B&C 8PS21 or Beyma 8BR40 - diyAudio
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Old 28th January 2006, 03:34 PM   #1
ronning is offline ronning  Norway
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Question B&C 8PS21 or Beyma 8BR40

Iím considering both of these drivers as midrange in a 3-way project, and was wondering if anyone had any experience with either one of them.

B&C 8PS21

Beyma 8BR40

They will be crossed over at 150/2000hz with a ribbon on the top and the Eton 11-581 hitting the deep notes.

What Iím really looking for is a rock and roll midrange, something that can move air. And by reading other treads on the forum I have learned that pro-drivers are good at this.(?)

Please feel free to tell me about any other good driver, pro or not pro, that is over 7inches, can handle sealed enclosures, have good X-max and SPL over 90dB.

Thanks
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Old 28th January 2006, 07:32 PM   #2
ScottG is offline ScottG  United States
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active or not? If so (and with a high order slope), you might be OK.. remember you'll likely have baffle step compensation and limitations in low frew. response from the ribbon (depending on the type). All of which can be "worked-around" with an active setup.

Of the 2 - def. the B&C.. the studio Beyma is constructed more like a typical hi-fi driver.
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Old 29th January 2006, 03:04 AM   #3
ronning is offline ronning  Norway
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Active or not I havenít really decided. I was hoping it would be OK to use a passive crossover as I (at the moment) only have one 2-channel amp. The tweeter is likely to be a fountek neocd 2.0 or similar.
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Old 29th January 2006, 04:16 PM   #4
kepa1 is offline kepa1  France
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This 8" Beyma is from their low end range and is rather a bass-mid driver.

You'd be happier with the 8Mi100 or with a PRO170 from Audax, which I saw on madisound lately...

Edit : the 8M60 is a dedicated midrange driver too
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Old 29th January 2006, 08:11 PM   #5
Frankx is offline Frankx  Italy
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I have used a similar model: the beyma 8lw30 with very good results. In my opinion those woofer are better suited as a midwoofer than as midrange. They have the first breakup mode between 1800 and 3000 Hz. The lw30 sound is very good up to 1400-1600 Hz, looking at the distortion graph perhaps better than the 8 br 40 but if you need a true midrange a good 6/7" like the phl 1120, b&c 6 md 38, beyma 6 mi 100, audax pr17 is better.
If you don't need high sensibility (and dynamics) a good mate for the eton 11-581 is the accuton c79.
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Old 31st January 2006, 07:56 PM   #6
ronning is offline ronning  Norway
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First of all thanks for the replies

I guess what I really need is a mid-woofer/mid-bass to act as the midrange/ mid-driver. I remind you that it will be crossed quite low(150/2000hz) and wont need to be good in the upper midrange area. I like the idea of a rather large midrange, it seems right when it's playing down to 150hz and when the goal is to get a dynamic and engaging speaker that sounds great with rock and roll.

Quote:
a good mate for the eton 11-581 is the accuton c79.
Iím aware that accuton is perfect with eton, but the C79 does not look like a rock and roll driver. I would rather go with a larger woofer like the C95-T6 or the C≤90(if I could afford it). But accuton and rock music? Im not convinced.

I have considered the eton 7-372. It seems good except its only 88dB. The seas W21EX001 is very good and used with the eton 11-581 and a HI-VI ribbon in the Ascendo speakers, but it is out of production and expensive. Any other thoughts on these drivers?
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Old 31st January 2006, 08:44 PM   #7
thalis is offline thalis  Greece
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ScottG is right. Your crossover will be a difficult task in any case, for its both points.
Iíve worked with a somewhat older beyma (8B-40), it was Ďokí.
These are different drivers, the beyma is a bass-mid of ca 89dB/2,83 which also needs some volume (you shouldnít enclose it in 5 or 10 litter volume even if you cross it at 200Hz), the B&C is mostly a mid driver (but can be easily crossed in the region you specified) of much higher sensitivity and is a better overall driver but you will struggle more to get rid of its cone-breakup (in the crossover region exactly, somewhat big). The beyma looks crossover-friendlier and easier to end up with a good speaker, the B&C would be a more dangerous bet, but I would go with it, if I hadnít some PHL1220 in my closet ;-)
Regards,
Thalis
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Old 1st February 2006, 01:11 AM   #8
Frankx is offline Frankx  Italy
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Ok I understand.
In this case the beyma or b%c are a better choice but you can consider also a phl.
If I would build that kind of speaker (I did) I'll use an audax pr17z0 with a 12" or 15" woofer like a 15" eminence magnum pro/omega pro, 12" kappa pro, b&c 12/15" tbx100. This can give you a chest pounding bass plus a lively and "fast" midrange.
The ribbon tweeter in my opinion is too polite (have you heard the ascendo?) and also don't have such a nice measures: see http://www.zaphaudio.com/nondomes/
better suited is the scan speak D2904/710000 (expensive) the morel supreme, the focal 120 (a bit harsh??) or the low priced vifa H26TG35 used (with the audax pr 17z0) in the well known Von Schweikert db99 (not the best tweeter overall).
For your need I think is better to use a big pro woofer crossovered a bit higher (around 250-400 Hz) to gain more power and punch instead to have a midwoofer crossovered lower with a subwoofer driver (like the peerless xls). In this case you obtain a cleaner midbass (no crossover in this region) but compared to the other option an uninvolving sound. If the crossover is well built you can't imagine how good can be the sound of this loudspeaker.
Franco
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Old 1st February 2006, 11:02 AM   #9
thalis is offline thalis  Greece
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A good measurement system can prove to be a invaluable work tool, but also a weapon of destruction. The same applies with almost every tool.
Ribbons do measure well, mostly better than domes. Even in these tests there, someone who can read values and understand what they mean would be pleased by what he sees (counting in a real-world usage of every unit, and the way these tests were performed).
Still, there is a problem. No one has proof that these specific tests alone and in the way they were performed correlate really well with the overall driver quality. If they correlate well, I have great news:
I discovered the Hi-Vi K1 tweeter, which costs 9 dollars. According to the figures presented there, it is (almost) second to none! Magnificent CSD, magnificent freq. response, very good distortion spectra. According to these tests, there is no reason for a Raven or a 100 and 200$ dome Ė at the most you will pay 2000% more for just a 1-2% improvement (and if).
Regards,
Thalis
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Old 1st February 2006, 02:42 PM   #10
ronning is offline ronning  Norway
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Once again thanks for the input.

First of all I have to say that I already bought the eton 11-581, got it at well under half price and couldnít resist buying it.

So my main is object is finding a good midrange and tweeter to go with it, something that rocks but still matches the eton. I just thought the easiest way around this problem was to go with a big midrange and crossing it low. I have considered the use of two (or more) midranges, but have no real candidates in this category. Any thoughts?

No I have not heard the Ascendo only read reviews.
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