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Old 5th April 2011, 01:47 AM   #871
Djim is offline Djim  Netherlands
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Andy, is your cab an 'original' SS15 or did you change it a little?
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Old 5th April 2011, 01:59 AM   #872
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Quote:
Andy, is your cab an 'original' SS15 or did you change it a little?
Its bigger and made out of 3/4 ply. You have seen my posts? Andy
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Old 5th April 2011, 02:02 AM   #873
Djim is offline Djim  Netherlands
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Yes, but I couldn't find a detailed drawing and I wasn't sure you kept yourself to that extension idea.
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Old 5th April 2011, 02:20 AM   #874
jbell is offline jbell  United States
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Quote:
Originally Posted by 4pyros View Post
Here are the unofficial results. I wish it was better down lower but I got a good peak at 180Hz. I am calling it good to make more. Any other thoughts? Andy
Congrats: you made it over the finish line !! AND... you made it your own.

I'm congratulating you on your learning, your design efforts, and your follow through to a finished product.

Now, compare your results to a 'gold standard' http://www.danleysoundlabs.com/pdf/o...ec%20Sheet.pdf and you'll realize how close to gold you got... Yea the gold standard has 40hz above and beyond what a ss15 (and your variant) has... that's to be expected. You are not an industry leading speaker designer.

But for a $250 sub? (assuming you have $100 in baltic per) Holy cow that is close !!

Yea I want more 40hz from the ss15 too, and have agonized over it. In the end -- the agony is probably just not worth it. Getting this close for a DIY effort is in my mind a real feat, and you should be congratulated for getting there.

(now, how much does it weigh????)
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Old 5th April 2011, 02:35 AM   #875
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Quote:
Originally Posted by jbell View Post
Now, compare your results to a 'gold standard' http://www.danleysoundlabs.com/pdf/o...ec%20Sheet.pdf and you'll realize how close to gold you got... Yea the gold standard has 40hz above and beyond what a ss15 (and your variant) has... that's to be expected. You are not an industry leading speaker designer.
Hmm... 40 Hz should be possible. There are some clues in the impedance plot for the TH-115 that suggest how it can be accomplished (basically aiming for a longer path length that results in a lower resonant point of 35 Hz, then fixing the upper part of the passband (~140 Hz?) with some sort of resonator (or "dogfood duct", LOL).

An impedance plot of the SS15 would go a long way in helping to determine how much it differs from the TH115.

You probably won't be able to do all of this with one sheet of ply though
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Old 5th April 2011, 04:21 AM   #876
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did a little more work on it...almost done!
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 5th April 2011, 05:55 AM   #877
FlipC is offline FlipC  United States
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Here is the final result before the start of the night.
Click the image to open in full size.
Did a quick check at opposite end of room which read just over 115 DB. Room width is 112 feet. Setup is 15 feet off rear wall. Wasn't a sine wave. Was using Moby's GO 2006 remix.

It definitely fed my addiction for a bit.
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Old 5th April 2011, 07:10 AM   #878
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man that looks sweet. with subs split at that distance you must have been in power alley territory though. did you think about other stacking arrangements?

ps. i looooove trussing...
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Old 5th April 2011, 08:18 AM   #879
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Quote:
Originally Posted by FlipC View Post
Here is the final result before the start of the night.
Click the image to open in full size.
Did a quick check at opposite end of room which read just over 115 DB. Room width is 112 feet. Setup is 15 feet off rear wall. Wasn't a sine wave. Was using Moby's GO 2006 remix.

It definitely fed my addiction for a bit.
Are these also custom / DIY tops?

Regards, Ben
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Old 5th April 2011, 11:02 AM   #880
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Quote:
(now, how much does it weigh????)
I still need to weigh it. I will get back to you.
Would it make any sense to measure my boxs at 28.3VRMS @10 Meters like Danley dose? Then may be my tests would be more concusive. Andy
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