See all parts that fit your 1981 528i
400W RMS Punch Series Compact 4-Channel Amplifier
Punch Series 4-Channel Class AB Car Amplifier • 50W x 4 chan. @ 4 ohm • 110W x 4 chan. @ 2 ohm • Bridged, 4 ohm: 200W x 2 chan. • MOSFET Power Supply
Learn more about the p400-4
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Punch Series 4-Channel Class AB Car Amplifier • 50W x 4 chan. @ 4 ohm • 110W x 4 chan. @ 2 ohm • Bridged, 4 ohm: 200W x 2 chan. • MOSFET Power Supply
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(newest, current model)
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(previous model, replaced by Rockford Fosgate Punch P400-4)
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Manufacturer:
Model Number:
P400-4
Weight:
12.00lbs
Internal SKU:
p400-4
Internal Product ID:
9893
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Excellent
This amp has been an excellent addition to my system. It puts out a ton of clean power. It puts out much more power than what it is initially rated at. I believe in Fosgate Amps! The only gripe I would mention, albeit a small one, is the fact that the gain and crossover settings are very tiny, plastic, and recessed into the amp. This makes it a bit of a pain to adjust settings but you get used to it after while. I have had no mechanical or sound issues with it. Overall, love it!!
42 found this helpful
Rockford wins!!
I have had Rockford amps in almost all of my vehicles since the late 80's and they have never let me down as far as sound quality and adjustability of levels. This new Punch 400x4 channel amp fills the bill quite well for those looking for a bit more power for under $300. Slim chassis design does not take up any space at all, it fit perfectly under my passenger seat with room to spare. It is running four door speakers on two channels and one 10" sub on the other two, and it hasn't even got warm at the highest levels.
Thank you Sonic for the excellent customer service and instant shipping.
41 found this helpful
Great
Great amp very powerful I have it powering the infinity kappa component 6.5 and jvc 6x9s and they sound great with it turned only half way up and there more then loud enough with a Very clean crisp singnal being sent out I would definetly recommend this amp.
39 found this helpful
plenty of power to spare
i have this installed in a 92 chevy camaro running infinity 4x6 plates in the front and kenwood 5-way 6x9s in the rear. it is plenty of power and it keeps them clean, just took a little while to get it tuned the way i like.
37 found this helpful
good
needs better control over frequency is the cons
pros would be it actually puts out 76watts rms x4 at 4 ohm, 126watts rms x4 at 2 ohm, 256watts rms x2 at 4 ohm bridged
37 found this helpful
Good but slightly inconvenient at first...
This amp will push plenty of power to your speakers but I wouldn't use the punch series speakers with this amp because the mids drown everything out and distort a little sometimes. I had my hp set to 125 for front and 110 for my rear speakers, everything sounds really clear and edgy but not as full and smooth as I like, I just don't think the crossover gives you a convenient way to tune everything so I use pioneer speakers for extra bass and a smoother range of frequencies. If I was to replace this amp, I'd probably buy a kenwood, but I'd look into speaker replacements first, there's nothing wrong with this amp. Note I paid around $350 for this amp in an audio shop.
36 found this helpful
Great as always
I have been running Fosgate amps since I first got into stereos in the early 1990s. I have owned about fourteen Fosgate amps and only had problems with two of them, one was my fault for overheating it because I had my sub box sitting on the amp and the other blew for unknown reasons but both were under warranty and replaced for only the cost of shipping to Fosgate. I have this 400.4 pushing four 6.5" Kicker marine co-axials in my pontoon boat. Prior to this amp, I had them running off of an old Punch 40 (20 year old amp still working) and they sounded very good, but the 400.4 really brought them to life with increased midbass and much brighter highs. I believe the birth sheet said it runs about 75 watts per channel at 4 ohm. I also have on older model of this amp which is much larger that has been running almost 10 years strong.
36 found this helpful
Excellent
fast shipping, great communicator, authentic product, and most important.. trustworthy.
36 found this helpful
Great amp
This amp was suppose to be 50 x 4. When I got it the birth sheet read 76x4 so I'm not complaining. This is such a great amp and underrated. Well worth the value. Pushes my Rockford punch 6x9s and 6 1/2 jbl component set
35 found this helpful
Works
These units were installed on two Harley Baggers along with Polk Audio 6X9 on the bag lids and 5 1/4 speakers in the OEM mounting spots. The system sounds great and has plenty of power for the bikes. Would buy all these products again and would buy from Sonic again and have.
33 found this helpful
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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:
Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.
