Help with Amp

[jimmydean]

2 x 120W @ 2 ohms (12V) from what I can find. Depending on the power rating of the speakers, you could run all 4 with good performance. If the 6x9's need more than 75w rms each, then just run the 6x9.

I wouldn't filter the highs too much on the 6x9s since they are 3ways.

[custom1970]

Originally Posted by jimmydean

2 x 120W @ 2 ohms (12V) from what I can find. Depending on the power rating of the speakers, you could run all 4 with good performance. If the 6x9's need more than 75w rms each, then just run the 6x9.

I wouldn't filter the highs too much on the 6x9s since they are 3ways.

your right, it is 120w @ 2 ohms (even though i'm not sure what that means) i found some info on the Amp online, apparently it's considered a pretty bullet proof Amp. How would you suggest i wire everything for all 4 speakers? Just hook them up in series left/right each going to a channel or what? I assume this Amp creates a fair amount of heat, but it should be ok under seat?

And GCncsuHD, thanks for the comments, and my truck has also been in the family a while, was originally my grandfathers

[GCncsuHD]

Originally Posted by jimmydean

2 x 120W @ 2 ohms (12V) from what I can find. Depending on the power rating of the speakers, you could run all 4 with good performance. If the 6x9's need more than 75w rms each, then just run the 6x9.

I wouldn't filter the highs too much on the 6x9s since they are 3ways.

Keep in mind that amp was made well before the CEA standards for amplifier ratings. HiFonics does not even specify RMS or Max ratings for that amplifier, but they do state that it was tested between 11.5-16 volts, rather than the specific 14.4V amps are tested at now. Remember it was likely tested right at that 16v max where it would give the most output although that is not likely where the amp will be operated at. Judging by the overall size of that amp, I doubt it is good for much more than 100 watts RMS at 4 ohms, maybe it would do 150w at 2 ohms, but I would begin to worry about longevity and overheating at 2 ohms as it does not look to be built for great cooling.

And I would filter the highs out of the 6x9s to get the best highs from the 6.5s without interference from the 3way 6x9s screwing with the sound since they are not aimed properly for highs and due to the speed of sound the sound will reach your ears at different times, it is very slight, but it is noticeable. The wavelength of the lows travels differently and aiming for that is not nearly as important.

Originally Posted by custom1970

your right, it is 120w @ 2 ohms (even though i'm not sure what that means) i found some info on the Amp online, apparently it's considered a pretty bullet proof Amp. How would you suggest i wire everything for all 4 speakers? Just hook them up in series left/right each going to a channel or what? I assume this Amp creates a fair amount of heat, but it should be ok under seat?

And GCncsuHD, thanks for the comments, and my truck has also been in the family a while, was originally my grandfathers

Assuming your speakers are 4 ohms, wiring them in series would make it 8 ohms per channel with 2 speakers wired in series per channel. This would greatly reduce the output of the amp. Wiring them together in parallel would make it 2ohms on each channel which would increase the output of the amp, but also create more heat so make sure to mount it in a well ventilated area or it may overheat and cut off unexpectedly.

Good to see these trucks staying in the family, my 67 was bought new by my great grandfather as well

[custom1970]

Ok, you guys know a heck of a lot more than me about this, i appreciate all the help. Think i'll just hook it up to the 6x9's and see how that works, it's an easier install anyway and they do need the most help since the bench seat and bad angle they're sitting at is killing them. Thanks again and will let you guys know how it works out.

[jimmydean]

Originally Posted by GCncsuHD

Keep in mind that amp was made well before the CEA standards for amplifier ratings. HiFonics does not even specify RMS or Max ratings for that amplifier, but they do state that it was tested between 11.5-16 volts, rather than the specific 14.4V amps are tested at now. Remember it was likely tested right at that 16v max where it would give the most output although that is not likely where the amp will be operated at. Judging by the overall size of that amp, I doubt it is good for much more than 100 watts RMS at 4 ohms, maybe it would do 150w at 2 ohms, but I would begin to worry about longevity and overheating at 2 ohms as it does not look to be built for great cooling.

Well, the rating I found was listed at 12V and I know from experience that the older HiFonics did well at 2ohms. Don't be mislead by the physical size of the older amps. The PPI 100w I used in a pro class truck put out nearly 1000w total and was smaller than that. IASCA National champ, no cooling issues.

[custom1970]

Hopefully this is the last question. The AMP has a place for a wire on the back for what it calls (remote turn on) How would i hook this up? Do i need to run a 12v wire with a switch in it or what? thanks!

[GCncsuHD]

Originally Posted by custom1970

Hopefully this is the last question. The AMP has a place for a wire on the back for what it calls (remote turn on) How would i hook this up? Do i need to run a 12v wire with a switch in it or what? thanks!

Most aftermarket radios will have a remote turn on lead, usually blue in color. This will switch the amp on when the radio is on. You could also run this wire to a 12v+ ign source so that the amp comes on anytime the truck is on, but be forewarned you will probably get a feedback pop through the speakers when you turn it on. When you have it hooked up through the radio, it usually has a 1/2 second delay or so to avoid this pop. I don't recommend a 12v switch as it just adds one more thing to forget and come out to a dead battery.