Serenity Super-7s back in my system

Planar Speaker Asylum

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Posted by jeffreybehr (A) on January 30, 2016 at 23:02:43

Some of you will remember reading my blurbs about these a couple years ago.

photo 2014Nov11_musicroom_1500w_zpsc13eed7e.jpg

They've been in my system (and loved) and then been replaced by my older, much-improved Audio Physic Avanti IIIs, and then back in, and then back out. Had an audio-club meeting this week and took my Avanti IIIs, and decided to reinstall the S7s while the Avantis were out. I had done this a year or so ago and found the S7s to be distinctly unlively--as in almost dead--and couldn't figure out why, so I parked them on the 'storage wall' again...until yesterday.

Found out why they were dead sounding last year--the tweeters are 45" off the carpet which is much higher than my ears, and the vertical dispersion of treble is rather small. Hence the tops of the speakers needed to be tilted toward the listener for a relatively accurate frequency response. I did that and WOW what a difference, so in the system they'll stay.

Have decided to keep these and improve some crossover parts, which is really easy since each is parked right there in front of my face. Following is the original x-over.

A year ago or so I had ordered and received all parts I wanted to replace then, so yesterday I confirmed some parts-and-wiring-upgrade info and got more from my buddy Jeffrey Glowacki of Sonic Craft. Today I installed those parts I had, as follows.
1. The tweeter hi-pass filter is a 10uF series cap followed by a 0.39mH choke in shunt. Replaced the original SoniCap 'propylene plus tiny Teflon bypass cap with a combination of two SoniCap Platinums (a 6.8 and a 3) totaling 10uF.
2. The MR lo-pass filter is a 1.0mH series choke followed by a 15uF shunt cap. Replaced the choke with a Goertz/Bridgeport copper-foil inductor.
3. A midrange-compensation network (in shunt) includes a 3.0mH choke and a 56uF combo cap (Erse Pulses), and a 12w. Mills MRA wire-wound resistor which I'm not replacing. Replaced the cap with a 56uF combo of SoniCap 'propylenes and a 0.33uF SoniCap Platinum I had.
4. Will order replacements for the other two pairs of chokes.
5. Haven't decided what to buy for the 15uF MR-shunt cap...maybe a Mundorf Supreme.

Will rewire the panel and X-over with something excellent; just haven't yet decided what.

Here's the very-work-in-process x-over tonite.

Speaker rewiring will be continuous to the solid-silver-in-Teflon speakercable.

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Topic - Serenity Super-7s back in my system - jeffreybehr 23:02:43 01/30/16 (14)

Did more crossover work. - jeffreybehr 17:12:55 02/17/16 (3)

RE: Did more crossover work. - Satie 22:08:05 02/17/16 (2)

I don't understand your question--'microphonic noise'? (NT) - jeffreybehr 10:27:41 02/18/16 (1)

RE: I don't understand your question--'microphonic noise'? (NT) - Satie 11:19:13 02/18/16 (0)

RE: Serenity Super-7s back in my system - pictureguy 09:25:08 02/14/16 (0)

...and they're getting a little more 'Superer' sounding... - jeffreybehr 16:23:21 02/10/16 (4)

RE: ...and they're getting a little more 'Superer' sounding... - Satie 11:29:22 02/13/16 (3)

The granite tiles I found were very acoustically dead. - jeffreybehr 15:47:55 02/13/16 (2)

RE: The granite tiles I found were very acoustically dead. - Satie 21:31:41 02/13/16 (1)

I'd have to build ladders for me AND my dog. :-) (NT) - jeffreybehr 22:04:15 02/13/16 (0)

Replaced the 15uF MR-shunt cap with... - jeffreybehr 11:34:27 02/3/16 (0)

nice...I just want to know - Green Lantern 23:08:33 01/30/16 (2)

And would you ask a chef what brand of pots and pans he/she uses? :-) - jeffreybehr 11:01:08 01/31/16 (1)

grazie : ) nt - Green Lantern 13:05:33 01/31/16 (0)

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