Someone needs to design some kind of enlarging/shrinking circular shaped ring/strap, driven by some kind of hand crank, to allow quick mount/dismount to measure drivers…
The analogy for rectangles is a bench vice…
Making new baffles just to measure is a PITA…
Also a pop up test unit
(Turntable, audio interface, mic + stand, I/O cables in one)
You’ve heard of pop-up tents when you go camping…
The analogy for rectangles is a bench vice…
Making new baffles just to measure is a PITA…
Also a pop up test unit
(Turntable, audio interface, mic + stand, I/O cables in one)
You’ve heard of pop-up tents when you go camping…
Last edited:
The Visaton frs 5x is a nice driver, that is just about 86dB. It is very smooth with a gently rising response
Turns out it mounts in a 2.25" hole diameter, but the terminals still need notched. I'll have them in a 0.13 ltr chamber by way of 2" PVC coupler and attached shallow 2" PVC cap. For whatever the reason, HD cap selection are only about 1" thick in this size. That was not enough volume, and the driver will not install into a 2" PVC pipe diameter.
The AP2 takes a #4 flush head mounting screw.
The AP2 takes a #4 flush head mounting screw.
Have you ever looked into using pots for flowers/planters for midrange enclosures?
Tapered cylinder shaped, truncated on one end, other end closed.
Often have pre-drilled holes at the bottom, allows cabling to pass through.
Sturdy ceramic construction
Manufactured in high volumes thus very economical.
Tapered cylinder shaped, truncated on one end, other end closed.
Often have pre-drilled holes at the bottom, allows cabling to pass through.
Sturdy ceramic construction
Manufactured in high volumes thus very economical.
The size of the pots were too large or too small in this case. The magnet on these was too large and the volume not large enough in the smaller one, and the size was too large in the next. It's a delicate balance of volume in something this small... More on this particular project in the upcoming build thread...
Measured T/S, sealed and stuffed, and an aperiodic multichamber sealed box:
Measured T/S, sealed and stuffed, and an aperiodic multichamber sealed box:
Attachments
yes, and if some rare 3" can handle it with THD low enough, the Sd is still too little imho... sound is closed if a cone and just ok for strong 3" dome ATC/Volt/Neumann only (PA drivers). If you lowish the filter slope, the bottom driver will help but the widther overlapp will come with more THD... All is about if the average playback spl in room is low and sweet spot close enough, imo. 70 dB ?
IIRC the most powerfull was the ATC 2" and that 500 hz was more intented for its 3" big brother !
So a 2" is certainly more 900/1000 cut-off... and/or very steep filter and low spl playback...
If not said already in the thread, I would have a look to the last T. gravsen design with the new SB Acoustics 2.5" dome... Although big front plate ! I assume he perhaps cross it around 800/900 hz, although I do not remember if with his usual LR12 or more acoustically.
Last edited:
Wolf and Augerpro, these fellows have measured and designed more speakers than I've forgotten to measure or design.
I think Brandon is on the hunt a specific use case for an upper midrange / low mids
The impedance sweep looks very similar to the datasheet, I suspect the FR will be too.
What I see is that Vd and power handling to will limit the SPL on the low end. About 99dB@1m it's both thermally (20W) and excursion limited (0.5mm xmax) at 700Hz.
Could someone page Dennis Murphy, I think Ben's confirmed a higher sensitivity driver than the Tectonic BMR 2.5" TEBM46C20N-4B
I think Brandon is on the hunt a specific use case for an upper midrange / low mids
The impedance sweep looks very similar to the datasheet, I suspect the FR will be too.
What I see is that Vd and power handling to will limit the SPL on the low end. About 99dB@1m it's both thermally (20W) and excursion limited (0.5mm xmax) at 700Hz.
Could someone page Dennis Murphy, I think Ben's confirmed a higher sensitivity driver than the Tectonic BMR 2.5" TEBM46C20N-4B
Last edited:
@tktran303 that's correct, and I also require close driver spacing. Dome mids tend to be very large diameter, except maybe the Bliesma but those are totally outside the budget.
Dome mids have poor dispersion at 4KHz.
The flat piston or cone is better.
I’m a bit puzzled by theIr alleged appeal. It is really a renaissance, or only because ATC have left the small (3”) hole in the market.
The flat piston or cone is better.
I’m a bit puzzled by theIr alleged appeal. It is really a renaissance, or only because ATC have left the small (3”) hole in the market.
New one, though price is a bit steep....
https://www.parts-express.com/Tectonic-TEBM54C30-8-2-1-2-BMR-Full-Range-Speaker-8-Ohms-297-2176
https://www.parts-express.com/Tectonic-TEBM54C30-8-2-1-2-BMR-Full-Range-Speaker-8-Ohms-297-2176
With the last driver was sold for peanuts.
Besides, Dayton RS225-8 is now US$90.
RSS reference series woofers even more expensive that Peerless XXLS.
Perverse universe…
Besides, Dayton RS225-8 is now US$90.
RSS reference series woofers even more expensive that Peerless XXLS.
Perverse universe…
And some results...
These are taken on axis in the baffle of my upcoming 'Bottleships' design, with the MAPD multichamber aperiodic sealed chambers as I have drawn and attached. The inner couple to facilitate attachment of coupler to cap made this really easy to accomplish. No highpass has been applied.
EDIT: There is not that much offset in level between drivers. This was not done with the same volume level on both units to show at higher levels on the second driver.
Directions for cup assembly...
Place Utouch in cap, and insert adapter tightly. This will compress the damping around the edge and hold it in place really well. Glue on coupler to the shoulder left by the previous 2 parts. Glue second piece of Utouch to the outer lip of the adapter with weight applied through opening to make sure it seals.
Apply thin adhesive backed 3m Velcro pieces to inside remaining open coupler wall area, and apply a thin layer of wool batting or your choice.
These are taken on axis in the baffle of my upcoming 'Bottleships' design, with the MAPD multichamber aperiodic sealed chambers as I have drawn and attached. The inner couple to facilitate attachment of coupler to cap made this really easy to accomplish. No highpass has been applied.
EDIT: There is not that much offset in level between drivers. This was not done with the same volume level on both units to show at higher levels on the second driver.
Directions for cup assembly...
Place Utouch in cap, and insert adapter tightly. This will compress the damping around the edge and hold it in place really well. Glue on coupler to the shoulder left by the previous 2 parts. Glue second piece of Utouch to the outer lip of the adapter with weight applied through opening to make sure it seals.
Apply thin adhesive backed 3m Velcro pieces to inside remaining open coupler wall area, and apply a thin layer of wool batting or your choice.
