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The 63s will run off two modified LEAK Stereo 20s, strapped and high-pass filtered at 150Hz

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Timbo in Oz

In Reply to: RE: I would certainly not expect to hear nuances and small changes. posted by PakProtector on August 24, 2016 at 13:45:11

40 watt mono-blocks, 4 ohm taps for both OPTs, giving a 'strapped OPT tap' of 2 ohms.
To retain the QUAD's impulse response the filters are high quality first order Passive Line Level inputs crossovers inside the amps.
I don't think the LEAKs will be working very hard.
I do not expect that system to clip. That's for the colder months.
And in Summer they will be driven by a nice big rebuilt Perreaux 6000C, again with passive 150Hz 1st High-Pass input filters.
Bass? 4 or 5 distributed DIY subs driven by a total of about 600 watts LP @ 150 Hz 3rd order, and analogue Eq'd - for now - by 2 to 4 1/3rd octave equalisers to get down to 20Hz if possible. ? Two big stereo power amps and two integrated amps.
Again, I don't expect much clipping, even though I do like to listen loud. :-)!
I'm not big into Rock music and not big into Mahler, I'm mostly into HIP classical.
I listen to live acoustical music about once a week, mostly choral with organ, and some chamber and chamber orchestra.
I used to record concerts for later broadcast on FM, and intend to go back to it.
As I'm a pensioner this has all taken time, a bit of money each month.
But we are now close to the first install, with an interim bass array of two boxes and 4 spherical encl. Giving 2 9" and 4 8" bass drivers - all getting down to 35Hz. That will keep us going and get my wife happy.
Yet to finish? two clam-shell P-P sealed subs (boxes are built), then build two TL subs with KEF B139s. I already have a large RB sub with a dedicated locally mfd long-throw 10inch ELF driver.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

Edits: 08/24/16

Follow Ups:

KEF B139s in TL cabinets - Lew 11:10:00 08/27/16 (0)
Tim, that's what I use as woofers to go with my Beveridge 2SW speakers, which cross over at 100Hz. I use a Dahlquist crossover just to provide the low pass filter, and I drive the TLs with a vintage Theshold Stasis 50W amplifier. I built my TL cabinets 40 years ago as the basis for a 3-way system, sold them after several years and then bought them back from the guy who owned them, after many more years. They are about 4.5 feet high, 20 inches deep, made of 1.25-inch MDF and veneered in formica, modeled on the Bailey formula published in Wireless World. I had them stored in my basement ever since repossessing them, until 3-4 years ago, when the Beveridge speakers came into my life. There were many moments over the years before I bought the Bevs when I contemplated trashing the cabinets and selling the NOS KEF woofers that I had kept around for the sole purpose of using them in the TLs. I am so glad I did not do that. The TLs mate very seamlessly with the Beveridge sound. They will be a perfect mate for your Quads, too.
Tim, The system will only be as good as the modded Leak Amps - drlowmu 00:29:46 08/25/16 (1)
On the Leak schematic, R21, 100 Ohms of series resistance, in the B+ filter to the Finals, needs to be avoided at ALL costs.

Suggest you PSUD2 a " Flywheel " B+ filter, as per THIS Forum, maybe eight years ago. ( L1/C1/L2/C2 ) Ls are 1 and = < 20 Ohms DCR. Easiest author to read on Flywheel supplies is Forum Member John L. Hasquin, and a good second choice is John Swenson, both are EEs and better yet - smart in audio.

You system will only be as good as your amps !!

That is where SETs can shine, IF done right, most are not, for sure Simplicity rules in audio design. You are listening to an extra ( 3rd ) stage, a phase inversion, and two coupling caps in series, that any good SET amp easily avoids.

Have FUN !

Jeff Medwin
- Go away Geoff. - Timbo in Oz 03:19:38 08/25/16 (0)
  My amps are fine.
  
  Warmest
  
  Tim Bailey
  
  Skeptical Measurer & Audio Scrounger

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