Can I bridge a Punch 150 HD?

[Ming696]

I've had this amp sitting around my room for a few years. Its a Fosgate Punch 150 HD. Old school I know, but these were some of the best amps fosgate made. It used to be in my truck and it pushed a couple 8's with ease. Now that I've blown my sub amp, I would like to use this one, but it doesn't have any bridging switches. I've heard it can be bridged though so how would I go about doing it?

[King Electro]

I looked earlier when you mentioned it in another thread. I didn't find anything that said it can or can't. It's pretty old skool so it might not, or it might fry the amp???

IF you could bridge it, it should be 1 + and 1 - of different channels. Like orange and brown or black and yellow. Try it on 1 speaker first before you try to wire in 2.

[AllenBomber]

I highly doupt that amp to be bridgable. A stereo amp thats bridgable has to have load stability on each channel half of the bridged load stability. Thats a little complicated. An example might make it easier to understand. A 2 channel bridgable 200w amp would have stats like:
100x2 @ 2 ohms
200x1 @ 4 ohms
(see, the load has to be doubled when put into a "bridged" mode)
Your amp is rated at 75x2 @ 4 ohms. This means if it was bridged, it'd have to be run at 150x1 @ 8 ohms

You could try it though. Bridging an amp without switches is easy. Just run the + of channel 1 to the + terminal of your sub, tie the - terminal of channel 1 to the + terminal of channel 2, and run the - terminal of channel 2 to the - terminal of the sub. Like this:

|--- (+) Amp ch1 (-) ----- (+) Amp ch2 (-) -----|
|-----------------(+) sub (-) ------------------|

I'll warn you though. Bridging an un-bridgable amp can do a few things. It could work... or it could kick the protection circuit on every time... or what happened the last time I bridged an un-bridgable amp was it just blew out the second channel. You might not want to try it if you care about the amp at all.

What kind of sub are you gonna be running with this amp? If its anything Dual Voice Coil, you can safley run a channel of the amp to each of the coils on the sub, as in channel 1 to coil 1, and channel 2 to coil 2.

[Ming696]

Originally Posted by AllenBomber

Bridging an amp without switches is easy. Just run the + of channel 1 to the + terminal of your sub, tie the - terminal of channel 1 to the + terminal of channel 2, and run the - terminal of channel 2 to the - terminal of the sub. Like this:

|--- (+) Amp ch1 (-) ----- (+) Amp ch2 (-) -----|
|-----------------(+) sub (-) ------------------|

Thats how I've heard to do it before, but wasn't sure if it was true. I'm not sure what sub I want to go with. Its going to be a 10". I had planned on going with a fosgate rfd2210. I may run the amp normally, or I may get a new mono amp and series bridge a dual voice coil sub. The amp I'm looking at will run a 2ohm load so thats not an issue.

[Import Power]

Originally Posted by AllenBomber

I highly doupt that amp to be bridgable.

Sorry, Wrong Answer Chuck

I worked with RF amps for 12 years. That amp is VERY bridgeable. The actual BRIDGE mode shouhld be printed on the amp labled on the outputs or on the bottom. It's been years so I can't remember but it's + from one channel and - from the other.

I want to say brown and yellow but don't qoute me on that

[94-3kgtBase]

its bridgable... and as all old school rf products very under-rated. most of those things are capable of outputting over 200 watts without trying. i put one of the smaller ones in my sisters car pushing 2 older jl 12's, and it hits hard.
i'm still up on my offer to help re-wire everything as well.
jesse