Get Free, Friendly, Expert Advice
Call 1-866-244-8796 or email

Designed and Manufactured in Canada Since 1980


AxiomAudio Blog

Positioning Floorstanding Speakers

Our Newest Flagship Model: The M100

Why We Make Our Own Drivers

Wall'O'Fame
"Serenity Cinema", now with 40% extra Serenity!
Updated as requested.
Who's Online
1 registered (JBG), 121 Guests and 7 Spiders online.
Key: Admin, Global Mod, Mod
Financing
Forum Stats
12723 Members
11 Forums
22686 Topics
400534 Posts

Max Online: 378 @ 02/24/13 04:33 PM
Top Posters
Ken.C 17696
pmbuko 16225
SirQuack 13311
CV 11064
MarkSJohnson 10681
Meanwhile On Facebook

8| Don't miss Andrew Welker's post on our message boards about the new subwoofer...

󾓲 The April Newsletter is out! Did you get your copy? http://www.axiomaudio.co...

Double-take! :O How well do you know our line? First one to spot the surprise...

Page 2 of 2 < 1 2
Topic Options
Rate This Topic
#205074 - 04/22/08 07:45 AM Re: Active Auto On/Off on EP175 [Re: JohnK]
kazkru Offline
frequent flier

Registered: 12/27/07
Posts: 12
Ok, did a little experimenting last night. It's definitely the receiver/amp that is causing the hum and not the sub or the sub amp. As I mentioned, my receiver/amp is a tube amp, and when I unplugged it from the power source, the quiet hum on the sub stopped completely. However, with the receiver/amp still plugged into the power source, even with it turned off, the sub still hums. In other words, the receiver/amp is sending a continuous signal to the sub, which appears to the be the reason the sub is not shutting off.

I'm no electronics expert, but I guess my receiver/amp either leaks juice when turned off or it is not grounded properly.

Kaz

Top
#205077 - 04/22/08 09:03 AM Re: Active Auto On/Off on EP175 [Re: kazkru]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
Are the Sub and Amp plugged into the same outlet? If not, try that.
_________________________
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos

Top
#205174 - 04/23/08 08:39 AM Re: Active Auto On/Off on EP175 [Re: kazkru]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10681
Loc: Central NH
 Originally Posted By: kazkru
As I mentioned, my receiver/amp is a tube amp, and when I unplugged it from the power source, the quiet hum on the sub stopped completely.


Aaaaahhhh... that explains it.

It's not hum that you're hearing, it's warmth!
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

Top
#205177 - 04/23/08 08:54 AM Re: Active Auto On/Off on EP175 [Re: MarkSJohnson]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3269
Loc: Laval, Quebec, Canada
[quote=MarkSJohnsonAaaaahhhh... that explains it.

It's not hum that you're hearing, it's warmth! [/quote]
That's was really funny! \:D
_________________________
E = MC2 = ((2M80 + VP180 + 4QS8)/(EP800 + EP500))^(ADA1500 x D2v)
Audiobytes! 2M22! 2VP150!

Top
#205203 - 04/23/08 12:28 PM Re: Active Auto On/Off on EP175 [Re: kazkru]
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3178
Loc: Toronto/New York/Dwight
Hi kazkru,

Very good trouble-shooting on your part. Now you can try connecting a separate ground wire to a chassis screw on your tube receiver amp. Run the ground wire to a known ground if you have one (a cold water pipe?) and see if the hum disappears when you touch the ground wire to the ground, or you could try the center screw on a household AC outlet, if it's properly grounded.

An alternative would be to run the ground wire to a chassis screw on the rear panel of the subwoofer amp. That may eliminate the hum. I once had to run a separate ground wire from a big old Macintosh tube power amp chassis to the pipe underneath a basement bar installation. The reviewer/journalist (an icon on Canada's CBC radio network; for those with long memories, it was Clyde Gilmour of the network radio show, "Gilmour's Albums") was so grateful to me, he mentioned me on-air and gave the magazine which I edited at the time (Sound Canada) a nice plug.

A bit of a digression, but I mention it to illustrate the extreme measures that are sometimes necessary to get rid of hum.

Regards,

Alan
_________________________
Alan Lofft,
Axiom Resident Expert

Top
Page 2 of 2 < 1 2



Moderator:  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 

Home  |  Corporate Info  |  Products  |  Message Board  |  FAQs  |  Warranty  |  Site Map  |  Privacy Statement   |  Contact Us

©2014 Colquhoun Audio Laboratories Limited
All Rights Reserved.