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-   -   Are amplifiers smaller than they used to be? (

KC2OTE 12-04-2019 06:22 AM

Are amplifiers smaller than they used to be?
I haven't bought an amplifier in 15 years and I'm looking to add some to the boat. What I'm finding is that a modern 50x4 appears to be much smaller and cheaper than it's old counterpart. Right now, I have an old Kenwood 50x2 that's slightly larger than the modern 50x4 and the 4 channel version of my old amp was nearly 2x the size of the 2 channel.

I'm concerned because the size and price seem to have both reduced so I'm concerned that a modern 50x4 won't put out the same power as my old amp that I'm replacing.


dev 12-04-2019 06:31 AM

Yes, there has been more and more use of Class D amplification in recent years in new amp designs.

KC2OTE 12-04-2019 06:39 AM

That makes sense... Especially in a marine amplifier where the reduced heat (higher efficiency) of a Class D amplifier would be a huge benefit in confined spaces.


natsb 12-04-2019 07:24 AM

Yes, the Class D amplifiers are smaller, generate less heat, and put out just as much. I replaced three Class A's that resulted in less power draw while providing the same wattage output. Because of the smaller size, I was able to reclaim some shelf space for other toys like the cell phone amp.

KC2OTE 12-04-2019 08:41 AM

Stuff like this really concerns me.... I have this Pyle marine amplifier lying around that's 4"x3" and claims 100x2 RMS at 4ohms. I know it's a piece of crap amp which is why it's been sitting in my toolbox unused for a year but claims like this are just crazy. I'm planning either Kenwood or JL to go into the boat so at least I'll feel somewhat confident in the numbers.

kmoose 12-04-2019 12:10 PM

I installed this amp with a pair of JL 8.8s and it has been rocking for about 3 months now with no issues what so ever. For the price and wattage output its hard to beat and has great reviews.

KC2OTE 12-04-2019 12:42 PM

At 600 watts RMS for the 4-ch version the price is definitely right.... I was looking to spend about the same on a 50x4 so to get 175x4 it's probably worth looking into and even if the power output is exaggerated by 50% it's still going to be plenty of power for the 6.5 speakers I'm pushing, even when I add 4 more and drive it at 2ohm.

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