15" Beyma SM-115N - diyAudio
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Old 2nd October 2007, 10:06 PM   #1
Giarsun is offline Giarsun  France
diyAudio Member
Join Date: Dec 2004
Location: Alps
Default 15" Beyma SM-115N

http://profesional.beyma.com/ENGLISH...php?pdf=SM-115 N.pdf

Was considering using this driver up to around 900 Hz for a Summa like speaker.

The only thing that bothers me is a problem around 350 Hz. One can see it on FR curve as a dip, on distorsion curve as a rise of H3 (?). It also seems to show on impedance curve as a very small bump (zoom PDF doc at least 300% to see it).

What do you think can be the origin of the problem ? Do you think it's a no go beyond 300 Hz ?

Thanks in advance
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Old 3rd October 2007, 12:41 AM   #2
diyAudio Member
Join Date: Jan 2004
Location: Toronto, ON, Canada
What's your budget?
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Old 3rd October 2007, 07:22 AM   #3
Giarsun is offline Giarsun  France
diyAudio Member
Join Date: Dec 2004
Location: Alps
Originally posted by 454Casull
What's your budget?
250 / 300 $ max per driver. It's not only a question of price of course.
Beyma's SM-115N has interesting T/S parameters :
low FS (for a pro driver) + not too low QTs + big VAS so I can design a ported box using an alignment lower than 5.7, reasonnably low Le, well behaved in upper frequencies, and high efficiency.
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