400Wx1

- Maximum Power (EIAJ)
- 2 ch: (4 Ohm) 250Wx2
- 1 ch: (4 Ohm) 750Wx1

- Frequency Response: 10Hz - 50kHz (0,-1dB)
- Total Harmonic Distortion: <0.01% (1kHz, 4 Ohm)
- Signal-to-Noise Ratio: >105dB (IHF-A Weighted, at 1kHz)
- Dimensions: 10-3/8" x 2-1/2" x 13-5/8"

Nov 08, 2010 | Pioneer PRS-X720 Car Audio Amplifier

This could be the reason. If you look at the specs for this amp you will see that the continuous power out is rated for 380W bridged. The speakers rated at 450W should be able to handle close to 315W continuous. Now if you split these numbers being you have bridged these speakers, you drive each one up to about 190W continuous. The speakers are being driven approximately by 60% of the rated capability. I personally like to keep it right where you got it, not exceeding 80% of the speakers rated capacity.

Here are the specs for the AMP:

Specifications
Peak Music Power 760 Watts
Number of Channels 2
Load Impedance Capability 2~8 Ohm (Stereo), 4~8 Ohm (Bridged)
Continuous Power (4 ohm) 125W x 2
Continuous Power (2 ohm) 190W x 2
Continuous Power Bridged (4 ohm) 380W x 1
Frequency Response 10Hz ~ 50kHz
Total Harmonic Distortion 0.008%
Signal-to-Noise Ratio 100dB
Dimensions 12" x 2-3/8" x 12-3/4"
Features
Bridgeable
Channel # Capability 1/2/3
PWM Regulated MOSFET Power Supply
Screw-Type Speaker Terminals
Balanced Isolator Input Circuit
RCA Inputs 2 Channel
Input Level Control Hi-Volt (200mV ~ 6.5v)
Built-in Crossover Selectable LPF (80Hz, -12dB/Oct.)

Here are the specs for the AMP:

Aug 06, 2010 | Pioneer GM-5000T Car Audio Amplifier

I have the following specs for you

Basically 150watts per channel using two channels , or 75watts using all four

Here goes:

**Dimensions 12.25L x 9.25W x 2.10H**

Basically 150watts per channel using two channels , or 75watts using all four

Here goes:

**4 Channel Mosfet Amplifier****Advanced Overload and Thermal Protection****Metal Film Capacitors/Resistors In Signal Path****Frequency Response +/-1dB, 20Hz to 20 kHZ****Signal to Noise Ratio (A-weighted) >100dB****Max Continuous Bridged Power @ 1% THD 150 watts x 2 into 4 ohms @ 14.4 Vdc****Max Continuous Power per Channel @ 1% THD 75 watts x 4 into 2 ohms @ 14.4 Vdc****Nominal Continuous Power per Channel @ 1 % THD 35 Watts x 4 into 4 ohms @ 14.4 Vdc****IASCA/USAC Power Rating 12 Watts x 4 into 4 ohms @ 12.5 Vdc****Minimum Load when Bridged 2 Ohms****Minimum Load per Channel 1 Ohm****Input Signal Voltage Range 0.1 volts to 2 volts****Crossover Type Resisitor Network, Linkwitz Riley,****Highpass/Lowpass****Crossover Slope 24 dB per octave****Crossover Frequency Range 20-550Hz****Factory Crossover Setting 85 Hz****Auxilary Output Channels 2****Auxilary Output Frequency Range Highpass or Lowpass, Opposite of Speaker Output****Bass Boost 0- to +18dB @ 45 hZ****Power Supply Voltage 10Vdc to 15.5Vdc****Recommended Fuse 40 amp**

May 23, 2010 | Car Amplifiers

RMS Continuous Power (at 12.0V)

Per channel into 4 ohms...............40W, 0.08% THD

Per channel into 2 ohms ..............50W, 0.3% THD

Bridged into 4 ohms.....................100W, 0.3% THD

RMS Continuous Power (at 14.4V)

Per channel into 4 ohms...............60W, 0.08% THD

Per channel into 2 ohms...............80W, 0.3% THD

Bridged into 4 ohms.....................160W, 0.3% THD

Max. Power (at 14.4V)

Per channel into 4 Ohms..............120W

Bridged into 4 Ohms....................320W

This should help.

Per channel into 4 ohms...............40W, 0.08% THD

Per channel into 2 ohms ..............50W, 0.3% THD

Bridged into 4 ohms.....................100W, 0.3% THD

RMS Continuous Power (at 14.4V)

Per channel into 4 ohms...............60W, 0.08% THD

Per channel into 2 ohms...............80W, 0.3% THD

Bridged into 4 ohms.....................160W, 0.3% THD

Max. Power (at 14.4V)

Per channel into 4 Ohms..............120W

Bridged into 4 Ohms....................320W

This should help.

