[John V]

Hi Max,

I posted about this 7 months ago, here’s the link:

SLOG archives, Looking For a Programmer

If you’re interested contact me off list as noted in the post.

Thanks,
John

[John V]

One other question, does the “spitting/arcing” occur without music playing? If so, this could be caused by dust or particulates trapped between the stator and membrane, it can also manifest itself in form of whistling, buzzing. Generally, this resolves itself on its own. I have experienced this with earlier panel versions although, so far, not with my current Bass Focus 845PX’s.

Another thought, does the music your currently playing contain greater bass energy than that played in the past? If that is the case you might have reached the panels output limits.

Anyhow, I’m only throwing out a few ideas. There may actually be an issue with the panels. That said, the PX panels, as I’m sure Tom will agree, have been the most
reliable of any produced in Soundlab’s history.

[John V]

Hi Tom,

Congrats on your new 845 panels.

I did the same when i upgraded my U790’s.

One thing I did for my frames, and you might consider for yourself, is to have a set of extensions made by Roger’s frame fabricator so the frames now match the height of the new panels.

The extensions have a slotted inner tube that slides into the open top of the frame and neatly finishes the look. The extensions were unpainted when I received them and i had an auto body shop paint them to match the existing finish.

Attached are a few pictures along with Roger’s diagram showing their construction.

Attachments:

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[John V]

Hi,
I’m glad to hear someone else was having a problem, I thought I was only me.
I couldn’t get into the site on 2/23 so I contacted Mark Gilmore, site owner, who responded he was not having a problem. At that point I tried to enter again and was able to do so without issue.

Mark then checked the log files and found anything awry, so he wrote it off to a possible routing issue. Go figure.

John

[John V]

Hi Ralph,

Glad to able to once again participate in the discussions here.
To add a bit to your comments, I was also with you at the Chicago Audio Meeting back in 2006. It was great to meet and spend time with Connie and Roger, first at Brian Walsh’s place, later at dinner that Saturday evening and the following day at the actual meeting. Here are a few pictures from that event.

The first few pictures show a number of attendees, SLOG members, assisting Roger in setting up a pair of M945’s hours prior to the start of the meeting.
The last pix. is of Roger and Connie.
Also, Richard Schramm of Parasound was also in attendance.

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[John V]

@chungjh

The factory does offer a bi-amp option.
Your current backplates can be retrofitted if desired.
I would email Roger for instructions. If your a bit handy
it’s actually fairly easy to do yourself. I did this
myself for my U890’s

John

[John V]

The diffusion ring consists of copper foil that runs around the perimeter of the panel

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[John V]

Hi Ezequiel64,

Could you take a picture of the underside of your backplates?
I’m curious as to how it compares with the backplates for the full
range SL ESL’s.

[John V]

Aside from the turns ratio I’m not aware that any other specs for the AU90 were ever available.
I would contact Rob Mackinlay of ER Audio to see if can supply any
specs. Also, if enough people have an interest maybe Rob would consider doing another run of transformers.

http://www.eraudio.com.au/index.html

[John V]

Hi lotus123,

The rear speakers look like Acoustats to me. Maybe he is running them as surrounds.

Lovely room and system, I like the custom grille color and finish.

[John V]

I’m currently in the process of updating my system. For years I’ve used a Crown Macro and Tact 2.2xp. The Crown, not well regarded in the
High End, but worked well for me over the years.
Anyhow, I’m waiting for a pair of Atma Sphere MA-2’s to be returned from AM for some cosmetic upgrades. As to the pre amp, I just received
a used Anthem STR.
CD/Streamer is next, not sure what I’ll get there.
As to vinyl, I have a Goldmund Reference Turntable that I recently refurbed.

[John V]

Got it, I misread your post. Sorry. It does sound like clipping.
The CLX may be easier to drive than your SL’s. Its also hard to compare your CJ to an OTL amplifier like the MA1.

I ran into a similar situation at one point. I bought a pair of Mac
MK1.2Kw monoblocks, they would not drive my U1’s without clipping.
I guess the Macs couldn’t handle the rising impedance of the SL’s
so I sold them and moved on.

[John V]

Is the other panel operating properly? If so I would try swapping backplates to try and determine it the issue is with the panel or the backplate.

[John V]

When you turn up the bias can you get to a point where the panel crackles?

[John V]

Was the response to you from Dr. West within the past few days?

Thx,
John

[Author]

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