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mlise mlise is offline

diyAudio Member


    Number of Photos: 25
    Number of Comments: 1
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    Disk space used: 11.5MB
    Last Photo Uploaded: IMG_0736.JPG

    Last Comment Posted: waffle
    A really shallow bass cabinet. Front and back are 1/8" Masonite. Seems like a poor idea. I don't understand the upside down thing. I rotated it and it's still upside down.

About Me

  • About mlise
    Silicon Valley
    United States


Total Posts
General Information
  • Last Activity: 25th November 2015 04:00 PM
  • Join Date: 19th March 2007


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Latest Blog Entry

Posted 30th May 2015 at 07:23 AM by mlise Comments 0
Posted in Uncategorized
I have new 2234/35 cones in the 2224H baskets making them into 2234H's. I bought some lead aquarium plant weights to load them up, but broke down and bought genuine JBL OEM mass rings for a mere $85 each. They appear to be zinc (pot metal) so I an be comforted I won't get lead poisoning listening to the speakers. Just have to glue the mass rings in and the dust caps on to make the drivers 2235H's.
The Eminence ASD1001 was my low budget plan for a mid, but I saw 2450J's were actually relatively cheap, so I now have the most modern neodymium magnet version of the 4" diaphragm tweeter JBL makes. The massive ferrite magnet versions cost twice as much.
In this far, I figured I might as well spring for a pair of 2405H's instead of the Beyma clones I already bought. Thanks to e-bay for refunding the first FUBAR pair of 2405H's, I found a second really nice pair.
I wound up air core inductors to make an N7000 dividing network (mid to tweeter x-over) and have the rest...

Posted 24th February 2015 at 07:21 AM by mlise Comments 0
Posted in Uncategorized

Posted 12th June 2013 at 02:33 AM by mlise Comments 0
Posted in Uncategorized
Here's a shot of the waffle all built up. It's 32" wide and 32" tall with the amps on top, and flat. Typically deeper cabinets sound bedder then shallow ones, but the front to back bracing in this seems to fix it. Mica had an excellent suggestion to hinge it to fold in half. That's awesome. With a vertical hinge in the middle, it's all closed and protected to travel. Ron suggested being able to stack them 3 cabinets high for a wall of sound+ effect. Typical amps have basically a point source. The GD's wall of sound had vertical linear arrays (precursor of the modern line array by 40 years) of drivers. With this amp, you could stack them vertically and horizontally to make a field array. if you got closer, it wouldn't get louder, farther away it wouldn't get lamer. Mwaah ha ha ha...

Posted 10th June 2013 at 08:54 PM by mlise Comments 0
Posted in Uncategorized
As seen in the D2 amplifier posting, I had built a pretty normal 4X10 cabinet with Eminence Beta10A's. I was talking to Ron Wickersham up at Alembic, and he suggested an idea he had. Make the cabinets shallow enough that the back pole pieces of the speakers were against the back of the cabinet and vent them outside. Sealed back drivers are problematic in bass amps because they overheat and the coil resistance either goes way up and the sound wimps out, or the coils outright melt. The Beta 10A's are vented and I've even gotten them up to where you can smell the varnish burning off the coils.
Flattening out the cabinet made it quite large. 32" square and only 4" deep.

The frame around the outside is oak, but the front and back are only 1/8" masonite. To firm it up, there are masonite braces front to back radiating from each speaker into the corners and edges of each enclosure....

Posted 10th June 2013 at 08:24 PM by mlise Comments 0
Posted in Uncategorized
I've been working on a lightweight class D bass guitar amplifier. I originally started with the D2 Audio chipset now sold by Intersil.

I found that there was practically no support. Even though I was an FAE at Intersil, I couldn't find any documentation and most of the folks that worked on those parts had been laid off. The D2 parts were great. they had 12 output drivers per chip with a DSP pool, but it would be impossible to actually make a product with them.

Looking around, I found a bunch of parts at TI. I don't know if these came from National or TI originally, but there's a bunch of parts available at different power levels. The all seem to have integrated power stages. I chose the TAS5630. It has an analog input and will drive 300 watts into each of two channels. I ordered samples and started to collect parts to build an initial prototype, but I found complete amplifiers...
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