Running Fosgate 75HD Amp Indoors

[DreadPirate]

I'd like to run this amp on my bench with a set of 8 ohm speaks, though those specs are not listed:

http://ampguts.realmofexcursion.com/...te_Punch_75HD/

I do have a deep cell battery, but its probably pretty run down. I've read about setting this up with a car charger. Do I just hookup the car charger to the battery then jump from there to the power connections on the unit?

Any thoughts on how good this may sound for a home audio setup?

[Perry Babin]

Have you confirmed that the amplifier is in good working order?

If you haven't used it 'recently' (<very important), you need to power it up and make sure that both channels play cleanly.

[junglejuice]

So you want to use the Punch as a home amp, what do you intend to use as a source unit?
Plus the 8 ohm speakers will want to be quite efficient as the Punch75 would only put out somewhere in the region of 20 or so watts at 8 ohms stereo....

[Mr. Old School]

This is what I've been working on for the last couple of years.

Fully active system all 4Ohm speakers

Speakers:

tweters from MTX Black Gold series

mids from Lanzar DC Series and MTX Black Gold

subs from Monocar Raptor series.


Amps:

Lanzar Optidrive 4150

Autotek 300XI

Crossfire VR2000D


Head unit:

Rockford RFX 8140


Processors from Lanzar:

G2M

E30

X3

at the moment the box is a prototype but the sound is still amazing.

The power supply weighs in at 70 pounds and can put out a constant 240 Amps of current.




[URL=http://g.imageshack.us/g.php?h=512&i=dsc00107xv1.jpg][IMG]

[I Am An Idiot]

It is not ever a good idea to run a Lead/acid battery indoors. If you have an old computer laying around you can take the power supply out of it and use it. Using 8 ohm speakers are the wisest choice unless you are wanting to spend big money on a power supply.
If you do go the computer power supply route, let us know and we can let you know what you have to do to get it connected. We will need to know if it is an AT or an ATX supply.

[junglejuice]

Originally posted by I Am An Idiot
It is not ever a good idea to run a Lead/acid battery indoors. If you have an old computer laying around you can take the power supply out of it and use it. Using 8 ohm speakers are the wisest choice unless you are wanting to spend big money on a power supply.
If you do go the computer power supply route, let us know and we can let you know what you have to do to get it connected. We will need to know if it is an AT or an ATX supply.

Firstly computer power supplies are not regulated so they won't actually provide any real current and maintain 12 volts.
Secondly why would you bother, you firstly need to bring mains voltage down to 12 then step it back up again just to drive the speakers which seems totally pointless and wasteful when a home amp will do the same job with far less waste and less heat.
Thirdly I know that I wouldn't want a car battery in the house with all the associated fumes and ongoing costs.

[DigitalJunkie]

SLA's are sealed,and won't vent gasses into the house (under normal conditions)


I rewound an old Microwave Oven Transformer (MOT) to use as a 12V supply.

http://www.users.qwest.net/~ptaylor/...MOTPSpage.html

I should update the page someday,but I'm lazy.

[junglejuice]

Originally posted by DigitalJunkie
SLA's are sealed,and won't vent gasses into the house (under normal conditions)


I rewound an old Microwave Oven Transformer (MOT) to use as a 12V supply.

http://www.users.qwest.net/~ptaylor/...MOTPSpage.html

I should update the page someday,but I'm lazy.

SLA's are even more expensive just to do the job of a home amp....

[Clipped]

i have a couple of old school non HD versions of the punch 75

these specific amps wont run off of some battery chargers, chargers cant provide the current fast enough for these amps,
you'll have to get a dry cell battery or something....maybe a UPS will work , those have 12 volt batts inside.

all you really need to run that amp is a 12vdc 18ah battery, around $30... and hook it up to the charger.

on the battery alone youll get about 30 minutes full volume playing full range on a 15" speaker...or... just turn on the charger when your playing.

cut out the sub bass and the battery will last longer, that way you wont have to turn on the charger and have the ripple come through the speakers.

i use a battery charger and SLA for my test bench...

[Clipped]

almost frgot, you ma want to hook up a capacitor between the charger and battery to filter the ripple coming from the charger.

i