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08-11-2010, 05:42 PM
| | |  Ampeg 4x10 Mod question
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I've attached a photo of an Ampeg 4x10 cab that I bought a few years back in hopes that someone may be able to explain to me exactly what the mod is that the previous owner did to it. The best info I can give to go on is that as it is currently set up, only two of the four speakers actually has any output. Any one with any info on what this mod is, why it would be done, and how to reverse it? Thanks in advance for any input, I know squat about the tech side of amps and cabs. I just like to plug in and rock   |
08-11-2010, 05:49 PM
| | Registered User
Owner, Bill Fitzmaurice Loudspeaker Design | | Join Date: Sep 2004 Location: New Hampshire | | | The mod is a twist-lock AC connector, which has no business being in a speaker cab. What was done inside can only be determined by going inside. |
08-11-2010, 05:55 PM
| | | | Thanks for the quick reply. Yeah, its a mystery to me what that plug is doing there. When I played out regularly, I always ran the cab along with a 1x15 and never really paid much attention to the fact that I was only getting output from two of the 10's. I may try to get a local shop to open it up and have a look see. |
08-11-2010, 05:58 PM
|  | Less Ebay, more Mel Bay | | Join Date: Jul 2007 Location: Phoenix, AZ | | Take the input jack off with a screwdriver and shine some lights in there, snap some photos.
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08-11-2010, 06:01 PM
| | Registered User | | Join Date: Jun 2003 Location: Minnesota | | | lol looks like some was too impatient to wait too get some locking jacks lol i wonder whats behind that plug
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08-11-2010, 06:11 PM
| | | As this appears to be a bit of a one of a kind situation, I'll pop the back off and see if I can get some pics of the guts up in a few minutes to satisfy the curious |
08-11-2010, 06:40 PM
| | | Here's what i can see so far  |
08-11-2010, 06:41 PM
| | | | The thick black and white wires run from the plug to the input jack |
08-11-2010, 06:41 PM
| | Registered User | | Join Date: May 2002 Location: Kunsan AB, South Korea | | | My guess is that there is a power amp in there. |
08-11-2010, 06:43 PM
|  | yiffffffTASTIC | | Join Date: Nov 2008 Location: California | | | sub'd |
08-11-2010, 07:01 PM
|  | Registered User | | Join Date: Nov 2007 Location: boston, ma | | | Pull a speaker and take some pics from the front. This is really odd. |
08-11-2010, 07:04 PM
| | | | Keep checking back... i have to step away for a few minutes, but i will post more pics soon |
08-11-2010, 07:11 PM
| | Registered User | | Join Date: Jan 2006 Location: Brookfield, CT | | | The twistlock was added because the previous owner thought it was 'better' than the 1/4" jacks when used with his big Crown power amp... and now only two speakers work because they are wired series/parallel, and one of them is blown. That would disable one pair. Betcha. |
08-11-2010, 07:12 PM
| | Registered User | | Join Date: Sep 2009 Location: Richmond, VA, USA | | | wow...i don't know much about cabs but that looks...wrong. sub'd, curious what the hell is going on - about like when i found out my factory labeled 8ohm 8x10 was actually a 4 ohm... |
08-11-2010, 07:15 PM
| | Registered User | | Join Date: Sep 2008 Location: Sioux Falls, SD | | | I gotta huge AC power cord that'll fit right on that.
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08-11-2010, 07:27 PM
| | Registered User | | Join Date: Jan 2006 Location: Brookfield, CT | | Quote:
Originally Posted by rbonner  I gotta huge AC power cord that'll fit right on that. | Lol...your the best, Bob. It'd make a really loud B for a second or two, right? Lol..... |
08-11-2010, 07:44 PM
| | Registered User | | Join Date: Nov 2007 Location: boston, ma | | Quote:
Originally Posted by dmusic148 The twistlock was added because the previous owner thought it was 'better' than the 1/4" jacks when used with his big Crown power amp... and now only two speakers work because they are wired series/parallel, and one of them is blown. That would disable one pair. Betcha. | Sounds like a pretty safe bet. |
08-11-2010, 07:47 PM
| | Registered User | | Join Date: Sep 2009 Location: Richmond, VA, USA | | | so, a guy trusts his (probably, i'm assuming considering the AC plug) bootleg Speakon-to-ac-plug speaker cable to a standard 1/4" jack?
at least the soldering isn't horrible. Who knows. |
08-11-2010, 08:00 PM
| | Registered User
Owner, Bill Fitzmaurice Loudspeaker Design | | Join Date: Sep 2004 Location: New Hampshire | | Quote:
Originally Posted by bassk81976 so, a guy trusts his (probably, i'm assuming considering the AC plug) bootleg Speakon-to-ac-plug speaker cable to a standard 1/4" jack? | Assuming he put it in there before Speakons were available it's a lot better connection than a 1/4" jack. The problem with it is that someone might plug an AC cord into it, then it's bye-bye drivers. A friend of mine put similar rigs onto his 2x15 PA bins and sure enough he plugged them into AC. 110 volts of 60Hz into 15s made a real big noise... for about a half second.  |
08-11-2010, 08:34 PM
| | Registered User | | Join Date: Sep 2008 Location: Sioux Falls, SD | | Quote:
Originally Posted by billfitzmaurice Assuming he put it in there before Speakons were available it's a lot better connection than a 1/4" jack. The problem with it is that someone might plug an AC cord into it, then it's bye-bye drivers. A friend of mine put similar rigs onto his 2x15 PA bins and sure enough he plugged them into AC. 110 volts of 60Hz into 15s made a real big noise... for about a half second. | I'm right with you, my guess is she'd do about 1800Watts worth of halfway between B to B flat for about 1/2 a second. Sure would be quite the PYRO show and the cones would end up looking like a couple of Madonna's Bras.
BOOM
Ya know, I understand why this got done, but really a pair of bananna plugs would have been a lot cooler than stroking up the Milwaukee hammer drill and boring a massive hole in the cabinet. He could have gotten the banannas at radio shack too...
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Last edited by rbonner : 08-11-2010 at 08:38 PM.
Reason: To add a word or two of wisdom
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