Best idea. 
R-Carpenter said:
Indeed.
I do suspect that your lovely holey brace is only going to effectively brace that one slice of translam...
To be really effective what is needed is a form fitting brace running vertically that actually contacts each slice,
(The above is just conjecture on my part)
dave
Dave, All in good times. It's not exactly 5 minutes proposition and I am only working on this project on weekends. Would you silicon or epoxy the magnet to the brace?
Salas, the first thing I found under Rock Wool is a hydroponic substitute for planting greens. So I thought it was a good idea to grow so Basile and Tomatoes inside but then after further search I did find some Rock wool insulation. Now you are not talking about just heavy thick layers of wool but this specific Rockwool brand?
Salas, the first thing I found under Rock Wool is a hydroponic substitute for planting greens. So I thought it was a good idea to grow so Basile and Tomatoes inside but then after further search I did find some Rock wool insulation. Now you are not talking about just heavy thick layers of wool but this specific Rockwool brand?
Mineral wool is called Rockwool too. Very common, I am sure you have seen it around hot pipes, in roofs, between walls, everywhere. Some acoustic isolation format example can be seen in this link.
Make sure you get the fluffy surfaced one not the hardened surface type. It itches strongly if allergic, use gloves.
Make sure you get the fluffy surfaced one not the hardened surface type. It itches strongly if allergic, use gloves.
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R-Carpenter said:
That makes it hard to get the driver out. We just use precise dimensions and a bit of spacer if needed.
In an ideal world, one would have a driver designed to put a bolt thru the pole-piece, but i've only ever seen one driver that does that (and i have a pair)
dave
The speaker is in 2 parts and MTM will be separated from the woofer cabinet.
The internal diffraction I was trying to achieve didn't happen. Without dampening the cabinet rang just about as bad as if I'd make it square.
The rigidity of the walls however was quite a bit different. At high volume, walls vibrate allot less then a 1.5” thick flat top. I've added vertical bracing but decided not to attach the magnets to the bracing. I honestly don't see any point in it unless the basket is physically separated from the front panel. The tweeter has it's own enclosure and separated from the mid woofers by about 1.5” thick pocket walls.
Haven't done any measurements yet but put crossovers together with a drop of solder and eager hands.
Only had 3 hours to listen and the first impressions are strange. On Pink Floyd's “Pulse” the speakers disappear and “you are there”. Keith Jarret “Spheres” sounds amazing. Hissing thought out the recording is usually looked at as a defect, here it was obvious that it's the air coming out from organ pipes. Fist time I have heard mechanical clapping of organ on the background. Again there was no speakers, just music. On the “smaller” recordings like Dianna Krall or Holly Coll, it was exact opposite, the sound was coming out from 2 speakers and didn't form a cohesive sound stage. There's quite a bit of cheking and measuring to be done later.
The internal diffraction I was trying to achieve didn't happen. Without dampening the cabinet rang just about as bad as if I'd make it square.
The rigidity of the walls however was quite a bit different. At high volume, walls vibrate allot less then a 1.5” thick flat top. I've added vertical bracing but decided not to attach the magnets to the bracing. I honestly don't see any point in it unless the basket is physically separated from the front panel. The tweeter has it's own enclosure and separated from the mid woofers by about 1.5” thick pocket walls.
Haven't done any measurements yet but put crossovers together with a drop of solder and eager hands.
Only had 3 hours to listen and the first impressions are strange. On Pink Floyd's “Pulse” the speakers disappear and “you are there”. Keith Jarret “Spheres” sounds amazing. Hissing thought out the recording is usually looked at as a defect, here it was obvious that it's the air coming out from organ pipes. Fist time I have heard mechanical clapping of organ on the background. Again there was no speakers, just music. On the “smaller” recordings like Dianna Krall or Holly Coll, it was exact opposite, the sound was coming out from 2 speakers and didn't form a cohesive sound stage. There's quite a bit of cheking and measuring to be done later.
The point is to share the reactive forces of the driver with more than the baffle (typically the weakest panel in the box). The point is to increase the downward dynamic range.
dave
I thought your idea is relative to Linkwitz Orion ++, there he is separating the basket of the driver from the front baffle and making front baffle less of the drum.
Dave, subjectively what is an audible difference between the speaker with attached and unattached drivers? What do you hear and is it clearly audible?
I was thinking of drilling a pair of holes and ¼ 20 with brass screws but scared to drill. I imagine it could be done with drivers that have aluminum backplate.
I was thinking of drilling a pair of holes and ¼ 20 with brass screws but scared to drill. I imagine it could be done with drivers that have aluminum backplate.
the result is greater downward dynamic range... the sound becomes less boxy (the rest of the box has to be designed with the concept in mind) becaue more of the box is involved in killing the driver reactive forces,
dave
dave
Veneer is trimmed, precut to size and joined. In this case I will be using just a bag itself to press the veneer against the MDF. The vertical corners are 4 inch radius and I'd like to have veneer go around, so I can't use Formica or Flex Form. The trick is to use just enough glue and spread it very evenly so it does not lamps up under veneer. I have a good old glue roller with reservoir but a paint roller can be used.
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