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In Reply to: RE: I tried it with a 24uF cap and sounded horrible posted by Penguin on June 06, 2012 at 18:12:52
How were you able to tell the cap was too big? What did it sound like?
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:)
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
And taking the cap out sorted that out??
But putting back the 8 ohm resistor in parallel with the torrid and the 36 uF in series.Dee
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Edits: 06/07/12
So - reinstalling the original parts is what worked?
which makes me confused again...it seems like i am getting confused left and right by this thing....after all there is no DC going into the torroid from the apm, there is a series cap in there, unless there was something wrong with the cap i was using....but it measures 23.64 uF does not show a short or any issues...I am using the Llano in a vertical bi-amp. I have two stereo units. but if they work with the normal 36 uF (really big ass oil cap) 8 ohm high pass filter in form of the torroid, it should work without it, unless there is something very strange is going on. I will keep looking at and try just lifting the resistor off the ground so only the 36 uF cap is in series. but not tonight. Now i only did one of the backplates...maybe i will try the other one and see if there is a difference.
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
It might be that the higher impedance of the speaker is limiting the power of the amps. Solid state amps can double power as the impedance is cut in half which is another way of saying that if you double the impedance the power is cut in half. That is why tube amps are usually preferred on Sound Labs- they don't loose so much power into the higher impedances (so you have power to play the bass).
It might be that you are simply clipping the amps?
Interesting. the beast can put 300W/channel into 8 ohms and double when going down to 2 ohms to 1200Ws has more FETs in it than a doughnut shop has cops...but let's say it could only put out 35 w into 64 ohms? due to maxing out to the rail voltage? but even 35W would be really loud, would it not be? And i was not changing the volume. between resistor in and out..It would almost seem that this mod would make the speakers SS amp unfriendly, right? What puzzles me is why does the distortion go away when i put back the BAR (Big Ass Resistor)
Should i just say screw it take out the resistor, put the MA-1s in place and never look back?
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
I put this idea on SLOG a few hours ago. It is possible that your SS amplifier is unstable when asked to drive the capacitative load of the SL speaker without the resistor in the circuit. This has nothing or very little to do with its power capability. Some SS amplifiers decompensate when asked to drive such a load. The presence of the resistor in the circuit ameliorates the capacitative nature of the SL speaker, over all. (I believe that Dr. West even gives this as one reason not to remove the resistor.) When you remove the resistor, the speaker becomes, essentially, one huge capacitor. SS amps don't like to drive capacitors. One notable example is Krell, maybe not the current models, but in the old days they were notorious for shutting down when driving ESLs.
On SLOG, I suggested you might try to borrow a Parasound or Pass amplifier. Both of those are probably OK with the capacitance of the SL speaker load. Later I thought maybe you might try horizontal bi-amping, instead of vertical. Just for the heck of it.
blow the dust off the MA1 and put it in service. I like the sound of the tubes better anyway
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
I am not buying the Amp SS or tube not working....
From the work i have done on All ESLs.....in these setup of the high frc tranfourmer..With the res. Caps.in front an then caps in the mixer....this sets up a push-back to the amps Tube are SS... Not with this new mod..pulling the res. an cap OUT....this is OVERCOME...now i have a pr of 50watt amps driving my set today....thay have NEVER sounded so good as with this mod..before the mod...i could not get the speakers play with 500watt amp... like thay sound with 50watts ...gofig
But however all a esl is Bias...heres a way to test an get the right bias on Any ESL...
put a 2ohm 20 watt res. in the neg input leg of the base tranfourmer... then setup you speaker like you play them get you bias set like Dr. west tell all to do then play cds an the after 10 min...tuch the res.. if the bias is low the 2ohm res well be hot...if all is well the res. well just be worm...
this has work for me for years....the res. was put in to the Acoustat to help with the base tranfourmer overlode..the res get hot not the tranfourmer...Play my setup loude... 2ohms get just worm.....goodluck
Edits: 06/09/12
Maybe :)
I think those that are on the SLOG forum can say better, but as I understand it this mod is helpful for solid state amps too, as the resistor is absorbs substantial amplifier power.
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