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Old 11th September 2019, 05:13 PM   #2711
dipoluser is offline dipoluser  Germany
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Default Line array meets open baffle

Hallo,
Let me introduce Safineia evo, 4 way Open baffle project, with Rpi Streamer (allodigione signature / RPi3b+); Hypex Fusion amp FA253/252, open baffle speaker with damped u-frame sub, line array mids and ribbon tweeter.

Best regards

Michael
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Old 11th September 2019, 05:50 PM   #2712
Matty is offline Matty  Germany
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Quote:
Originally Posted by dipoluser View Post
Hallo,
Let me introduce Safineia evo, 4 way Open baffle project, with Rpi Streamer (allodigione signature / RPi3b+); Hypex Fusion amp FA253/252, open baffle speaker with damped u-frame sub, line array mids and ribbon tweeter.

Best regards

Michael
Hi Michael,

thanks for showing us.

Can you give us some more details?

I would be interested in
  • which drivers are used
  • xover frequencies and type

Thanks and regards
Matthias
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Old 11th September 2019, 08:26 PM   #2713
dipoluser is offline dipoluser  Germany
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Hallo Matthias,

The chassis which I used are based on best k*a / xo and lowest harmonic distorsion (based on Hobby-HiFi).

Sub: Visaton TIW 200 XS
Lower MID: SB Acoustics SB17NBAC
Upper MID (line array): SB Acoustics SB65
Tweeter: Aurum Cantus AST 2560

XO: 130Hz/1000Hz/4000Hz; LR4

Best regards

Michael
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Old 17th September 2019, 08:40 PM   #2714
Mattes is offline Mattes  Germany
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Hi Michael,


nice to see some more crazy people in our country...
Very nice built and thoughtful design! Guess it was also a lot of work! Do I see some plexiglass baffles there, or is the line array completely naked?


Best regards


Mattes
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Old 17th September 2019, 09:07 PM   #2715
Mattes is offline Mattes  Germany
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Hi Matty,

you deserve a little bit more information with regards to the Dipole 18:

- First measurements showed the driver beeing 4-5 dB down in sensitivity from simulations which had been consistently precise until then (old AJhorn which is able to simulate OB). Well, one door closes, another opens, and by coincidence that was nearly the 16 kHz level of the FERTIN driver. A second magnet gave me back app. 1,5 dB to reach that level, so I eliminated the mountain in between and was happy.

- While rearranging the system to actual state, I took the chance to measure the drivers many times with various weights and positions. The reason for the mismatch with manufacturer´s data was a larger moving mass. With the self-measured TSP, simulations were correct again. Sadly, I can post the TSP only in November when I´m back home, as I´m at work right now.

- I added, as above, a second magnet ring on the back. Qts changed from 0,8 to 0,6, and I preferred the latter, and liked the subjectively better precision I was hearing.

- The Dipole 18 needs a lot of efforts to not shake whatever it´s build into. For the free-swinging installation, I added a 22 kg counterweight near the center of gravity to the rear of the motor, of course from amagnetic stainless steel. I would think of this as a minimum, the driver now weighs 42 kg, plus app. 3 kg for the (decoupled) baffle.

- I liked the sound very much from the beginning, despite the TSP flaws. The Dipole 18 can play low, loud and clean. It needs, however, a lot of power for that. I´m driving it with a Devialet 400, which shuts down somewhere at 600 or 700 Watts into 3,5 Ohms (double 8 Ohm VC). I can´t think about any alternatives if one wants passive 86 dBs/2,8 V down into the 20s with a reasonably sized OB.

All the best

Mattes
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Old 18th September 2019, 03:34 AM   #2716
gadut is offline gadut  Indonesia
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"Gunungan" 4way dsp Open Baffle

DSP : Minidsp 2x4HD

Driver : Amplifier
21" ACR Fab 113212 : D4K5 1kW Class D
12" ACR Fab 75124 : D4K5 1kW Class D
5" PRV 5MR450 : PeeCeeBee v4 50W Class AB
Beston RT002-dipole : PeeCeeBee v4 50W Class AB

Next : crossover setup + measurement 👌 I will use Harsch xo as 1st try
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Old 18th September 2019, 07:29 AM   #2717
kazap is offline kazap
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Quote:
Originally Posted by Mattes View Post
Hi Matthias,

your questions will easily open up a longer discussion (not that I´m afraid of it...), and I think it´s better to split off same from here.

Anybody else interested?....

I for one think your superb build deserves a dedicated thread, where your design rationale is revealed.
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Old 18th September 2019, 09:41 AM   #2718
dipoluser is offline dipoluser  Germany
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Quote:
Originally Posted by Mattes View Post
Hi Michael,


nice to see some more crazy people in our country...
Very nice built and thoughtful design! Guess it was also a lot of work! Do I see some plexiglass baffles there, or is the line array completely naked?


Best regards


Mattes
Hi Mattes,

Yes, there is only an open baffle for the line array, do to best dipol 8. You will find more pictures on octaaudio – DIY Open Baffle Projects.

Best regards

Michael
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Old 18th September 2019, 12:15 PM   #2719
kec is online now kec  United States
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Quote:
Originally Posted by dipoluser View Post
Hi Mattes,

Yes, there is only an open baffle for the line array, do to best dipol 8. You will find more pictures on octaaudio – DIY Open Baffle Projects.

Best regards

Michael
Nice job Michael. Excellent design.
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Old 18th September 2019, 03:07 PM   #2720
Juhazi is offline Juhazi  Finland
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Location: Jyväskylä, Finland
Quote:
Originally Posted by gadut View Post
"Gunungan" 4way dsp Open Baffle

DSP : Minidsp 2x4HD

Driver : Amplifier
21" ACR Fab 113212 : D4K5 1kW Class D
12" ACR Fab 75124 : D4K5 1kW Class D
5" PRV 5MR450 : PeeCeeBee v4 50W Class AB
Beston RT002-dipole : PeeCeeBee v4 50W Class AB

Next : crossover setup + measurement 👌 I will use Harsch xo as 1st try
Now this looks good! Which dsp are yo using? Anyway now the fun begins with listening, measuring and experimenting!
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