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Post by Boomzilla on Sept 30, 2019 3:23:37 GMT -5
I have one otherwise high-quality sub that hums. It hums whether a source is hooked up to it or not. I'm assuming that the power supply caps are gone on the original plate amp.
Rather than repair the existing plate amp, I'd just as soon replace it. Parts Express offers a wide variety of plate amps at various prices. I'm assuming that the proper procedure would be to measure the existing plate amp's dimensions and buy one of similar physical size? The power will be academic since the original plate amp was only rated for 75 watts. I'm further assuming that the only wires I'll have to switch inside the sub box are the two going to the driver?
Are there any unanticipated problems I might face in this endeavor?
Thanks - Boomzilla
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Post by 405x5 on Sept 30, 2019 8:38:34 GMT -5
Yes.
Should you go that route, be sure the amp. You choose is guaranteed to work with the make, year and model of your subwoofer.
The plate amp. for certain subwoofers from now defunct Velodyne, for example are designed to control the servo mechanism. Using the wrong Amp. could make for some interesting and possibly disastrous effects.
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DYohn
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Post by DYohn on Sept 30, 2019 9:12:21 GMT -5
The most important consideration for an easy swap is physical size. If your new amp is not the same size you will have to fabricate a plywood mounting plate to fill the hole.
Is this the M&K? No surprise if so. I've swapped four of them over the years - never the 75 watt so i can't advise if there is a direct drop in replacement... In fact I still have a few remains of those amps in my shop for parts I might use in projects. I really should just toss that stuff.
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Post by stads77 on Sept 30, 2019 10:07:37 GMT -5
Another thing to consider would be the port tuning, if it’s a ported subwoofer. You don’t want to feed it too many watts below it’s tuning. If it’s sealed, shouldn’t matter too much.
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Post by Boomzilla on Sept 30, 2019 10:14:02 GMT -5
Making it easier - this is a sealed box with no feedback loop. Simply a driver in a (very highly braced) box.
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DYohn
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Post by DYohn on Sept 30, 2019 11:05:55 GMT -5
Just measure the flange size and see if Parts Express has an amp that will fit. Look for anything 250 watts or lower. Their 100W subwoofer plate amp is a very nice performer, actually.
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Post by Boomzilla on Sept 30, 2019 11:12:49 GMT -5
Thanks, David - going to measure now.
The existing plate amp total dimensions are 8.5" square. I can get plate amps from Parts-Express with larger plates (requiring that I saw out the existing box for them to fit), or plate amps with at least one dimension smaller (requiring a plywood mounting plate between the sub and the new amp.
Which do you recommend?
Thanks - Boom
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Post by creimes on Sept 30, 2019 17:34:13 GMT -5
Smaller and fitting a piece of plywood or MDF over the existing hole, if ya mess it up you can easily redo another one.
Use the old plate amp to trace out the size for the plywood or mdf, cut that and then using a jigsaw cut your new plate amp size in it.
Chad
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Post by redcoat23 on Sept 30, 2019 19:37:06 GMT -5
Thanks, David - going to measure now. The existing plate amp total dimensions are 8.5" square. I can get plate amps from Parts-Express with larger plates (requiring that I saw out the existing box for them to fit), or plate amps with at least one dimension smaller (requiring a plywood mounting plate between the sub and the new amp. Which do you recommend? Thanks - Boom To be honest I would just seal off the hole and not worry too much about getting an amp to fit the size. Fit a pair of terminals to the back and then create a separate box to house the amplifier. Or just go for a rack mount amp. |
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Post by Gary Cook on Sept 30, 2019 22:49:02 GMT -5
My 20 cents, before you go out and buy a plate amp maybe you should try one of your other quality power amps (I'm sure you have a few lying around) and see how it sounds. You might be surprised at how much better a decent quality amp sounds power a sub woofer, I know I was.
Cheers
Gary
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Post by Boomzilla on Oct 1, 2019 0:48:30 GMT -5
...before you go out and buy a plate amp maybe you should try one of your other quality power amps (I'm sure you have a few lying around)... So THAT'S what I should do with that spare Krell!  |
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Post by Boomzilla on Oct 1, 2019 9:06:10 GMT -5
Actually, I think I'm going to select "plan C." I'll just donate this hummer to the local thrift shop that helps battered women and keep an eye out for another high-quality 12" sub.
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DYohn
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Post by DYohn on Oct 1, 2019 9:08:09 GMT -5
Smaller and fitting a piece of plywood or MDF over the existing hole, if ya mess it up you can easily redo another one. Use the old plate amp to trace out the size for the plywood or mdf, cut that and then using a jigsaw cut your new plate amp size in it. Chad ^^This |
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Post by Gary Cook on Oct 2, 2019 1:53:35 GMT -5
...before you go out and buy a plate amp maybe you should try one of your other quality power amps (I'm sure you have a few lying around)... So THAT'S what I should do with that spare Krell! Why the hell not! Just doeit! I used to think any old amp would do for a sub. It's just a sub woofer after all. Not really important. Until, just because I had one that needed testing on a low ohm load, I tried an XPA-1L. Yep, a good power amp does make a difference even to a sub woofer. Cheers Gary |
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