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Multi-Way Conventional loudspeakers with crossovers

JBL PT 100x100 waveguides, any experience? MPro?
JBL PT 100x100 waveguides, any experience? MPro?
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Old 17th November 2018, 12:29 AM   #11
AllenB is online now AllenB  Australia
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I was assuming your first question wasn't specific to this speaker. Now I'm not sure what your question is.
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Old 17th November 2018, 01:24 AM   #12
norman bates is offline norman bates  United States
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yup, I'm just opening a dialog and feeling what people think about the horns.

And, yes, past 8khz, I'm not sure either what is going on either.
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Old 17th November 2018, 09:52 PM   #13
DualTriode is offline DualTriode  United States
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Hello,

I am going to muse a bit more about using this JBL PT H1010HF waveguide.

The good folks over at JBL have done a lot listening preference tests. Not just can you hear a difference but do you prefer A over B or have no preference. I do not believe that there is any coincidence that the very similar waveguide in the JBL flagship M2 monitor is also 100 degree by 100 degree “constant dispersion”. I have the belief that the 100 x 100 dispersion waveguide is preferred because of the sense of space or emersion in the listening room(s) where the preference testing is performed.

The next logical step for successful marketing is to link this factory preference testing to the listening rooms across the market place. Good job Harmon/JBL.

Thanks DT
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Old 20th November 2018, 11:20 PM   #14
DualTriode is offline DualTriode  United States
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Hello,

A pair of H1010HF-1 waveguides will be delivered by UPS tomorrow. The JBL 2451 drivers are due on Friday. There will be a couple of days over the weekend to test drive these “Constant Dispersion” waveguides.

Looking around at “Constant Dispersion” waveguide performance it looks like none of them do a consistent job across the Band Width up to 20Khz. Even the M2 has a steep dogleg up in the DI vs frequency plot starting at about 8Khz.

Does anyone recall seeing or using a DIY speaker turntable for off axis speaker frequency response testing?

Thanks DT
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Old 21st November 2018, 01:33 AM   #15
norman bates is offline norman bates  United States
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pity, I was looking at 2432h, especially for $200 new.
Sold my 2435, oh well, didn't know I was going in this direction.

I look forward to measurements.
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Old 7th December 2018, 06:10 PM   #16
norman bates is offline norman bates  United States
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I see there are the older pt waveguide in a jbl speaker.

The am4212/00.
I can speak for the compression driver, the 2407 doesn't have the big peak at 10khz that the 2408 does (jbl usually notches it out).
And no ferrofluid to worry about if 10 years old.

JBL AM4212/00 2-WAY LOUDSPEAKER (ONE) | eBay

If you offer 250, they will probably counter offer with 300 each (plus 85 shipping each).

The pic is the 4212/00, notice the bubble near throat.

I have no associations with seller and they are not mine.
I just ordered a pair of 6212/00 from them.


Norman
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Old 11th February 2019, 05:16 AM   #17
DualTriode is offline DualTriode  United States
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Hello Norman,

It is all your fault.

I have been using the JBL H1010 HF-1’s with JBL 2432 drivers for several weeks now. I like the way they sound; open dynamic and all that. I like the 100 X 100 beamwidth much better than the 90 X 50 kind of stuff. With the 100 X 100 there is much more freedom to get up out of your seat and move around, the sweat spot, if you will, is much bigger. No head in the vise kind of affect like you get with the narrow beamwidth waveguides.

I am using 10 inch JBL2123H cones for mid-range drivers and cross-over at 1600Hz to the JBL H1010 HF-1’s with JBL 2432’s.

Thanks DT
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Old 11th February 2019, 04:33 PM   #18
Robh3606 is offline Robh3606  United States
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Quote:
I like the 100 X 100 beamwidth much better than the 90 X 50 kind of stuff. With the 100 X 100 there is much more freedom to get up out of your seat and move around, the sweat spot, if you will, is much bigger. No head in the vise kind of affect like you get with the narrow beamwidth waveguides.

I am using 10 inch JBL2123H cones for mid-range drivers and cross-over at 1600Hz to the JBL H1010 HF-1’s with JBL 2432’s.
Hello DT

Yeah me too on the 100x100 started with 2344 and 2425's in my active set-up. Really liked the open sound and freedom to move around. They also imaged great, nice and stable no head in a vice like you were saying. Changed over to PTH1010h and 2435 years ago and have not changed them. I also use a 2123 crossed about 1,5K and really like that combo.

Yeah something about those 100X100 just sound really good in my room

Rob
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Old 11th February 2019, 06:01 PM   #19
norman bates is offline norman bates  United States
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I've been looking at the crossover on my jbl am6212/00.

The 2431 has a plane wave response drooping after a couple of khz till peak maybe 13khz.
Seeing how the horn is 100x100, i assume no free boost as freq goes up.
Yet jbl's crossover has a notch at 10khz.

Any thoughts ?

Also, i think the jbl 2206 climbs till its 1200hz cross over point.

I'm having a hard time eq'ing my speaker by ear.
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Old 11th February 2019, 07:41 PM   #20
Robh3606 is offline Robh3606  United States
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Quote:
I'm having a hard time eq'ing my speaker by ear.
Hello Norman

They don't sound right as is??

Rob
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