Is anyone familiar with this issue ?

Anything not covered elsewhere.
Post Reply
Message
Author
djtrumptight
Posts: 823
Joined: Tue Dec 15, 2009 6:08 pm
Location: Detroit,Michigan

Is anyone familiar with this issue ?

#1 Post by djtrumptight »

Amp is QSC GX7,2 T48's on each channel for a 4 ohm load.I recently did a rental and after getting everything up and running i noticed my bass was low and 1 channel on my amp was clipping which has become a signal to me that something is wrong with 1 of my woofers.If i unplug the problem speaker the bass becomes louder on that channel,connecting the speaker back is like reversing the polarity on one and seems to cancel out the other.As of right now my plan is to send it out to be reconed.Touching on various parts of it makes it louder.I have had problems with the leads going to the speaker jacks on this woofer and i soldered it back.

https://www.youtube.com/watch?v=N6U_Rvi ... e=youtu.be
Built:
2 Autotuba's MCM 55 2421
8 T48's 24"wide 3015 LF
2 DR 250's melded Deltalite II 2510
2 DR 250's flat Deltalite II 2510
2 SLA HT systems
1 Table Tuba Dayton DCS 255-4
2 T 39's 20" wide 3012 LF
1 T-18 13" wide MCM 55 2421
2 SLA Pro's

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Is anyone familiar with this issue ?

#2 Post by Bruce Weldy »

video doesn't work

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

User avatar
Tom Smit
Posts: 7457
Joined: Sat Jan 05, 2008 1:24 pm
Location: Sarnia, Ont. Canada

Re: Is anyone familiar with this issue ?

#3 Post by Tom Smit »

Bruce Weldy wrote:video doesn't work
....because it hasn't been made public yet (ie, still private).
TomS

djtrumptight
Posts: 823
Joined: Tue Dec 15, 2009 6:08 pm
Location: Detroit,Michigan

Re: Is anyone familiar with this issue ?

#4 Post by djtrumptight »

Sorry fellas,the video has now been made public.
Built:
2 Autotuba's MCM 55 2421
8 T48's 24"wide 3015 LF
2 DR 250's melded Deltalite II 2510
2 DR 250's flat Deltalite II 2510
2 SLA HT systems
1 Table Tuba Dayton DCS 255-4
2 T 39's 20" wide 3012 LF
1 T-18 13" wide MCM 55 2421
2 SLA Pro's

User avatar
Tom Smit
Posts: 7457
Joined: Sat Jan 05, 2008 1:24 pm
Location: Sarnia, Ont. Canada

Re: Is anyone familiar with this issue ?

#5 Post by Tom Smit »

Vid is working. :clap:

Wow, that's weird... that it gets louder regardless of where you touch. Does the problem follow the driver, and not bound to one channel? I''m pretty sure that you indicated that but I'm simply looking for clarity. :)
TomS

User avatar
Bill Fitzmaurice
Site Admin
Posts: 28619
Joined: Tue May 02, 2006 5:59 pm

Re: Is anyone familiar with this issue ?

#6 Post by Bill Fitzmaurice »

That's strange, it looks more like an amp fault than a driver fault.

djamps
Posts: 38
Joined: Tue May 23, 2017 8:21 pm

Re: Is anyone familiar with this issue ?

#7 Post by djamps »

I agree it looks like an amp or wiring issue

At least check the speaker with an ohm meter between terminals and from each terminal to the basket, then also test the wiring and connectors.

djtrumptight
Posts: 823
Joined: Tue Dec 15, 2009 6:08 pm
Location: Detroit,Michigan

Re: Is anyone familiar with this issue ?

#8 Post by djtrumptight »

I did check the amp channels at the event,switched the speaker wires,other set of T48's worked fine on that same channel.In the demonstration video i posted the driver was connected to a computer speaker system while a 60 hz signal was playing thru Audacity.This the driver i had a problem with before because of a broken tinsel lead wire.I think i will just have it reconed,aside from this driver i have 3 blown 3015lf's and i built 4 more T48's last summer that i never put drivers in and i plan to use all 8 of them for an event coming in August so i guess the time is now.Thanks for the input.
Built:
2 Autotuba's MCM 55 2421
8 T48's 24"wide 3015 LF
2 DR 250's melded Deltalite II 2510
2 DR 250's flat Deltalite II 2510
2 SLA HT systems
1 Table Tuba Dayton DCS 255-4
2 T 39's 20" wide 3012 LF
1 T-18 13" wide MCM 55 2421
2 SLA Pro's

Post Reply