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Post by petegalaxie on Oct 6, 2010 6:48:01 GMT -7
How do I do this? I have a Galaxie 2X10 combo with a Brake Lite installed. I'd like to add in an 8 ohm extension speaker cabinet (maybe a 1X12, maybe a 2X12) but how can I connect both the 2X10's AND the extension cabinet to the Brake Lite?
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Post by benttop (Steve) on Oct 6, 2010 6:59:08 GMT -7
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Post by petegalaxie on Oct 6, 2010 7:35:59 GMT -7
Steve, I assume this would plug into the output of the Brake Lite, the "combo" speakers would plug into the female connector and the male connector would plug into the extension cabinet. What does this do to the ohms? The Dr. Z 2X10's are 8 ohms and if I add an extension cabinet with an 8 ohm 12" speaker using this type of cable, am I now connecting these in series (total = 16 ohms) or parallel (total = 4 ohms) and is this okay for the amp? In both cases, how would that affect the sound? Thanks! Pete
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Post by benttop (Steve) on Oct 6, 2010 11:41:23 GMT -7
Well the Galaxie apparently has a substantial transformer that can take the added load. Ideally you would want to hook them in series so that the impedance goes up to 16 ohms, but I've seen Dr. Z say here that the amp will tolerate a 4 ohm load without problems, so the choice is yours. I know Todd will build that cable either way, so you have to decide what you want to do. The common build is parallel though.
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Post by petegalaxie on Oct 6, 2010 14:56:32 GMT -7
Steve, Thanks for all the info! (This is a GREAT forum!!!) Would another option be to get myself another Brake Lite, say the Brake Lite SA Stand Alone Attenuator? The Brake Lite installed in the combo would be used as-is for the 2X10's. Could I then just use the additional Brake Lite between the Ext. Speaker output from the back of the amp and the 8 ohm extension cabinet? I'm not sure if this will give me a total of an 8 ohm load. Would this be better for the amp? I've also seen here on the forum that the Galaxie transformer can handle the 4 ohms, but was wondering if 2 Brake Lites would be a "better" option? I read ( drzamplifiers.proboards.com/index.cgi?board=galaxie&action=display&thread=34851) that when the extension speaker out is used, it is really a parallel connection anyway and the result is 4 ohms. Do you know if this is true? Would the series option on the Y cable give me 8 or 16 ohms? And would that be "safer" for the amp, other than the damage that can be caused if one side is left unplugged and the amp turned on. I'd hate to damage the amp. Pete
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Post by benttop (Steve) on Oct 6, 2010 21:49:31 GMT -7
Steve, Thanks for all the info! (This is a GREAT forum!!!) Would another option be to get myself another Brake Lite, say the Brake Lite SA Stand Alone Attenuator? The Brake Lite installed in the combo would be used as-is for the 2X10's. Could I then just use the additional Brake Lite between the Ext. Speaker output from the back of the amp and the 8 ohm extension cabinet? I'm not sure if this will give me a total of an 8 ohm load. Would this be better for the amp? I've also seen here on the forum that the Galaxie transformer can handle the 4 ohms, but was wondering if 2 Brake Lites would be a "better" option? I read ( drzamplifiers.proboards.com/index.cgi?board=galaxie&action=display&thread=34851) that when the extension speaker out is used, it is really a parallel connection anyway and the result is 4 ohms. Do you know if this is true? Would the series option on the Y cable give me 8 or 16 ohms? And would that be "safer" for the amp, other than the damage that can be caused if one side is left unplugged and the amp turned on. I'd hate to damage the amp. Pete Whoa, that's a different approach! Lessee here... Offhand I can't say if running parallel Brake Lites is a good idea or not. My gut feeling is that it would be ok, but that you don't really need to go to the expense. The down side of course is that you would have to switch two different devices to adjust the volume. Since Dr. Z has already said he's certain the Gal can take a 4 ohm load, instead of using the extension speaker jack on the amp, get the Y cable. Plug the Brake Lite into the amp, then take its output to your two cabs via the Y cable. The result is 4 or 16 ohms depending on how you have it wired, and all questions fade to the background. I'm pretty sure that cable is less money than a second Brake Lite too. Then of course you only have to turn one knob to adjust the volume. Edited for clarity - sometimes my brain gets ahead of my fingers...
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Post by petegalaxie on Oct 7, 2010 6:51:02 GMT -7
Steve, Thanks again for the "sound" advice. I agree that the Y cable is the way to go. Appreciate it! Pete
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