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Old 25th May 2014, 12:17 AM   #1
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Default Open Castle -An Experiment

I awoke at 3 am with an idea. Started the project at around 9am, once I had the house to myself.

I'll let the photos do the talking.

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Old 25th May 2014, 12:50 AM   #2
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With cutouts they certainly look better.
Nice table between speakers. Maybe there is a way to integrate drivers into that table, making vintage style, JBL- like speakers.
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Old 25th May 2014, 12:54 AM   #3
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Steely Dan - Glamour Profession; just hit 97.8dBC on the SPL meter in the listening position (~3m) with absolutely no signs of distortion, clipping, or any other "bad stuff". Unreal spaciousness and perfect PRAT.
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Old 25th May 2014, 12:58 AM   #4
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by MisterTwister View Post
With cutouts they certainly look better.
Nice table between speakers. Maybe there is a way to integrate drivers into that table, making vintage style, JBL- like speakers.
I think that table has been retrofitted with some nice speakers already.
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Old 25th May 2014, 12:59 AM   #5
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Quote:
Originally Posted by MisterTwister View Post
With cutouts they certainly look better.
Nice table between speakers. Maybe there is a way to integrate drivers into that table, making vintage style, JBL- like speakers.
That is not a table, it is a vintage Clairtone console, which houses two (original) 12" paper plus AlNiCo woofers which are doing the bass duty in this system via miniDSP (Bessel at 200Hz). The punch is insane.

The center lid opens, and inside I have installed a Technics SL-10, a tube amp, and there is room for album storage.

Last edited by cogitech; 25th May 2014 at 01:10 AM.
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Old 25th May 2014, 01:21 AM   #6
ttan98 is online now ttan98  Australia
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Default High Frequencies peaks

Cogitech,

I heard that the Alpair 10p(I own CHR-70) sounds quite good. However after visiting Bob Brine's website I noticed that this model exhibits high frequencies peaks above 4-5kHz, does your unit exhibits this behavior as well if so did you use and filter(s) to tame them. If not do you find them annoying. A reply is welcomed.

Bob's reference
B10-A10
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Old 25th May 2014, 01:27 AM   #7
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Cogitech,

I heard that the Alpair 10p(I own CHR-70) sounds quite good. However after visiting Bob Brine's website I noticed that this model exhibits high frequencies peaks above 4-5kHz, does your unit exhibits this behavior as well if so did you use and filter(s) to tame them. If not do you find them annoying. A reply is welcomed.

Bob's reference
B10-A10
I have certainly not heard anything that sounds the way that response graph looks. In fact, I have a +5dB high shelf starting at 5kHz to coax a bit more "air" out of mine.

I do plan to measure mine at some point, though. Just have to buy a proper mic.
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Old 25th May 2014, 03:14 PM   #8
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I did some more listening last night and I am really enjoying this experiment. This is my first experience with open baffles so I have no frame of reference, but this quasi U-frame configuration seems to be working in my space. If I put my ear behind the baffle, right near the two drivers, there is definitely some resonance in the curved pocket that I might be wise to eliminate. A few minutes with the jigsaw will confirm that theory.

The girls in the house really like the look of them. WAF is definite higher than the original Pensil. I should also note that I would never have done this to a "finished" pair of boxes, and I would never try this if not for supporting bass drivers and miniDSP. Mostly I was curious how the two pairs of Alpairs would sound in the Castle configuration, and I have been wanting to try OB for a long time.
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Old 25th May 2014, 03:44 PM   #9
xrk971 is online now xrk971  United States
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Ok, I get it now you took a saw to an existing Pensil box which is why there is a port at the bottom. What was wrong with the original enclosure? Are you using the Clairtone woofers in the console for the bass?
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Old 25th May 2014, 04:27 PM   #10
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Originally Posted by xrk971 View Post
Ok, I get it now you took a saw to an existing Pensil box which is why there is a port at the bottom. What was wrong with the original enclosure? Are you using the Clairtone woofers in the console for the bass?
Nothing wrong with the original enclosures other than they were simply not right for me and my rather large room. They were originally built for Alpair 10.2 but I was never truly satisfied with the bass. If I EQed enough for my bass needs, I was regularly running at or near the recommended excursion limits of the drivers, and I don't like to treat them that way. I knew the Pensils were simply not for me, so they never got sanded and finished. I popped the A10Ps in them for break-in purposes and they functioned fine for that, with half-baked bass support.

Recently I got the miniDSP and dialed in a crossover and EQ correction that works really well in my room, with the Clairtone woofers taking everything from 200Hz down. Relieving the A10Ps from bass duty was like a revelation to me; I am a true believer in intermodulation distortion now. When it is absent, it is obvious.

Giving all the bass to the 12" Clairtones also rendered the monolithic Pensil cabinets completely unnecessary. But, what to do with them? The answer was "Open Castle". My love of the Castle configuration started with my EL70 microTowers and I missed that dimension of sound with the Pensils. The opportunity to try OB was simply the icing on the cake.

A10P + A10.2 paralleled for a 4 ohm "Castle", with no bass duty, can handle a ridiculous amount of power without any sign of distortion at all. Talk about headroom.

My plan is to open up the two Clairtone woofer enclosures and turn them into U-frame OBs, then measure their response and tweak accordingly. The "Open Castle" will likely get hacked even more (already have plans to flush-mount the top drivers and cut a large hole out of the upper portion of the sides to reduce or eliminate the "boxy" resonance mention earlier), and at some point I may re-build them from scratch.

My original plan was to build the "CogiCastles" (A10P + A10.2 in Castle MLTL) which I commissioned Scott and Dave to design for me. They may still get made some day, but something tells me that once again I might not be satisfied with the bass...

If I am going to let the Clairtone cabinet have all the bass, then why have the Alpairs in cabinets at all?

Last edited by cogitech; 25th May 2014 at 04:36 PM.
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