Born2RockU Posted April 27, 2005 Share Posted April 27, 2005 I was wondering if it is possible to BRIDGE any two of the TEAC AL700P's three channels . Does anyone understand the TRIPATH technology enough to know this would be safe? Quote Link to comment Share on other sites More sharing options...
Vinnie R. Posted April 27, 2005 Share Posted April 27, 2005 Hi, The Teac actually has two Tripath ampflier boards that are 2-channel boards each. They use both channels of one board, and only 1 channel of the other board (3 channels total). Regarding bridging (parallel output), there is a way to modify the board to allow the Tripath 2050 chip to run in bridge mode. If fact, if you do this to both boards, you can make a clean 70W x 2 unit. This tweaking requires some very tricky soldering (surface mount), rewiring, etc... but YES, the chip can be ran in "Parallel Operation," which would give you more power. http://www.tripath.com/downloads/TK2050.pdf Regards, Vinnie Rossi Quote Link to comment Share on other sites More sharing options...
Born2RockU Posted April 27, 2005 Author Share Posted April 27, 2005 Vinnie, You have a email from me. ~Craig R. LeMay~ Quote Link to comment Share on other sites More sharing options...
playntheblues Posted April 27, 2005 Share Posted April 27, 2005 Hey Vinnie, if you bridged the chips, would you still get the same sound just more of it or does that change the whole playing field? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
playntheblues Posted April 27, 2005 Share Posted April 27, 2005 I guess what I'm asking is....would dual monos or bridged sound better? Guy Quote Link to comment Share on other sites More sharing options...
Erukian Posted April 27, 2005 Share Posted April 27, 2005 Well it's more power.. so listening to cannon fire on Telarc's 1812 overture will obviously not clip at super high volumes. From the way I understand the Tripath chips work, bridging wont hurt SQ at all, since they'll decode the same analog channel the same way. But I could be wrong of course. Quote Link to comment Share on other sites More sharing options...
minn_male42 Posted April 27, 2005 Share Posted April 27, 2005 ---------------- On 4/27/2005 9:59:34 PM Erukian wrote: Well it's more power.. so listening to cannon fire on Telarc's 1812 overture will obviously not clip at super high volumes...... ---------------- more power - yes 70 watts NOT clip on the 1812 overture's cannons at "super high volumes" - no at just "high volumes", i can clip my carver pro ZR1000 tripath based amp that puts out 225 watts per channel on those same cannons Quote Link to comment Share on other sites More sharing options...
timbley Posted April 27, 2005 Share Posted April 27, 2005 On a similar note, I read that the soon to be released Panasonic SA-XR55 receiver will have a switch on it that allows the user to bridge the surround amplifier channels for more headroom during 2 channel listening. Pretty cool. Quote Link to comment Share on other sites More sharing options...
Erukian Posted April 27, 2005 Share Posted April 27, 2005 minn, to me at least, if i pass 95-100db then i hit my pain threshold and i get aggrivated within a minute of listening. So to me at least "super loud" is not hearing the cannons blast off at a realistically 150+ dB. Given that I never listen to music with cannon fire, just mostly rock or classical, for me I dont need 500 watts of overhead per channel. BUT if i were to actually set-up a dedicated home-theater 5.1 system, then i'd definately have at least 300-500 watts a channel for overhead while cutting off my mains at about 90Hz and using the sub for anything under that. So i'd never have to worry about actually hitting the max-avaliable wattage. But for my music listening tastes (i dont listen to Telarc 1812 on repeat) it doesnt justify the extra $ for the overhead when 99.9% of the time I never hit it. -Joe Quote Link to comment Share on other sites More sharing options...
Vinnie R. Posted April 28, 2005 Share Posted April 28, 2005 Hey Guy, I never tried bridging the Teac's channels, so I should hold off on commenting on how the TK2050 would sound in parallel operation (single full-bridge) vs. the standard 2-channel operation (dual full-bridge). The "dual-mono" arrangement that you speak of sounds interesting too! This would use BOTH amplifier boards in the Teac, but only one channel per amp board (ie, the CENTER channel and one of the L/R channels). Even in the stock Teac, one could try this vs. using the L and R channels of the stereo board. Has anyone tried this already? Comments? I'll also say that the weakest links of the stock Teac are: 1) The switch-mode power supply (not enough power for the peaks, and adds too much grain to the top-end) 2) That crappy volume pot board on the back, including the coupling caps (sounds MUCH better when you install new RCAs and connect them directly to the amp module via a pair of high quality caps such as Auricaps) 3 A few things on the amplifier modules Regards, Vinnie Quote Link to comment Share on other sites More sharing options...
