No low frequency output from one of my studio monitors! - Telecaster Guitar Forum
The Number 1 Fender Telecaster Guitar authority in the world.
   

Go Back   Telecaster Guitar Forum > The DIY Channel > Shock Brother's DIY Amps
Forgot Username/Password? Join Us!

Shock Brother's DIY Amps Building or modding your amp? Then use this forum to discuss the process and show your pride and joy.


Wilde Pickups by Bill & Becky Lawrence WD Music Products Amplified Parts Mod Kits DIY Amps, Mods, Pedals dallenpickups.com Warmoth.com seymourduncan.com


Forum Jump


Reply
 
Thread Tools
Old March 8th, 2013, 04:01 AM   #1 (permalink)
Tele-Meister
 
Greg Seaman's Avatar
 
Join Date: Jun 2009
Location: Massachusetts
Age: 61
Posts: 175
No low frequency output from one of my studio monitors!

I'm not sure if this belongs here but I suspect this is where the most knowledgeable electronics techs hang out. I did play my guitar through these monitors often (when they both worked). Fair enough?

The problem exists with an Event active studio monitor that powers on but has no low frequency output. There is high frequency output from the tweeter. The monitor is a bi-amp affair with a separate channel for hi frequency and another for low. The woofer itself tests good with a DC resistance of about 8 ohms and no mechanical noise when the cone is moved manually.

I assume the low frequency channel of the amplifier must be the problem. Besides a channel fuse or another obvious problem like cold solder joints, where is a good place to start troubleshooting this amp or solid state amps in general? I have a decent digital multimeter and soldering equipment but no oscilloscope, etc. Thanks in advance!

__________________
"Down every road there's always one more city, I'm on the run the highway is my home." - Merle Haggard
"Break on through to the other side." - Jim Morrison
Greg Seaman is offline   Reply With Quote

Old March 8th, 2013, 07:31 AM   #2 (permalink)
Tele-Holic
 
LeroyBlues's Avatar
 
Join Date: Apr 2008
Location: Michigan
Posts: 927
I really won't be able to help you as it's over my skill level. But others will. However, a bit more info will be needed. Is "Event" a brand? I suggest you list the brand and model at min. Also do a search for any schematic for it. If you have it apart, take pictures, lots, and close up, so others can see the layout. Good luck.
__________________
Directions? What directions. No one told me there were directions.
LeroyBlues is offline   Reply With Quote

Old March 8th, 2013, 07:58 AM   #3 (permalink)
Friend of Leo's
 
printer2's Avatar
 
Join Date: May 2010
Location: Canada
Age: 54
Posts: 4,932
Other than a loose wire or fuse I would say servicing a transistor amp is pretty much above the average person's pay scale.
printer2 is offline   Reply With Quote

Sponsored Links   #
Sponsored posting
 

Old March 8th, 2013, 01:05 PM   #4 (permalink)
Tele-Meister
 
Join Date: Mar 2009
Location: Northern California
Posts: 303
i had a set of JBL bi-amp monitors for a long time, something similar happened to them. There wasn't really anything i could do with them - i took them to a JBL repair guy who fixed them, i think the filtering caps had failed and needed to be replaced.

If yours has only lost the bass and it's bi-amp it's possible that the bass amp is fried and needs to be looked at or it could be something more simple than that. sorry i can't be of more help.
jchabalk is offline   Reply With Quote

Old March 8th, 2013, 07:22 PM   #5 (permalink)
Friend of Leo's
 
Join Date: Jun 2006
Location: Maryland
Age: 53
Posts: 2,875
To Bi-amp, you need a line level filter(actually 2 filters, one low pass, one high pass) in front of 2 amps driving 2 speaker drivers. The filter is usually active, and as such are not as rugged as passive speaker level filters (called a crossover). So you could have a failure in the low pass filter, the bass amp, the wiring connection the amp to the speaker, or the LF speaker driver itself.

Just because a drivers voice coil measures a reasonable DC resistance does not mean the driver is good, so what have you done to check it?
celeste is offline   Reply With Quote

Old March 12th, 2013, 05:45 AM   #6 (permalink)
Tele-Meister
 
Greg Seaman's Avatar
 
Join Date: Jun 2009
Location: Massachusetts
Age: 61
Posts: 175
Thanks Guys!
__________________
"Down every road there's always one more city, I'm on the run the highway is my home." - Merle Haggard
"Break on through to the other side." - Jim Morrison
Greg Seaman is offline   Reply With Quote

Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


» Random Photo for Guests
G.C. Exclusive Telecaster
Untitled Document



 


Powered by vBadvanced CMPS v3.2.2



IMPORTANT:Treat everyone here with respect, no matter how difficult! No sex, drug, political, religion or hate discussion permitted here.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 RC 2
© TDPRI.COM 1999 - 2014 All rights reserved.