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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 14th August 2019, 08:15 AM   #2031
silverprout is offline silverprout  France
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Quote:
Originally Posted by Ro808 View Post
Probably to narrow the beam (further) to increase output and reduce phase and other interference issues.
This horn was designed in order to cover the vocal range in stacked setups with BMS 4590 or 4592 coaxial.
Thanks for the information, IMHO high directivity horns are low-fi devices but unavoidable when a high directivity is required on a large frequency range.
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Old 14th August 2019, 12:23 PM   #2032
Ro808 is offline Ro808  Netherlands
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Originally Posted by 4real View Post
One related question to the experts: how is the function of the diffraction slot influenced by making the horn longer with the adapter?
This is a very good question.
AFAIK the inner workings of diffraction slots are very hard to desribe mathematically. IOW it's difficult to 'predict' the wavefront inside and after the slot at one particular frequency, let alone across the band.
Read Kolbreks thesis on 'mode matching' to find out. He couldn't really get passed the 'pinched throat' case, which is just one feature of some slotted horns. Modern diffraction slots are developed by use of computational techniques (FEA etc.).

I am looking forward to Dr. Geddes' reply, even though I am perfectly aware he 'doesn't like diffraction slots', to put it mildly.

Diffraction slots have their merits and they can work very well, if implemented with care. Earlier in this thread some examples were cited.

Here's another:
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Last edited by Ro808; 14th August 2019 at 12:51 PM.
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Old 14th August 2019, 01:56 PM   #2033
Ro808 is offline Ro808  Netherlands
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Obviously: "Bjørn Kolbrek couldn't get past the pinched throat case"

I also referred to the wrong thesis: "Extensions to the Mode Matching Method for Horn Loudspeaker Simulation".
The pinched throat is dealt with in his Master's thesis: "Modal sound propagation in curved horns of rectangular cross-section".

Last edited by Ro808; 14th August 2019 at 02:22 PM.
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Old 14th August 2019, 02:10 PM   #2034
plasnu is offline plasnu  United States
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Dr. Keele's study is a good reference for MTM crossover design. Can’t find Part 2...

https://www.xlrtechs.com/dbkeele.com...20Part%201.pdf
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Old 14th August 2019, 02:13 PM   #2035
tuyen is online now tuyen  Australia
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https://oceanwayaudio.com/display/wp...et_0119_LR.pdf

I’m assuming a good sounding implementation of ‘2-way’ MTM design with 2 15” woofers and a 1” HF Cd (assuming TAD200x) paired with a 100x40’ horn.
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Old 14th August 2019, 02:15 PM   #2036
plasnu is offline plasnu  United States
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Originally Posted by tuyen View Post
https://oceanwayaudio.com/display/wp...et_0119_LR.pdf

I’m assuming a good sounding implementation of ‘2-way’ MTM design with 2 15” woofers and a 1” HF Cd (assuming TAD200x) paired with a 100x40’ horn.
Hey, This is a copy of JBL S9500, which is a copy of Kinoshita.
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Old 14th August 2019, 02:18 PM   #2037
plasnu is offline plasnu  United States
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Originally Posted by tuyen View Post
https://oceanwayaudio.com/display/wp...et_0119_LR.pdf

I’m assuming a good sounding implementation of ‘2-way’ MTM design with 2 15” woofers and a 1” HF Cd (assuming TAD200x) paired with a 100x40’ horn.
Seriously, this kind of large WTW is somewhat problematic in a room where the ceiling is untreated and/or low.
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Old 14th August 2019, 02:23 PM   #2038
Ro808 is offline Ro808  Netherlands
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Quote:
Originally Posted by plasnu View Post
Dr. Keele's study is a good reference for MTM crossover design. Can’t find Part 2...

https://www.xlrtechs.com/dbkeele.com...20Part%201.pdf
This is the presentation of the paper.

This is the actual paper.

Last edited by Ro808; 14th August 2019 at 02:27 PM.
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Old 14th August 2019, 02:34 PM   #2039
plasnu is offline plasnu  United States
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Originally Posted by Ro808 View Post
This is the presentation of the paper.

This is the actual paper.
Great!

BTW, I was applying linear phase for WTW for years, but now, 18dB minimal phase. Different sounding approach, and I can't say which is better...
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Old 14th August 2019, 02:47 PM   #2040
tuyen is online now tuyen  Australia
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Not sure if posted yet, but this info about the JBL K2 project has same objectives as topic.

Some interesting info I found. 650hz crossover. 2nd order. Check the manuals of the various models

AllegroSound * JBL Project K2 S9500 *
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