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Multi-Way Conventional loudspeakers with crossovers

Is it possible to cover the whole spectrum, high spl, low distortion with a 2-way?
Is it possible to cover the whole spectrum, high spl, low distortion with a 2-way?
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Old Yesterday, 08:38 AM   #2341
norman bates is offline norman bates  United States
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I would be in.

Spherical horn for a 1.5" jbl throat, maybe 5.5" deep.
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Old Today, 03:49 AM   #2342
mitchba is offline mitchba  Canada
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Quote:
Originally Posted by camplo View Post
Mitchba, I haven’t checked out your link just yet, not to ask anything redundant. Can you describe the top register of your expression with the 4” aquaplas diaphragm. How would you compare it toke wise to some of the other tweeter options (dome, ribbon).

I have high hopes, the aquaplas has been described to be close enough to the performance of beryllium not warrant the cost of such, while requiring less eq in the top register and being the most damped option as well.

Norman 23” jmlc, you can see an example on auto tech or search this thread for actual pictures
camplo, the response in the top octave is extended, but a bit ragged, which can be smoothed out with eq. I get to -3 dB at 20 kHz. Thankfully it is a low distortion device, so sounds detailed and smooth. You can hear the comparo to the Kef's in the link.

I am sure I linked this before, but member notnyt measured and compared a bunch of JBL CD's, including one with Be dia loaded: Just purchased a pair of JBL 4722n speakers. - Page 129 - AVS Forum | Home Theater Discussions And Reviews

I am happy with the response with the 2453H-SL. Now if I can only find a better waveguide
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Old Today, 06:22 AM   #2343
plasnu is offline plasnu  United States
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Quote:
Originally Posted by camplo View Post
Can you describe the top register of your expression with the 4” aquaplas diaphragm. How would you compare it toke wise to some of the other tweeter options (dome, ribbon).
Based on my experience with Kinoshita (Beryllium) and JBL (Aquaplas), I would say the strength of the 4” Aquaplas is not the top octave.

Aquaplas diaphragm has a distinctive tight sound due to its damped metal structure, and its top is less bright and less airly than the other metal diaphragm drivers, including uncoated titanium and Beryllium. The good thing about it is, it has less metal signature, slightly a bit more paper like, so the transition to the paper cone woofer is more natural than the other metal diaphragms to my ears. I feel that TAD Beryllium is cleaner and airlier, and has almost no signature by itself, but it's midrange is less meaty than Aquaplas. I think some would say Beryllium horn driver has the same signature as Beryllium / Diamond dome tweeters.

Ribbon is also clean ands airly. I have seen many people add ribbon super tweeter to Aquaplas, and I think its pretty reasonable. Softdome is always great, nothing wrong, a little boring nice guy.

Last edited by plasnu; Today at 06:27 AM.
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Old Today, 10:31 AM   #2344
Ro808 is offline Ro808  Netherlands
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Plasnu, that's a nice description.
Never did a direct comparison, but yours makes perfect sense.

Jzagaja experimented with Aquaplas on cheap 3" Titanium diaphragms in the past .

Sometimes, the 'body' and paper like signature of Aquaplas may even be preferable to the transparancy of Beryllium.
For example if you listen to less then stellar recordings at higher SPLs.

Last edited by Ro808; Today at 10:52 AM.
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Old Today, 11:32 AM   #2345
Ro808 is offline Ro808  Netherlands
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In 2011 Al Klappenberger (ALK engineering) tested some drivers to be used with the Eliptrac 400 horn, including the FaitalPRO HF200.

I suspect his findings have contributed to the popularity of Faital drivers in the US.

"The mic was setup 2 feet from the mouth, level up to 105 dB SPL with a 400 Hz tone. The analyzer computed the harmonic distortion at -38dB. That's only 1.26% harmonic distortion!
Next I reduced the level need to make 105 dB at 2 feet by 10 dB and lowered the tone to 200 Hz. That is roughly what the level would be through a 12 dB / octave filter with the woofer generating the tone at 105 dB. The level out of the driver dropped to 63 dB SPL with the second harmonic down about 15 dB lower. That's 17.8 % distortion but the level is so low it would not be noticed!"

Quite impressive I would think.
Attached Images
File Type: gif HF200_Distortion.gif (13.9 KB, 37 views)

Last edited by Ro808; Today at 11:34 AM.
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