New 3-way, 18 inch bass, Beyma TPL150 AMT Horn - diyAudio
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Old 3rd November 2015, 10:05 AM   #1
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Default New 3-way, 18 inch bass, Beyma TPL150 AMT Horn

OK, here we go for a big one.

This project has been in the development/planning stage for 3 months. Originally, I was looking at using Altec/GPA 604 co-ax drivers with additional bass drivers. Since the early thoughts, we’ve merged into Air Motion Transformers (Beyma TP150 and matching horn), matched to the excellent Beyma 12P80 12-inch mid, and finished off with Faital Pro HP1030 18-inch woofers.

Ques taken from the $100,000 Daniel Hertz (Mark Levinson) M1.

http://www.danielhertz.com/index.php/products-2/m1

Cabinets will be:

Bass – 560mm x 560mm x 500mm deep, sealed. Birch ply construction with uber bracing. I'm yet to finalise the shape of the bass unit, with one drawing showing the angled sides with matching CNC'd ply curved add ons.

Mid bass – lovely curved CNC’d layers of Birch Ply....similar to Magico S2. The attached pic shows the to-scale drawing showing a 12-inch driver...this was helpful to test measurements.

Tweeter – simple L shape stand to start with to get the location/alignment sorted.

Xover will be 2nd order passive for the mid bass (100dB) and tweeter (102dB), suggested points of 200Hz and 1,500Hz (to be determined based on in-room testing). Huge tolerances in range chosen.

Bass will be handled by 2 x 800 watt MiniDSP PWR-DSP2 plate amp and integrated EQ. Faital Pro driver is 98dB, 1200 watt, 12.5mm Xmax. I don’t think bass output will be a challenge.

Am I excited by what’s possible with this system…? Very.

Links:

http://www.beyma.com/getpdf.php?pid=TPL-150/H

http://www.beyma.com/getpdf.php?pid=12P80Fe

FaitalPRO | LF Loudspeakers | 18HP1030

https://www.minidsp.com/products/pla...fiers/pwr-dsp2
Attached Images
File Type: jpg 3 way two cabinet.jpg (87.0 KB, 2509 views)
File Type: jpg bass concept.jpg (60.3 KB, 2445 views)
File Type: jpg mid bass driver drawing 2.jpg (77.2 KB, 2420 views)
File Type: jpg mid bass driver drawing.jpg (79.4 KB, 2400 views)
File Type: jpg sketch 2.jpg (62.5 KB, 2381 views)

Last edited by atilsley; 3rd November 2015 at 10:10 AM.
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Old 3rd November 2015, 10:08 AM   #2
Face is offline Face  United States
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I did not like 2nd order on that tweeter below 2k.

If crossing that low, I would recommend a steeper filter for less strained sound and a better directivity match.
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Old 3rd November 2015, 10:15 AM   #3
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Mid bass CNC'd cabinets I like....
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File Type: jpg minilr600_375.jpg (40.9 KB, 548 views)
File Type: jpg stack3.jpg (221.7 KB, 437 views)
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Old 3rd November 2015, 10:38 AM   #4
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Old 3rd November 2015, 12:33 PM   #5
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Why the 18HP1030 ? Have you considered the 18FH500, much lighter cone, extension not a problem if using EQ should work well in a 100 ltr cabinet.
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Old 3rd November 2015, 09:20 PM   #6
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Quote:
Originally Posted by Face View Post
I did not like 2nd order on that tweeter below 2k.

If crossing that low, I would recommend a steeper filter for less strained sound and a better directivity match.
Thanks for the feedback. With approx 1500hz xover, does that not give me a good 500 range to play with (eg 1000-1500hz)?

We can move to 3rd order as necessary, or pump the xover point to around 1800.
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Old 3rd November 2015, 09:53 PM   #7
Scott L is offline Scott L  United States
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Default m1 dup ?

Are you essentially refining the M1 ?

Are you using the exact same drivers ?

I must say I applaud your efforts, on this most ambitious project !
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Old 3rd November 2015, 11:04 PM   #8
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Default 18 12 Overture...!

Hi Atilsley,

Nice design concept.....Plenty Sd, great 12 inch midbass and TPL tweeter from Beyma and 3 separate cabinets ....Nice!
Also try 8mm thick Sorbothane sheet in between your cabinets, it gives great stability (very sticky!) and almost total isolation from vibration.

I would suggest a good DSP crossover / Eq instead of passive crossovers....High power Pro drivers / big amps do not match well with passive crossovers, compared to an active amplification / DSP crossover.

But its a lot more money $2,000 to $4,000 depending on amps and DSP, so you can always look at that in the future....Make external boxes for your passive crossovers?

A much lower cost but very worthwhile upgrade would be to use a Precision Devices PD 1850 if you want use a single 18 inch bass driver....Twin PD 1550's per side are OMG goooooood!

The PD 1850 is almost double the price of the FP driver but simply in another world as far as performance goes.

Hope this helps and all the best
Derek.
Attached Files
File Type: pdf Precision Devices 18 inch PD1850.pdf (287.7 KB, 137 views)
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Old 3rd November 2015, 11:50 PM   #9
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Quote:
Originally Posted by vinylnvalves View Post
Why the 18HP1030? Have you considered the 18FH500...
... or the BMS 18N862? Alternatively, if you want to make something different from the M1, the RCF LF21N551?

RCF - LF21N551

In terms of commercial efforts around the same drivers, have you checked out Tweek Geek's BMF-1 mentioned in this post:

Best midrange to pair with Beyma TPL-150
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Old 4th November 2015, 12:09 AM   #10
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Originally Posted by vinylnvalves View Post
Why the 18HP1030 ? Have you considered the 18FH500, much lighter cone, extension not a problem if using EQ should work well in a 100 ltr cabinet.
Um, not sure. I have access to a new pair of 1030's from the FP importer here in Sydney. Also, I used them before in a Cessaro/clone project I did. See pics of the woodwork for it.
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