playntheblues Posted April 28, 2005 Share Posted April 28, 2005 Vinnie, I have only used my Teac as a dual mono, I guess I should try it the regular way and see what diff. I might hear. Buy the way, my first thoughts on the Teac are. Its not perfect however the differences between the Teac and my 6k tube set amp. are not that much! I should have your modded Teac from Guy L. by the end of the week. I sure wish you would figure out a way to have tos link as well as Digital coax inputs on the DAC Quote Link to comment Share on other sites More sharing options...
leok Posted April 28, 2005 Share Posted April 28, 2005 Bridging the Tripath amp gives you 2x the current capability, but the same Voltage capability. So, into the same speaker, the power is not likely to increase at all except at frequencies where the speaker impedance is very low. To get twice the Voltage the unit would require two completely seperate floating supplies (one for each channel) .. and even then I have serious doubts about the feasibility. Leo Quote Link to comment Share on other sites More sharing options...
Born2RockU Posted April 28, 2005 Author Share Posted April 28, 2005 LEO: Do you own a TEAC AL700P TRIPATH amp ? Quote Link to comment Share on other sites More sharing options...
ben. Posted April 28, 2005 Share Posted April 28, 2005 Craig, He designed his own long before it was popular, so I'd take his word on this. Regarding the dual mono- I have mine hooked up that way. Seemed to make more sense than just leaving a board sitting there and running both channels off one board. I've left it ever since, so I have no baseline for comparison. Quote Link to comment Share on other sites More sharing options...
sunnysal Posted April 28, 2005 Share Posted April 28, 2005 leo was MAKING tripath chip based amps before TEAC ever heard of tripath...he knows the subject. tony Quote Link to comment Share on other sites More sharing options...
leok Posted April 28, 2005 Share Posted April 28, 2005 Born2RockU, No, I'm familiar with the technology and have reviewed the applicable Tripath data sheets. Leo Further thoughts: It is possible that Teac provides for increased power supply voltage for bridged mode operation. In this case, the full increase in power would be possible. I haven't re-checked the voltage limit of the output module (Teac uses a 2-module chipset offered by Tripath). My comments here are more a word of caution in that bridging is a fair amount of work and if the power supply voltage really doesn't change it won't accomplish much, if anything. Quote Link to comment Share on other sites More sharing options...
Marvel Posted April 28, 2005 Share Posted April 28, 2005 ---------------- On 4/28/2005 10:01:53 AM sunnysal wrote: leo was MAKING tripath chip based amps before TEAC ever heard of tripath...he knows the subject. tony ---------------- Tony, With all due respect, to you and to Leo, I would suspect that a company like TEAC is working on things long before they ever come to market with a product. Large ships turn slowly. They have the resources, but the little guys can move faster. Marvel Quote Link to comment Share on other sites More sharing options...
Born2RockU Posted April 28, 2005 Author Share Posted April 28, 2005 Ben...so you have which two channels bridged : ~ Left w/ Center ~ Right w/ Center ~ Left w/ Right ...and is the bridged-channel a massive improvement ? Can you possible describe the difference between the MONO bridged-channels and the lonely remaining channel? Quote Link to comment Share on other sites More sharing options...
Vinnie R. Posted April 28, 2005 Share Posted April 28, 2005 All, Looking at the datasheet, it looks like when running paralleled ouput with Vcc = 30V, and driving a 4-ohm load, you'll get a continuous 75W at less than 0.01% THD+N. They don't specify what this will be using an 8-ohm load in this configuration. Also, they don't spec standard stereo operation using an 4-ohm load, but leaving Vcc = 30V, and driving an 8-ohm load, they spec a continuous 35W at less than 0.01% THD+N. I wonder if the spec would match that above if a 4-ohm load was used? I suppose it won't because as Leo mentioned, it is an issue of getting more current (which the paralleled mode gives you). Whenever power ratings are applied, it is always good to know what load is being used, as well as the distortion level. At 10% THD, this amp has a lot of power ;-). In the end...what's more important than the rated watts is how it sounds. I'm sure we all can agree on that! Regards, Quote Link to comment Share on other sites More sharing options...
Vinnie R. Posted April 28, 2005 Share Posted April 28, 2005 ---------------- On 4/28/2005 10:52:58 AM leok wrote: Further thoughts: It is possible that Teac provides for increased power supply voltage for bridged mode operation. In this case, the full increase in power would be possible. I haven't re-checked the voltage limit of the output module (Teac uses a 2-module chipset offered by Tripath). My comments here are more a word of caution in that bridging is a fair amount of work and if the power supply voltage really doesn't change it won't accomplish much, if anything. ---------------- Leo, It looks like the TP2050 chip can run up to 36V (recommended max), with an absolute max rating of 40V. I don't think this limit changes if the mode of operation changes...at least they don't specify it. Regards, Quote Link to comment Share on other sites More sharing options...
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