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Old 10th April 2018, 06:19 AM   #2481
navin is offline navin  India
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Quote:
Originally Posted by mikey_audiogeek View Post
Attachment 673948
Seas FA22RCZ + P.Audio SN15B
MiniDSP biamped
Brilliant!
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Old 11th April 2018, 05:05 AM   #2482
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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Originally Posted by gapmedia View Post
Thanks. Copy I hope.
Scando Coffee Table
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Old 11th April 2018, 05:08 AM   #2483
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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Quote:
Originally Posted by kazap View Post
Click the image to open in full size.

Dam. That's a superb looking design. Downright elegant. Is that a Kiwi original?

But how rigid is it? It looks like it would have high resonance in the Z plane to play its own tune. Better stick an accelerometer on it.
Thanks!

Resonance... hoping these will help... Buy Pocket/Solid Dive Weight online at Marine-Deals.co.nz
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Old 20th April 2018, 05:41 PM   #2484
6thplanet is offline 6thplanet  United States
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Very clever use of that table, I like that a lot!
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Old 21st April 2018, 03:22 AM   #2485
kazap is offline kazap  Australia
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Quote:
Originally Posted by mikey_audiogeek View Post
Brilliant! Classic Kiwi lateral thinking turning the tables.

Lead mass damping with the diving weights is smart. Id use sand bags myself. Cheaper. Easily recycled into the garden at the end of the project. Non toxic. Better able to absorb resonance vibrations.

I wonder where the best mounting points are to attenuate resonance? I guess there will be two types of resonance. One is a rocking of the entire upper panel around the lower bend forward and back. To dampen that the lead could be mounted as high as possible to inrease the lever arm and rotational inertia. The second might be higher frqiency modes of the panel. Mounting the bags on the panel at modal points with good coupling should work.

Can you do some measurements?
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Old 12th May 2018, 04:39 AM   #2486
pcgab is offline pcgab  United States
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Recently I had the incredible luck of having an Altec 1505b and 288c fall into my lap for next to nothing.

The driver needed a new replacement diaphragm, so I ordered one from GPA, cleaned the compression driver, bug screen, etc. and put in the new diaphragm.

Always wanting a better system in my workshop I decided to build a mono rig there with the 1505b/288c covering ~500hz - ~8000hz, an alnico JBL 2402 handling ~8000hz and up, and 4 Alpha 15a's (series parallel) in a ~48"x48" baffle.

I am using a UTC A-20 to mix L and R signals from my iphone (streaming from Tidal) into a single mono signal. That's currently being fed into a Crown D-45 that's driving the rig. I plan to build a tube powered amp for the 1505 and 2402 combo and likely keep the crown for the open baffle.

The crossover is still being tweaked, hence all the wires, resistors(l-pads) and jumpers dangling all over the place.

I am very pleased with the sound, and frankly surprised how much I'm enjoying it. I may add side wings to the baffle, there is a small top 'wing' I added, mostly to mitigate dust falling down into the back of the 15a's.

The long beam going up on the left side of the baffle is a support that goes to the ceiling. I didn't want to put a support from the back of the baffle to the wall behind it as that would make it difficult for me to get back to my clamp storage
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Last edited by pcgab; 12th May 2018 at 04:41 AM.
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Old 13th May 2018, 12:05 AM   #2487
MITsound is offline MITsound  Canada
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I've come to love efficient speakers and small amps. There's some magic in sound from 15" drivers, it seems to set the table, rather than spraying things into the room.

That makes my 511B pair look puny!
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Old 16th May 2018, 05:27 AM   #2488
MITsound is offline MITsound  Canada
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Default Open back baffle no baffle

Air mass loaded Neo 10, with series connected Neo 3/Neo 8.
Crossover points 2500hz, 325hz. Spare parts project, wanted some tiny satellites, and some headroom with 10 watt amps.

These work far better than expected, with corner loaded Onkens as bass bins.
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Old 16th May 2018, 10:35 AM   #2489
JonasKarud is offline JonasKarud  Sweden
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Here's some pictures of my new dipole tweeter. The membrane is made of 8 uM alu laminated to Mylar. Usable frequencies: 1,5 to 35 kHz.

It took me 3 years to come up with a method to produce perfect 5 ohm tracks!

The membrane is only attached at the short sides, which lowers the distorsion.

Cool possibility: Using the visible ends of the red protecting rods to indicate date of production in binary form!
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Old 16th May 2018, 12:22 PM   #2490
perceval is offline perceval  Taiwan
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That is pretty cool!

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