3 way speaker with beyma drivers - diyAudio
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Old 9th September 2006, 08:00 AM   #1
tpsorin is offline tpsorin  Romania
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Join Date: Jun 2005
Location: Timisoara
Default 3 way speaker with beyma drivers

Hello,

I want to make a 3way loudspeaker. System will be used in 4.7mx3.7mx2.5m room especially for classical music.

1.
In my town, I can listen/ buy Beyma Studio drivers.

I don't know what to choose between:
8BR40 + 5MP60N + T2010 250Hz/2500Hz 1st order acoustic crossover. Time aligned

or
8BR40 + MC115 + T2010 800Hz? / 5000Hz 2nd order crossover?

I don't need a lot of power, so I prefer to cross as low as possible, to have a good off-axis response.

2.I can also order (but without listening) Visaton, Scan-Speak drivers.
Are this one worth the price difference over Beyma drivers?

Any other suggestions are welcome.

Thanks,
Sorin
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Old 9th September 2006, 11:08 AM   #2
tinitus is offline tinitus  Europe
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Hi, with MC115 it looks like you wont need any tweeter at all, or maybe only a supertweeter above 10khz, maybe even placed on the back - but it might not be wise to cross MC115 at 800hz with only 6db - Fs is very similar to a normal quality tweeter, but it is bigger and handles low frequencies better - but 6db/12db is not that hard
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Old 9th September 2006, 12:00 PM   #3
kepa1 is offline kepa1  France
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Join Date: Apr 2004
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This maybe a little oversized but at least it's been designed buy a speaker shop in France so you don't have to worry about crossover issues :




Dimensions h x l x p ( cm ) 90 x 36 x 40
HP Grave Beyma 12B100R
HP Médium Beyma 6MI90
HP Aigu Beyma T2030
Pente d'atténuation filtre 12
Fréquence de coupure (Hz) 380/5000
Efficacité (db) 94
Bande passante ( +/- 3db ) 37 - 20000
Principe de charge BR
Puissance RMS 150
Attached Images
File Type: jpg studiolab300.jpg (42.8 KB, 592 views)
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Old 9th September 2006, 05:04 PM   #4
tpsorin is offline tpsorin  Romania
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Join Date: Jun 2005
Location: Timisoara
Quote:
Originally posted by tinitus
Hi, with MC115 it looks like you wont need any tweeter at all, or maybe only a supertweeter above 10khz, maybe even placed on the back - but it might not be wise to cross MC115 at 800hz with only 6db - Fs is very similar to a normal quality tweeter, but it is bigger and handles low frequencies better - but 6db/12db is not that hard
6dB is for first variant (with 5MP60N); if I will use MC115 then I will have 12 or 24dB crossover.

I'm not sure that MC115 does not need a tweeter. It is 5-6dB down allready at 5kHz

kepa1: 12" is too big for my room. And I don't want not to worry about crossover. Where is the fun of diy? )
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Old 9th September 2006, 06:15 PM   #5
tinitus is offline tinitus  Europe
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Well, every driver bumps up and down, what matters is in which manner it does it
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Old 12th September 2006, 07:57 PM   #6
tpsorin is offline tpsorin  Romania
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Join Date: Jun 2005
Location: Timisoara
I have started designing the crossover using "Passive Crossover Designer" from FRD Consortium.

Two questions:

1.Why is Raw midrange phase displayed as falling from 1000Hz? (see picture)
I have entered ~ 0 for all frequecies in .frd file starting from 200Hz

2.Is there any way to reduce higher frequencies from woofer (not electrical)? Something like an acoustic filter?
Attached Images
File Type: jpg 5mp phase.jpg (58.5 KB, 372 views)
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Old 3rd December 2006, 12:02 AM   #7
w3eman is offline w3eman  Romania
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Default Beyma

Somebody can send me the plans of the speaker with the beyma drivers, i want to build it .
Thanx
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