Monacor SPH-250CTC - What to build? - diyAudio
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Old 29th January 2013, 02:54 PM   #1
oshifis is offline oshifis  Hungary
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Default Monacor SPH-250CTC - What to build?

I need your advice regarding this twin-coil loudspeaker. Can it be used as a central subwoofer serving both channels? How can I blend it with my electrostatic panels (if this is possible at all)? Actually I built a 6th order bandpass cabinet using it with a passive radiator, but the sound is horrible. It is booming so that you get headache. Probably due to the large group delay and bad transient response. Put it simply in a closed box?

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Old 30th January 2013, 04:02 AM   #2
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I will give a quick look.
Do you know it's EBP?
Monacor SPH-250CTC it's good in BR box about 55L and tunned to FB = 25 Hz.
F3 (in room) ~30Hz.
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Old 30th January 2013, 04:28 AM   #3
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I've read that it needs a very long break-up time
So about 7-10 days of normal running (3 hours a day)
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Old 30th January 2013, 06:15 PM   #4
bjorno is offline bjorno  Sweden
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Hi FYI:

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Old 30th January 2013, 07:03 PM   #5
oshifis is offline oshifis  Hungary
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bjorno, thank you for taking time for the simulations. I think a closed box is out of question. A traditional vented box doesn't look bad indeed. I am not very keen on horns, labyrinths, transmission lines and the like - never tried one though. How would it perform in a H-frame dipole? Or is the Qts too low for that? I might consider also an active system, there I would have more freedom.
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Old 30th January 2013, 07:23 PM   #6
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by oshifis View Post
bjorno, thank you for taking time for the simulations. I think a closed box is out of question. A traditional vented box doesn't look bad indeed. I am not very keen on horns, labyrinths, transmission lines and the like - never tried one though. How would it perform in a H-frame dipole? Or is the Qts too low for that? I might consider also an active system, there I would have more freedom.
IMO this driver is not well suited in a H frame due to the very low x-max and the low Qts but of course you can try it out:
Prepare to end up with a experienced BW much lower than a simulation would show after the need of EQ-ing, resulting in very low SPL at the lower frequencies that would barely be heard even in a bedroom environment.

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