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Multi-Way Conventional loudspeakers with crossovers

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Old 21st March 2012, 05:07 PM   #1
Joostp is offline Joostp  Netherlands
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Default 2 way monitor with Dynaudio T330D and Scan-speak 15wu8741

I just finished my birch plywood monitors using a Dynaudio T330D and a Scan-speak 15wu8741.
It is an active monitor with a Hypex PSC2.400D plate amp(2 x 400 watt digital amps with a DSP) in the back. I use the AES/EBU digital input on the Hypex to stream music from my NAS.

The design is made in MS-Visio and exported it to Autocad DXF files which were used directly to steer the CNC router table. All elements are routed from one sheet of 30mm birch plywood and then glued together.

I am very pleased with the sound but still in the process of measuring and adjusting the DSP. The sound stage is stable and the bass very satisfying for such a small closed cabinet.

Just a few pics:
Attached Images
File Type: jpg Elements.jpg (180.3 KB, 455 views)
File Type: jpg Cabinet1.jpg (203.8 KB, 442 views)
File Type: jpg Cabinet2.jpg (176.4 KB, 430 views)
File Type: jpg Cabinet3.jpg (167.9 KB, 435 views)

Last edited by Joostp; 22nd March 2012 at 06:41 PM. Reason: typo
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Old 21st March 2012, 05:26 PM   #2
weskoki is offline weskoki  Europe
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Excellent! No need for veneering this one.
Did you clear coat it?
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Old 21st March 2012, 06:08 PM   #3
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amazing, any idea of the total cost?
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Old 22nd March 2012, 07:35 AM   #4
Joostp is offline Joostp  Netherlands
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After several hours of sanding i applied 4 layers of clearcoat as the only finish.
I estimate the cost at 1.100 per monitor total.


T330D 350
15wu8741 300
Hypex 275
Cabinet 275
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Old 22nd March 2012, 08:25 AM   #5
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Superb !

What is the crossover frequency and slopes ?
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Old 22nd March 2012, 09:48 AM   #6
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Thanks for the reply, how are you feeding the Hypex, are you happy with it?

And you CNC'd out all the material from one thick sheet?

Really great work.
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Old 22nd March 2012, 11:48 AM   #7
Joostp is offline Joostp  Netherlands
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I attached the building plan in PDF. Net volume is appr. 16 liters

Crossover for Scan-speak is 6 db at 1250 Hz
Crossover for T330D is 12 db and about 1300Hz

In the DSP i have also made several adjustments to get a flat frequency response. I measure the response with REW and a behringer ECM8000 mic.

I will post some more info (DSP graph and freq. response) tonight.
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File Type: pdf 2 way active monitor.pdf (52.8 KB, 108 views)
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Old 22nd March 2012, 12:00 PM   #8
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Pay attention too to the response phase
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Old 22nd March 2012, 01:21 PM   #9
Joostp is offline Joostp  Netherlands
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Default SPL and Phase graph

The Hypex sounds powerful and detailed. It's the all digital version but i use the analogue inputs for my Sonos system and for serious listening and use a PC as source.Hypex switches automatically between inputs.

PC --> USB --> Audio GD digital interface --> spdif/Coax --> Neutric impedance transformer --> EAS/EBU interlink --> Hypex AES/EBU.

DSP settings are a work in progress and the sound needs a little warmth. There is a 85u second delay for phase correction.

I attached a SPL and Phase graph but i'm having trouble to interpret the phase graph. Maybe someone can help me there?
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File Type: jpg spl and phase prof 13.jpg (47.0 KB, 359 views)
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Old 22nd March 2012, 01:37 PM   #10
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To understand something to the phase graph, you should plot the "minimum phase".
85us, i supposed you found it when you connected, the driver out phase with the deepest hole.
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