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Multi-Way Conventional loudspeakers with crossovers

Sensitive Wide Range Open Baffles
Sensitive Wide Range Open Baffles
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Old 20th October 2007, 10:00 PM   #1
Magnetar is offline Magnetar  United States
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Default Sensitive Wide Range Open Baffles

These go down to 40 cycles with authority and no eq. They are triamped. Side by side twin RCF 8" mids set up for low inter-channel crosstalk and imaging. Five 10" Madison woofers (.75 QTS), the little 18 sound horn with a B&C compression driver. About 104 db with a watt in the bass (97 or so in the mids)...! Crossover points are 50 to my horn sub, 200 to the the RCF 8's and 2500 to the compression driver. The inside mid is high passed at 1K with a 6 db network to straighten things out a bit.

Sound is fast, powerful and accurate. I'm thinking of listening to them for a while.

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Old 20th October 2007, 10:50 PM   #2
454Casull is offline 454Casull  Canada
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Looks good. Got any pics of the back?
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Old 20th October 2007, 11:03 PM   #3
Magnetar is offline Magnetar  United States
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Originally posted by 454Casull
Looks good. Got any pics of the back?
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Not too pretty - Sandbags anchor them OK
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Old 21st October 2007, 12:00 AM   #4
Pano is offline Pano  United States
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Sensitive Wide Range Open Baffles
Sweet! Dude - you never stop, do you?

I see your tweak caps on the back - clever!


The sand bags are a nice touch.

FWIW: Back when I was touring we used those new "carbon fiber" sandbags. Expensive, but they will hold down just as much but weigh only 1/10th as much as the conventional sandbags. Nice when you don't want to carry all that weight.
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Old 21st October 2007, 12:14 AM   #5
ttan98 is offline ttan98  Australia
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great system, the sound scale must be huge.

future upgrade, you may like to consider separating the woofer from the midrange, the vabration of the woofers will affect the mid range sound quality.
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Old 21st October 2007, 01:38 AM   #6
Brett is offline Brett
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Great work Mike.

Coupla questions;
- did you try a Karlson type coupler on the rear? You mentioned this a while back.
- which RCF's? You may have mentioned this before, but I forget.
- Still not missing horns?

I also really dig the sandbags, barbell weights and the high WAF finish as it reminds me of the amps I build; my brother once asked me if I was ever going to put one in a case.
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Old 21st October 2007, 02:32 AM   #7
tc-60guy is offline tc-60guy  United States
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Hello Magnetar, I love the sand bags! Emperical engenering at its best! No voodoo, just get the job done! How do they sound?
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Old 21st October 2007, 02:41 AM   #8
tc-60guy is offline tc-60guy  United States
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Hello again, Your design might need a vertical brace. It seems a little under structured. Just throwing my two cents in.
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Old 21st October 2007, 02:45 AM   #9
CLS is offline CLS  Taiwan
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I'm quite worrying about those narrow "bridges" around the mids and high. How strong is the ply for such arrangement?
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Old 21st October 2007, 01:24 PM   #10
Magnetar is offline Magnetar  United States
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Quote:
Originally posted by Brett
Coupla questions;
- did you try a Karlson type coupler on the rear? You mentioned this a while back.
- which RCF's? You may have mentioned this before, but I forget.
- Still not missing horns?

Hello- I built a couple of OB's with the Karlson back, it works very well with a low QTS woofer like the Altec 921 or EV 15B , the five ten array doesn't need it. It lowers the low QTS baffles by at least an octave.

The RCF L8S800 - They are like Audax PR170Mo on steroids.
RCF L8S800

As long as I can keep the dynamics uncompromised and radation under control I can be without horns.

Quote:
Originally posted by tc-60guy
Hello Magnetar, I love the sand bags! Emperical engenering at its best! No voodoo, just get the job done! How do they sound?
The sound is pure and fast. It also has tight defined bass that you can feel every note through your body. Very close to to live feeling without much hint of listening to speakers. The new National 4562 OPAMPs in my crossover (over the BB 2134) really helped the sound in the bass.


Quote:
Originally posted by tc-60guy
Hello again, Your design might need a vertical brace. It seems a little under structured. Just throwing my two cents in.
The 'structure' is fine. Having several drivers mounted makes it quite stiff. Where would you brace it?


Quote:
Originally posted by CLS
I'm quite worrying about those narrow "bridges" around the mids and high. How strong is the ply for such arrangement?
Please do not worry. The baffle is very rigid - I would not try and pick it up by the top though.
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