Fosgate Punch Amps and Woofers?
 

I have a Punch 12" Woofer rated at 150rms and 300max at 4ohms

Can I get a Punch 200 rated a 100w at 4ohms?

I know back in the day I ran a Punch 150 to push a 15" single sub and it hit hard. I know these amps are unrated, but does anyone have experience in these two combinations?

it would be a shame to see/hear a 911 with thumping rap music.

not a car stereo guy but, are you concerned about the power ratings?
you can use a 20 watt or a 2000 watt amp, you just have to be carefull.
an under powered amp can damage a speaker just as fast as too much power.
what happens is, you push the under powered amp harder trying to get the same volume as a 200watt amp, driving it into clipping. when it clips, it is basically sending a DC voltage to the speaker and you melt the coil. the DC holds the coil at one extreme or the other, the harder you push it, the longer it stays bottomed or extended.
some speaker systems will put a large cap at the input to block DC, but still allow full range to pass to the crossover.
with my PA equipment, i prefer to over power and not use it, but have it for reserves.

Lol, then you should be happy since it's for a 928. SmileWavy

Ok, so I guess I should look into an amp rated at least 150watts at 4ohms. I am not looking to thump anymore, I got past all that back in the late 80's with a Noise Violation Ticket. I just want a little Bass from my new alpine Head Unit I just installed. Highs and Mids sound great in the stock Blaupunkt Speakers.

928, good one.

if you are not looking for max volume, 100-150 will be fine.
these hi powered car amps always baffled me. are they quoting true power ratings? and how do they get that power from a 12v source and a small package.
i guess the technogy has leaked over to the live music stuff. my brother has a 600w bass amp the is the size of a book. power like that usually came from large transformers and capacitors.
for my house, i have a 100W NAd pushing 200w klipsch speakes, but, the amp has plenty or reserve power for the peak stuff, plus, this thing is more than loud enough that i dont push it into clipping and the amp has soft clipping protection.

what you really need to keep an eye on is impedance. dont use speakers or wire them so the ohms is less than the amp can handle.

So a 100 watt at 4ohm amp is ok with a Woofer rated at 150watts 300max at 4ohms?

Do you have an old school Punch 200 like this?
http://ampguts.realmofexcursion.com/Rockford_Fosgate_200DSM/

If so just bridge the amp and be careful so you don't bounce the woofer out of the box. Those Punch amps are powerhouses and nearly bulletproof.

Subwoofers are useful for more than just rap music, but I think you already know that.

I have a single 10" in my 930.
<a href="http://www.flickr.com/photos/willtel/3464344366/" title="IMG_8214 by willtel, on Flickr"><img src="http://farm4.static.flickr.com/3651/3464344366_d1f45eab19.jpg" width="500" height="333" alt="IMG_8214" /></a>

It's actually a 200m, non bridgeable. Specs are close though.

Just for the record, amps don't push speakers . . . They supply power. Power(watts)=E (volts) X I (current)

Class D amplifiers are now commonly used in cars - especially for sub amps (in home subs too btw). They don't require massive transformers.

You have to carefully match the power cables from battery to amp. Keep them short and follow the specs for the guage required to avoid arc welding in your car.

Ian

Ok guys, broke down and bought a bigger amp on eBay. Decided to not get the local one which would just be enough power (Punch 200M).

It's Output Power Bridged/Mono: 360 watts x 1

I got a Rockford Fosgate Punch 360A2

http://www.energenix.com/rockford-fo...unch-360a2.gif

Features
Bridgeable: Yes
Crossover Frequency: 50-210 Hz HP/Full/LP
Crossover Slope: 12dB/octave Butterworth
Frequency Response +/- 0.5dB: 20hz-20khz
Input Sensitivity: 250mV-4V (low level) 650mV-11V (high level)
Output Power 2 ohms: 180 watts
Output Power 4 ohms: 90 watts x 2
Output Power Bridged/Mono: 360 watts x 1
Punch Bass: Variable 0 ~ +18dB @45Hz
Signal-to-Noise (A weighted): >100dB
THD Disto: <0.05%
Dimensions: 2.6"(H) x 9.6"(W) x 8.7"(L)

why do you have to make this so technical? he knows what i am saying. you must be an engineer, no? and thanks for the math formula. as an electronics tech for the FAA for the past 17+ years i forgot that one http://forums.pelicanparts.com/suppo...eys/spankA.gif al

pushing
driving
feeding- i have 2 crest 1500's feeding 2 ev tops and one driving the subs.
all are acceptable terms to indicate what you have powering speakers. im sure there are a few more. this is common terminolgy in the music world, especialy live sound.

its nice to have the reserves when you need it. even though it did not say it and you only have the one sub, the bridged min impedance is 4 ohms, its usually double the min stereo impedance.
i dont know if this is enough power to give you problems with your alt, probably not, but if it is, you may need to add a capacitor to the charging system to provide the extra power when the lows really kick in if you alt's amp rating is not enough. like i said, im not a car stereo guy, so i dont know at what point this will be an issue. i gave a cap to a guy at work because his lights would dim with the bass. i dont remember the value, but it was BIG, came out of the power supply for the radar system. physically bigger than a coke can, probably put a strain on his system just charging that baby up.

It's perfect. in 14.4V that amp is much stronger than that. Better to have too much power VS. too little so you don't overheat the coils thru distortion.

Plug it in and don't worry about it.

In my TBSS I have a P150HD old school running ONE new generation p12" 4 OHM (system impedance = 2Ohm) and it'll rip your head off at full tilt. The new drivers are amazingly easy to work with.

rjp

Not a engineer. But I sell consumer electonics and the term 'push' has always 'pushed' me over the edge.

The formula above is very applicable for calculating the size of wire needed for the power supply feed and fusing for the amp.

I use 2 X 8" focal woofers operating at 2 ohm with a Focal amp that 'produces' 800 watts @ 2 ohm. It 'drives' them well.

Ian

me too, as far as being corrected on a commonly used term that really does not matter in such a casual conversation about power amps.

the formula is really not needed in calculating wire size and fuse since you are concerned about current draw, not power produced.

been a long time but i seem to think i had a punch 25(??) running at 2ohms for my front/rear and a 75 maybe bridged to a 18" sub in my celica.

that ***** was loud and tight and did not need ANY more power. crazy power out of those amps.

for the record i played more janes addiction and metallica than anything else (very little rap).