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Edgarhorn Seismic Sub hums

72.67.235.200
Posted on February 16, 2015 at 09:43:32
Stang
Audiophile

Posts: 124
Location: So. California
Joined: February 29, 2004
 My Seismic Sub with original Hsu plate amp developed low frequency hum with/without input signal from Cyrus Brenneman Audio Cavalier Plus. Level of hum is same if the output level on the amp turned up. The power cord has two prongs and plugged into PS Audio Ultimate Outlet. Any suggestion or recommendation to fix or replace the amp will be greatly appreciated.

 

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Replace that amp, even if it doesn't hum, posted on February 16, 2015 at 15:12:08
rickmcinnis@dogwoodfabrics.com
Audiophile

Posts: 3040
Location: Atlanta
Joined: December 15, 2003
 I have been using a used CROWN K2 for my SEISMICS and find them to like each other just fine.

Those toy amps (I had used the NHTs until, they, too, started doing some strange things) are fine to get started with but those speakers are capable of better performance with a better amplifier.

Consider it opportunity ...

 

Teach it the tune, posted on February 17, 2015 at 16:11:26
Scholl
Distributor or Rep

Posts: 1357
Joined: March 8, 2001
 LOL

 

RE: Edgarhorn Seismic Sub hums, posted on February 17, 2015 at 22:50:35
djk
Manufacturer

Posts: 6135
Joined: June 17, 2000
 Check with Hsu, it's probably the main filter caps.

A few years ago there was a rash of bad filter caps, computers, audio gear, etc., all were hit hard.

 

RE: Edgarhorn Seismic Sub hums, posted on February 19, 2015 at 16:33:51
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
 If nothing changed check the caps as mentioned. If some new gear or cord or the Ultimate outlet was introduced there is a small chance the polarity may be wring on one of them. Probably caps though.


E
T

ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

Thanks for the tip....., posted on February 24, 2015 at 15:04:05
Jim D.
Audiophile

Posts: 854
Location: FL
Joined: October 26, 2000
 I have an older HSU sub with plate amp that a friend asked me to look at with same hum problem. I was going to pitch the plate amp.

Jim

 

It know the tune ..., posted on February 25, 2015 at 12:02:01
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001
 It is humming because it forgot the words!

But seriously, the HSU plate amp may have equalization tailored to that specific sub. If it is repairable, it may be a lot less hassle to do it an keep the specified EQ.

Dave

 

RE: Thanks for the tip....., posted on February 28, 2015 at 15:46:50
Stang
Audiophile

Posts: 124
Location: So. California
Joined: February 29, 2004
 After open the plate amp and found most of components and cables were bonded with RTV and would be difficult to work on it. Talked to Dr. Hsu and I was told the amp is not worth repairing and recommended the model 500A they've on sale for $299. Just installed the 500A and it work fine and sound great for $299. Hsu changed the amp crossover from 51 Hz to 75 Hz. Thanks for all the responses.

 

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