Do you think this would work better in this case?From my own experience, an MTM is where a wave guided tweeter will come into practical use. The WG places the acoustic center further back, closer in line with the LF drivers and also allows for a lower xover, both which can improve the power response off axis and widen the main lobe. Even with increased CTC spacing from the WG, the two listed benefits can prevail. Increasing HF directivity down low to match the LF directivity around the xover point helps as well.
https://www.madisoundspeakerstore.c...bnwg-4-beryllium-dome-tweeter-with-waveguide/
C-C distancing (mid - tweeter anyway)will still be able to be within 1 wavelength.
Like in the Focal Grande Utopia speakers?Angling in both LF drivers vertically on the baffle can improve things too.
Interesting, do you have any examples by chance? I can’t seem to find any, by searching mini horn anyway.I suppose you could always front mount the woofers and rear mount the tweeter with a beveled or flared baffle (aka mini horn) and you could squeeze the tweeter in there better.
What is the reason for using dual drivers given this layout's attendant difficulties?However I haven’t come across the pros and cons to the driver placement for an mtm like in the drawing I attached.
I want the lowest possible distortion at high output volumes, which would be a lot to ask from a single midrange. I honestly just like having a lot of headroom.What is the reason for using dual drivers given this layout's attendant difficulties?
Yeah their efficiency isn’t the best, I was going to go with a single point source Dayton PS220-8 (96.5db efficient). But I’ve heard a lot of good things about the Satori Papyrus drivers (I heard a number of the engineers that designed Scanspeak Drivers also design drivers for SB Acoustics and that they perform very similarly for much less since they’re manufactured in Indonesia)Got it - I hadn't realised just how low-powered and low efficiency the mids were until I looked them up!
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Also I could only find RMS or long term power rating for wattage on the MW19p’s (70 watts), but not the short term power rating.
Apex Jr. specials by any chance?I have some 1" tweeters that are approximately 29mm in diameter
No, it was a top of the head kinda thing that might help deal with a large tweeter faceplate. There are a number of persons who have rear mounted a dome tweeter and made the baffle into a mini waveguide / horn but if they are diy, I wouldn't necessarily remember the name of the project or who built it.Interesting, do you have any examples by chance?
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I resemble that remark in that me n' many other 'hornies' used compression drivers (Motorola piezos for inexpensive speakers) in lieu of tweeters.There are a number of persons who have rear mounted a dome tweeter and made the baffle into a mini waveguide / horn
Right, we used tilted forward only for creating the best overall polar response over the HT's desired coverage angles where the HF horn's pattern dominated; also the baffle design plays a (big) role in all this, so while a circular driver is ~uniform it still requires using the right size drivers and/or at least the right XO point/slope + TD, BSC to get the best overall performance, so assume the Focal's entire box is a part of the design vs most folks just focusing on the MTM area's total response and assume it's the main reason so many of the consumer MTMs I've auditioned had me moving away PDQ, to the point where some folks just considered me flat out rude, ignorant WRT audio system SQ.
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