Apr 30, 2010 | Alpine MRV-F407 Car Audio Amplifier

Hello, your problem is that your amp is rated at 4 ohms bridged mono ans 2 ohms stereo. If your running it in stereo you need to raise the ohms to 2 ohms a channel and if your running it bridged into 1 channel you need to be running it at 4 ohms. Please rate this solution please so I can prgress on FixYa.com. Thanks!

Dec 18, 2009 | Car Amplifiers

You probably have the output bridged at 2 ohms. This amp is not a 2 ohm bridged stable amp. It is 2 ohm stable only in stereo. That means each channel can be 2 ohms, buts not bridged at 2 ohms.

If you have two 4 ohm speakers that are wired in parallel and then you bridge them, you have a 2 ohm load.

They only safe way to use two 4 ohm speakers is to run one speaker to each channel and then you have a stereo 4 ohm load.

When you use a 2 ohm load you get twice the current draw thru the amplifier as you would with a 4 ohm load. That means that the fuse you are using, the rating the amplifier is designed for, will blow any time you have a big bass hit.

If you are not using a 2 ohm bridged load, and you are using a 4 ohm bridged or something the amplifier is rated for, and you still have this problem, you may have a bad speaker. Even a speaker that will play can sometimes be on the brink of shorting out and causing the amplifier to draw lots more current than it is rated for.

If this is the case, you should go and get your speakers checked and see if they are still measuring at 4 ohms or at least close to it. Most speakers will measure a little lower than what the are rated. It is not unusual for a 4 ohm speaker to measure at 3.5 ohms, but if it is less than that, you problem is the speaker. Even if the speaker still plays.

I hope this was helpful for you, if you require any further help just ask.

If you did find that this was helpful in solving your problem, I would really appreciate a good rating.

Thanks and have a great day,

Dave

If you have two 4 ohm speakers that are wired in parallel and then you bridge them, you have a 2 ohm load.

They only safe way to use two 4 ohm speakers is to run one speaker to each channel and then you have a stereo 4 ohm load.

When you use a 2 ohm load you get twice the current draw thru the amplifier as you would with a 4 ohm load. That means that the fuse you are using, the rating the amplifier is designed for, will blow any time you have a big bass hit.

If you are not using a 2 ohm bridged load, and you are using a 4 ohm bridged or something the amplifier is rated for, and you still have this problem, you may have a bad speaker. Even a speaker that will play can sometimes be on the brink of shorting out and causing the amplifier to draw lots more current than it is rated for.

If this is the case, you should go and get your speakers checked and see if they are still measuring at 4 ohms or at least close to it. Most speakers will measure a little lower than what the are rated. It is not unusual for a 4 ohm speaker to measure at 3.5 ohms, but if it is less than that, you problem is the speaker. Even if the speaker still plays.

I hope this was helpful for you, if you require any further help just ask.

If you did find that this was helpful in solving your problem, I would really appreciate a good rating.

Thanks and have a great day,

Dave

Jun 19, 2008 | Sony Xplod XM-1652Z Car Audio Amplifier

If the subs are dual 4 ohm voice coils, you could hook the DVC's of each sub in parallel ("+"'s together, "-"'s together) making each sub essentially 2 ohms. Then connect one sub to each channel of the amps. This will put about 200W on each sub.

Mar 14, 2008 | Pioneer PRS-X720 Car Audio Amplifier

ASSUMING that the amp is OK with a 2ohm load then you "set it up" by the configuration of the speakers you use. Two 4 ohm speakers if parallel will give you a 2 ohm load. However, if you are bridging the ouputs then a single 4 ohm speaker bridged between the two outputs will put a 2 ohm load on each channel. Be very careful if you are bridging the outputs that you know what you are doing. On average, when bridged wrong (too much load) the amp will last about one month before it fries. Get some help if you are bridging. Be sure not sorry.

Jan 14, 2007 | MTX Thunder 801D Car Audio Amplifier

Sounds like you have overloaded your amp. When you bridge you MUST make sure that you still have the proper speaker load. One 4 ohm speaker on one channel is fine, but when you bridge that same 4 ohm speaker, it gives you a 2 ohm load on each of the two channels that are now bridged. If you made the mistake of wiring two 4 ohm speakers in parallel (plus to plus and minus to minus) then when you bridge you will be driving a one ohm load on each channel. This is very close to a dead short. Stop using your amp at once until you get your speaker load correct. This will damage your amp and it will cause you to have to go to a repair shop to fix it. DO NOT RUN YOUR AMP ANYMORE UNTIL YOU FIX THIS. Good luck.

Jan 22, 2007 | Kenwood KAC-9152D Car Audio Amplifier

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