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In Reply to: RE: This is hypothetical..., posted by Ralph on May 10, 2012 at 09:17:22
The two transformers are definitely some form of EQ.
The bass transformer is wound with very thick wires and when they are played full range to drive the whole Soundlab panel, the natural roll of is around the 500 Hz (my ears tell me). There is no highs what so ever.
The mixer does the rest of the EQ work by bring in another transformer to perform the high frequency work.
The above is quite smartly done by obviously varying the turn ratio to give a balance sound.
Without EQ, direct drive amps straight onto the panels would only yield sound without much bass. Similar to vinyl without RIAA.
Well i have had the Acoustat ESL direct-drive OTL amps ....an sold them..for the tranfourmer type setup....now you all are just talking as if this well be the best thing for your soundLabs....this is where i get off...
You still have a lot of work YOu can do... too get the better sound out of your ESLs....but i gess it ezer to look away from the work to....well dreams
It just one thing to the next with most..It just like doing all the MoDs to a OTL.. till it sofar away from where it was in the stock setup no one knows where you are...or what you have.. not even you ....but it GOT to be better...i have done this also but i STOPet....it means nothing...Well it means you always Lost...not for me..goodluck
Direct-drive amplifiers have never been my cup of tea either! Making the kind of power you need for something like a Sound Lab sounds really scary...
OTLs....ESLs....on paper..look just right..in real life not so much...Amp get Hot as Hell an EAT AC power..ESLs can be Big...there not for eveyone....love to see a 6SN7 criltron preamp setup i could DIy would look like on paper....hint,hint...look it your work so...
ESL are all about there bias...bias bias bias, the way this is setup has a big afect on the sound..One thing i have said over an over is Dr West lets you set you own bias an this is a goodthing... but what dose he have in the speakers.. high V..or Low V tranfourmer ...like 1000v on the secdary side... thin the diodes.. or 300v an how about the Amps of the tranfourmes... i have seen ESL bias Xfourmers that were 1VA....a better one like 1000-1500..Then the doides.. 5-7VA xfourmer sounds way better...An better caps in the bias setup...but most just think well it just bias...better bias can give more output.. an way better base...An sweeter highs i have found...An it a eze fix...goodluck
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