Daddy Dee Posted February 14, 2007 Share Posted February 14, 2007 I'm wondering if it is safe to use a mini-box to sum the L and R channel from a Super T amp. Some time ago on the forum, I read some posts warning against attempting to bridge a T amp. I didn't grasp the technical issue as to why that was a bad idea, but got the message o.k. This warning came to mind when considering the thought of using a minibox to derive a center channel. Any advice appreciated. Quote Link to comment Share on other sites More sharing options...
DrWho Posted February 15, 2007 Share Posted February 15, 2007 I want to say that you'll be just fine - but don't quote me on that. Is there any chance that you can just build a line-level version and avoid the issue altogether? Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted February 15, 2007 Share Posted February 15, 2007 I want to say that you'll be just fine - but don't quote me on that. Is there any chance that you can just build a line-level version and avoid the issue altogether? Bridging two channels of an amp is not the same thing as using a center channel box. In the later, the two sides do not "see" each other since there is a resistor in between. So Mike is probably correct. Besides, he will promptly and cheerfully repair any damage that might occur. -Tom Quote Link to comment Share on other sites More sharing options...
sfogg Posted February 15, 2007 Share Posted February 15, 2007 The only thing I'd watch out for is I think the Tripath amps don't have a common ground. The speaker level minibox probably wouldn't work with that. Shawn Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted February 15, 2007 Author Share Posted February 15, 2007 That is interesting that the line level minibox would be o.k. Also, that the resistor between the channels provides enough of of a (what?) to prevent a problem. The "no common ground" issue makes sense as the source of the problem. Quote Link to comment Share on other sites More sharing options...
Deang Posted February 15, 2007 Share Posted February 15, 2007 I'm going to use two Super-T's with the Jubilee. Scary huh. Quote Link to comment Share on other sites More sharing options...
sfogg Posted February 15, 2007 Share Posted February 15, 2007 Dean, "I'm going to use two Super-T's with the Jubilee. Scary huh." Nope. Amps have it easy when they don't have all those reactive components between them and the speaker. You also effectively have more power that way since there are no losses/attenuation in a passive crossover. Shawn Quote Link to comment Share on other sites More sharing options...
sfogg Posted February 15, 2007 Share Posted February 15, 2007 "Also, that the resistor between the channels provides enough of of a (what?) to prevent a problem." They are basically a passive mixer. They add loading to the circuit to lower crosstalk between the channels. With the minibox you will end up with some loss of channel separation. Shawn Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted February 15, 2007 Share Posted February 15, 2007 The only thing I'd watch out for is I think the Tripath amps don't have a common ground. The speaker level minibox probably wouldn't work with that. Shawn Yikes, I forgot about that detail. I had assumed they were a common ground (I mistakingly once made that asumption about a car radio once and .....). Fortunately, I had already volunteered Mike to fix any damage that might occur. -Tom Quote Link to comment Share on other sites More sharing options...
DrWho Posted February 15, 2007 Share Posted February 15, 2007 lol - that's why I didn't want to be quoted on it! Can't the mini-box be built differently to accomodate the difference in ground? I still think the line-level approach would be easier and cheaper - provided it hasn't already been built yet. Quote Link to comment Share on other sites More sharing options...
sfogg Posted February 15, 2007 Share Posted February 15, 2007 I am not positive that the Tripath amps outputs have separate grounds, but I seem to recall reading that somewhere. Easy enough to check with a multi-meter..... Shawn Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted February 15, 2007 Author Share Posted February 15, 2007 I'm going to use two Super-T's with the Jubilee. Scary huh. Dean, yeh, scary good! That should sound fabulous with Jubilee. Some time back, after reading some of your posts, I got interested in the Super T and have been using it in a system driving Heresy II's and the sound is excellent. You are right, this amp is a sleeper. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted February 15, 2007 Author Share Posted February 15, 2007 lol - that's why I didn't want to be quoted on it! Can't the mini-box be built differently to accomodate the difference in ground? I still think the line-level approach would be easier and cheaper - provided it hasn't already been built yet. This is an interesting question. I have wondered if the Dynaco QD2 might be a safe option. It takes two speaker level signals and derives a center AND (if desired) a L rear and R rear. Quote Link to comment Share on other sites More sharing options...
Tony Reed Posted February 16, 2007 Share Posted February 16, 2007 So what's the verdict? Is it safe to use a mini box with the Super-T? I don't quite understand this common ground thing. Tony Quote Link to comment Share on other sites More sharing options...
Deang Posted February 16, 2007 Share Posted February 16, 2007 I think the verdict is that it's O.K. to use it with the line level version but not the speaker level version. That silly little amp sounds as good as anything I've ever heard. Quote Link to comment Share on other sites More sharing options...
DrWho Posted February 16, 2007 Share Posted February 16, 2007 All this hoopla I'd love to give one of these amps a try. Any chance I could borrow/rent one from somebody? Temporary trade? Or maybe I don't want to know how they sound for fear of not being able to purchase one, lol...but seriously, they couldn't be that expensive to ship could they? Maybe in the process I can "tear it apart" and see if you can't easily get around the common ground thing. Quote Link to comment Share on other sites More sharing options...
Rivendell61 Posted February 19, 2007 Share Posted February 19, 2007 I'm going to use two Super-T's with the Jubilee. Scary huh. Get 'em while you can: http://biz.yahoo.com/e/070214/trphe.ob8-k.html Mark Quote Link to comment Share on other sites More sharing options...
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