Peavey has sold tens of thousands of compression drivers with a three octave range - currently SP2(2004) 1800 to 3600 to 7200 to 14400 hz. Previously the same RX22 driver was used at (1985 SP2) restricted power to 800 hz or a fourth octave. This is +- 3 db range, with .03% HD specified at 5 watts in the 2004 model. The 90 deg horizontal rolloff with 2004 horn is specified at =6 db.
Previously the 30 watt industry standard Altec Lansing 804d was specified at "500 to 22000 hz with the altec 500a 500b sectoral horn and N-500d dividing network". Quoting Altec cat-no AL-1477. That is even more range. Altec did not provide frequency response charts. But I have heard VOT personally and found them pleasing on movies in 1965 when my hearing extended to 20000 hz or beyond. There was lots of jangly percussion in Lord Jim the most demanding soundtrack I heard that year.
I intend to run the N314T-8 from 1200 hz to rolloff at 17000 hz which is actually above what I can now hear at 14000 hz. Very nearly 4 octaves. The 10 db less response at 20000 hz is of no use to me post Army service.
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I think the compression driver is fine, but it’s the wrong horn for the driver and intended bandwidth. Something with wide dispersion up top like a “butt-cheeks” profile for the driver should work better, like the shape of the Beyma CP25’s waveguide.
If you can’t source something like that then look to wide dispersion Planars. If you don’t mind a high cross-over point (>7 kHz) then this one might be what you are looking for:
https://www.parts-express.com/Beston-RT002A-Ribbon-Tweeter-277-112?quantity=1
If you can’t source something like that then look to wide dispersion Planars. If you don’t mind a high cross-over point (>7 kHz) then this one might be what you are looking for:
https://www.parts-express.com/Beston-RT002A-Ribbon-Tweeter-277-112?quantity=1
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Yes, at least the manufacturer is not hiding this "feature". It's actually not too bad for a $100 driver designed for low to mid range PA; for critical listening (Hifi), look elsewhere.
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I don’t think there’s much relevance with the home audio user for the 120db 10w tests folks…….not unless you’re planning on giving up this passion in a few months. Even clean distortion free components at 110db dynamic peaks is exhausting after 20 minutes or so.
I‘ve worked with that BMS driver crossed to a JBL 12” at 1khz…….it was a pleasure to listen to at normal to loudish levels. Those THD #s should only concern commercial high output end users which would likely cross this much higher.
I‘ve worked with that BMS driver crossed to a JBL 12” at 1khz…….it was a pleasure to listen to at normal to loudish levels. Those THD #s should only concern commercial high output end users which would likely cross this much higher.
And rightfully put sir……there’s simply no real musical content above 13k…..even 12k for anything but virtuoso violinist performing solos of the most demanding yet obscure pieces. It’s all just ambiance at that point which suggests a larger, more open space. A typical drywall home ceiling at 8ft will absorb all of it….this is how we know we’re in doors. Those big Altecs and the like beamed that content at high SPL avoiding being sucked up by the room.
I haven‘t concerned myself with response measurements above 15k for my entire time in this hobby and I cringe when folks obsess over it. And contrary to the above statement, might be the reason i’m such a fan of true ribbon tweeters which give you nice even power response where it counts, on the horizontal axis out to 90 degrees up to 12k…..after that who cares?…..it’s not coming back as an early reflection in a 3D space anyways. And I don’t know about the listening habits of everyone but when I want to enjoy a piece of music and be critical of the details, I sit my a$$ down +/- 10 of the vertical……and if I happen to be dancing around playing air guitar?….well…..I’m not really hyper focused on high frequency clarity.
There's a guy on hifisentralen, who lives around 2 hours driver south of Oslo. He has the T34B in a waveguide for his huge system. Play's insanely loud and clean. Maybe some of the best clean and detailed tweeter I've ever heard in a system like that.
https://www.hifisentralen.no/forumet/threads/bliesmas-venner.105301/#post-3634792
Scroll down to where you see the waveguide next to two larger Bliesma domes - that is the system I heard. I would argue, that the Bliesma definitely need a waveguide to shine - his did - IMO 👍
I've worked with the BMS too, great tweeter. Implementation could be the key here. Maybe move it away from the slanted wall and down closer to the bass - as Adason already mentioned.
Have now moved tweeters down to the Onken boxes. Attaches latest measurements with an up-adjusted 2dB target at 12kHz and out. I took several measurements before the delay was ok. Would like to learn how to make multi-point measurements in Audiolense. Has anyone come across this and can assist? It may seem that the BMS 4538 gives a little more now.
In post 1 we see how close the box is to room boundaries.
This can blur and colour the sound due to early reflections.
You can try some things
Put a sheet of egg crate damping just above the middle tone horn on the ceiling. Or any other damping you have at hand.
Eq by not putting up in the highs but by lowering eq down on frequencies in question and put overall tweeter loudness up to compensate. But measure in the near field, not in the far field!
Try an indirect reflecting tweeter backwards - this can help too and you do not need to adjust this one as it only makes ambience highs
This can blur and colour the sound due to early reflections.
You can try some things
Put a sheet of egg crate damping just above the middle tone horn on the ceiling. Or any other damping you have at hand.
Eq by not putting up in the highs but by lowering eq down on frequencies in question and put overall tweeter loudness up to compensate. But measure in the near field, not in the far field!
Try an indirect reflecting tweeter backwards - this can help too and you do not need to adjust this one as it only makes ambience highs
If you have a reflecting floor with tiles put a carpet on the floor before the boxes.
Can make a dramatic difference in tonality
Can make a dramatic difference in tonality
Wow. I saw that you played with the dome midranges, but haven't followed up on it further. Maybe the coverage of the 4 x Morel midranges did not sum a well as a much smaller area and wider spread from the Bliesma domes. But I'm happy it is better, even though I thought it was already very good 👍
Thank you again for the opportunity to listen to your system. It was a great experience, and humbling in contrast to my own DIY 😀
How did you correct for the offset acoustic center of the mids to the WGed tweeter? I'm assuming some form of DSP?
I never said that 😉 Tweeters were very good, and that's the subject and you still use them, so that's great 😀
Yes, and no plans to replace with anything else
I have some of these: Motorola KSN1038a in some speakers, and always liked the sound of them. Maybe worth trying with a suitable L-pad.
Audiolens corrected for the listener's position and measured at a distance of 30 cm. Listens at about 12 degrees from the axis