These PMC wave-guides can be seen as employing two very different expansions that are interlaced. I have been thinking that the most dramatic effects of a wave-guide occur close to the dome. Not all the effects, by any means, but the pressure loading on the dome is going to be more intense close in. My experience with this is limited, and not documented, so if there are others with more scientific (or practical) background in this, I would find it enlightening.
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No, they are not. I had to go through a vendor and order them as replacements. They asked for the serial number but I kind of ignored that and they sold them to me anyways. Apparently these were the last pair they have. They always come in a matched set. They won't let you buy just one. The speaker designer told me to go this route and see what would happen. It worked out. So really, I just got lucky.
Sorry for not keeping up. Been very sick and not recovering. I have very little energy from blood loss. This may be my new normal until it progresses further.
I measure the impedence. I have been prepping for a big fishing trip for the last week so I didn't have time after work to take FR measurements. I only took this to try out the new DATS V3. Dats is ******* awesome. 30 seconds you have ZMA and TS parameters.
So are the wavecor domes available for sale? The speaker designer told me it took him quite a while to figure out the waveguide configuration to get what he wanted out of them. I don't know that I would feel right about reverse engineering his work and sharing it with the world considering he did help me source these drivers.
Oh no, I'm not pushing for duplicating the WG. I respect that more than anyone as I had a patent ripped off several years back. The dome is a 2" type, so its not that big compared to the 3" SS or Bliesma. I just wanted to identify the manufacturer of the dome itself. WGs can be engineered and figured out. I want to use a 3" dome in a large WG.
I want to integrate two of the M74A with a T34B in MTM and TMM into the enclosure baffle. I wish I had a CNC option for this. The transition to a large cone driver would be so easy and the offset depth would integrate nicely for time alignment.
I want to integrate two of the M74A with a T34B in MTM and TMM into the enclosure baffle. I wish I had a CNC option for this. The transition to a large cone driver would be so easy and the offset depth would integrate nicely for time alignment.
Once I get an idea of the sensitivity of these I'll have a better idea of how I want to use them. They will definitely go into something special. I'm brainstorming something vertically large. A 4 way with overlapping mids and multiple woofers. Might be a couple of years of design but it will be built around these. Wwmtmww if I can get my hands on another pair
I always measure a frequency sweep at different levels, not only one. Cause this shows how the driver behaves and what the lowest frequency of use is (usually when H3 starts rising fast with higher level).
Similar to this measurement, but this is a complete speaker:
I will do this but I was more alluding to an actual standard output of the amplifier to gauge the sensitivity of the driver itself.
I emailed them and they confirmed they do not sell these as matched pairs as bmsluite got with the other vendor. Still might be a nice value
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The price is eyewatering, but for making a WG to fit the driver these have a excellent starting point, 75mm soft dome.
Meant as substitution for the lack of ATC supply, used from 380hz ->.
From the same page as before:
https://www.avitech.at/en/startseite/995-pmc-ersatz-mitteltoener.html
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