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Multi-Way Conventional loudspeakers with crossovers

Best midrange to pair with Beyma TPL-150
Best midrange to pair with Beyma TPL-150
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Old 21st May 2017, 06:02 AM   #561
LineSource is offline LineSource  United States
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Beyma...Beyma...Beyma
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dave123, Very nice build.

--Are you using passive crossovers, or active slopes generated in your 6-channel preamp? (Brunel preamp info is down)
--The pure resistance of the TLP-150H membrane allows a perfect LR4 slope around your 1600-1750Hz crossover points.
--Using three stereo power amps is a very good way to balance SPL between drivers, with either active front-end Xovers, or passive on-driver Xovers. With a single amplifier a pair of 18" woofers are required to match the 12P80ND SPL/watt efficiency, and provide 220Hz crossover with baffle-step compensation.

--Your ears will be pleased after reducing edge diffraction with 1.5" radius router bit.
----You can buy 2"-6" radius MDF corners. Many cabinet shops can cut 3" radius rounds.
--Mounting the TPL-150H very close to the 12P80Nd can provide some reduction in lobing.
--Constructing a tapered sealed volume (simple triangle top+bottom boards) with rear stuffing behind the 12P80Nd can reduce resonances over the very wide BW.
==========
Has anyone accurately measured the time delay difference between the 12P80Nd_v2 and TPL-150H? Physical drawings suggest close time match.
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File Type: jpg offset.jpg (96.1 KB, 281 views)
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Old 21st May 2017, 06:16 AM   #562
chrapladm is offline chrapladm  Australia
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Just out of curiosity what are a good pair of 18" Beyma or BC drivers to use in a 3way XO around 200hz?

I will be using some 10's but curious on what 18's do well other than JBL.
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Old 21st May 2017, 08:20 AM   #563
Celsius is offline Celsius  Spain
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Quote:
Originally Posted by dave123 View Post
this is a speaker I've built using TPL-150H
Quote:
Originally Posted by Eldam View Post

But voila, re listened the Ravel's Boléro today... hummm liten to the last minute in a good live reccording
I would like to ask if you can listen the piano transition from 5th octave to 6th octave, for me is audible the distortion increment front TPL150 to 12g40, Piano in 6th octave is delicious on TPL but 5th on 12g40 is not my cup of tea.
all 12 inch have in this transition the 3rd Harmonic too high over TPL
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Old 21st May 2017, 09:06 AM   #564
Eldam is offline Eldam  France
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Dave 123,

Cool speaker

Any measurement at listening position to show us?
How far are the speakers from oneanother and from the sweet spot please (chair or sofa)? I'm asking how is the spl transition at 3 meters or more between the 12" and the TPL150H around the XO...

cheers
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Old 21st May 2017, 12:38 PM   #565
LewinskiH01 is offline LewinskiH01  Argentina
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Quote:
Originally Posted by Celsius View Post
I would like to ask if you can listen the piano transition from 5th octave to 6th octave, for me is audible the distortion increment front TPL150 to 12g40, Piano in 6th octave is delicious on TPL but 5th on 12g40 is not my cup of tea.
all 12 inch have in this transition the 3rd Harmonic too high over TPL
Keep in mind the 12p80nd is a midrange driver while the 12g40 is a bass driver. I have dual 10g40 and like them, but for bass. Heavy for midrange.
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Old 21st May 2017, 01:02 PM   #566
pieter t is offline pieter t  Netherlands
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Beyma calls the 12p80nd a "low frequency transducer"....
With its moving mass of 67 grams and serious beaming at frequencies higher than 1300 Hz I am a bit puzzled that people seem to like them partnered with the TPL150H.
IMO this is not a dedicated midrange speaker.
8 inch is about the limit for a real midrange driver; I compared Audax HM210Z10 with B&C 8PE21, and despite the very low Qts of the latter it partners very well with hornless TPL150 (crossover 1900 Hz).
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Old 21st May 2017, 03:00 PM   #567
Eldam is offline Eldam  France
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But this B&C we already talked about has a roll off at around 600 Hz... one hand half octave is difficult for a XO !

Maybe do you use a horn ?
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Old 21st May 2017, 03:11 PM   #568
pieter t is offline pieter t  Netherlands
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I don't notice a 600 Hz roll off.
It is used from 300 Hz in a damped but open enclosure and covers almost 3 octaves up to the TPL150.
Faitalpro 15pr400 for bass.
B&C 8PE21 is well known for mid bass duty when horn loaded, but as a direct midrange radiator it is the best I have heard until now as a combo with TPL150.
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Old 21st May 2017, 03:11 PM   #569
LewinskiH01 is offline LewinskiH01  Argentina
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Quote:
Originally Posted by pieter t View Post
8 inch is about the limit for a real midrange driver; I compared Audax HM210Z10 with B&C 8PE21, and despite the very low Qts of the latter it partners very well with hornless TPL150 (crossover 1900 Hz).
While I don't have hands-on experience, I'very come to the same conclusion regarding 8" being as big as I'd want to go. Maybe 10" with a TD10M and its curvilinear profile.

Very good to know you were able to compare HM210Z10 and 8pe21 paired with TPL and preferred the 8PE21.
Do you feel the TPL or the 8pe21 was the limiting factor in setting the 1900Hz xo point? Active or passive xo? Slope?

Thanks for sharing this!
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Old 21st May 2017, 03:18 PM   #570
Eldam is offline Eldam  France
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Thanks Pieter,

So You put it in a U-frame and it's flat to 300 Hz... Do you think in home environment it could go as low as 200 Hz while staying flat (e.g. : no EQ) despite the front bafle difraction (bafle step) ? Do you use a LR4 ? LR2 maybe ?
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