3 way speaker with beyma drivers

[tpsorin]

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

[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

[kepa1]

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

[tpsorin]

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? )

[tinitus]

Well, every driver bumps up and down, what matters is in which manner it does it

[tpsorin]

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?

[w3eman]

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