Will running amp with 8 ohm load rob power?

[joshpoints 10+ year member]

one channel to each voice coil?

This is a good thought and I'm not sure if this is okay or not. I've only ran a dual voice coil sub on a single channel amp.

 

[amr952 10+ year member]

This is a good thought and I'm not sure if this is okay or not. I've only ran a dual voice coil sub on a single channel amp.

I am sure it will work just fine, you will want to send the amp a mono signal though. I beleive most hu's have the option for a Stereo Output on the sub channel or a Mono Output

 

[acold7dusta 10+ year member]

i ran a one coil to each channel of a DVC sub off of a kenwood that produced 150x2 for a couple of days and it sounded the same, but the amps on but i dk if the amp was stereo or mono in LPF. If it hits say a left and right note beat, id imagine itd do damage to the woofer, if in fact thats how it works?

 

[joshpoints 10+ year member]

As long as the driver's thermal and mechanical limits are not exceeded, running the driver using only 1 voice coil will not hurt it ... It will, however, act completely differently as the Qes will be twice as much, Qts will be a little less than twice as much, the motor force (BL^2/Re) will be cut in half, etc.

Wow I wish I knew everything you know.

I actually read that it will cause damage on either crutchfield or on one of jlaudio's old links that they no longer have up. It was either under frequently asked questions or their wiring tutorial. Considering all the material you've posted on this site I believe you.

Where did you learn all this stuff and do you have a degree in sound engineering or something like that?

 

[joshpoints 10+ year member]

2 x 4 ohms stereo = 8 ohms bridged
Might as well just go bridged as it's simpler and the signal can vary from side to side ...

P180.2 is rated:

2 x 90 watts @ 4 ohms stereo

1 x 180 watts @ 8 ohms bridged

2 x 180 watts @ 2 ohms stereo

1 x 360 watts @ 4 ohms bridged

180 watts @ 2 ohms = 19 volts x 9.5 amperes

360 watts @ 4 ohms = 38 volts x 9.5 amperes

What this tells us is that the amplifier has a current limit of about 9.5 amperes. Now, if you were to hook it up at 2 ohms bridged, you could get ...

Power = Current^2*Resistance

9.5^2*2 = 180.5 watts

So is there a point to running 2 ohms bridged ? No, you're just going to screw up your amplifier. Using 8 ohms bridged will get you the same potential output with half the current output (and about half the heat generated), so it's the obvious choice for this setup ...

You're my new role model.

 

[ccajun4real 10+ year member]

IF you mean power only 1 voice coil, the answer is no. You never want to do this.

What's the exact model of the amp? GTO, Power series, LC series etc.

It is a BP 180.2. Called the power series I believe. Here are the specs

http://manuals.harman.com/JBL/CAR/Owner%27s%20Manual/bp_om.pdf

 

[n2audio 5,000+ posts]

Where did you learn all this stuff and do you have a degree in sound engineering or something like that?

Jmac's no engineer, but there are plenty of forums you can search and find hundreds (thousands?) of extremely informative posts by various industry professionals. Many of which ARE technicians/engineers/designers. A lot of the time the info gets so complex it's like sitting through a fairly advanced physics/electronics lecture.

Check out Carsound.com for starters.

 

[Savstyle 10+ year member]

you could just sell me the bp 180.2 and buy a new amp

 

[BigManFred3251 10+ year member]

I would try running for 2 ohm bridged. I have done it before on some bigger amps and didn't run into problems. The only thing that i couldnt do was set the gain to high or it was a nightmare blowing fuses and what not. I know that this is not good, but it has worked numerous times for ppl i talk to and me my self. Just give it a try at a lower gain and see what happens.

 

[ccajun4real 10+ year member]

What about hooking up the +/- from each side of the amp to each side of the sub? Will that yield a 4 ohm load?

Cajun