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Multi-Way Conventional loudspeakers with crossovers

SBAcoustics SB17NBAC35-4 and SB17NBAC35-8 measurements!
SBAcoustics SB17NBAC35-4 and SB17NBAC35-8 measurements!
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Old 9th March 2019, 02:56 PM   #1
gornir is online now gornir  Sweden
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SBAcoustics SB17NBAC35-4 and SB17NBAC35-8 measurements!
Default SBAcoustics SB17NBAC35-4 and SB17NBAC35-8 measurements!

Hi,

I know that many people are interested in the very nice SB17NBAC35 mid-woofer driver and I have published some measurements here:

SB17NBAC35-4 Measurements
SB17NBAC35-8 Measurements

I've also published a comparison between the SB17NBAC35-4 (black) and SB17NAC35-4 (silver) versions here:

SB17NBAC35-4 vs SB17NAC35-4 Measurements

Very nice mid-woofers with high price/performance ratio!

SBAcoustics SB17NBAC35-4 and SB17NBAC35-8 measurements!-sb17nbac35-4-vs-sb17nac35-4_2-jpg

Cheers,

/Göran
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File Type: jpg SB17NBAC35-4 vs SB17NAC35-4_2.JPG (92.3 KB, 435 views)
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Old 9th March 2019, 05:50 PM   #2
celef is offline celef
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Thanks for the measurements!
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Old 9th March 2019, 06:08 PM   #3
Mayuri is offline Mayuri  Finland
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Excellent drivers. Thank you for the effort!
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Old 9th March 2019, 06:26 PM   #4
dtaylo3 is offline dtaylo3  United States
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I'd like to see you measure the ceramic cones against the aluminum. Also very similar I think. Are you working on any new designs? Great web page!
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Old 10th March 2019, 01:13 AM   #5
LineSource is offline LineSource  United States
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Gornir,
Thanks to support from experts like you we continue to have an active and improving diy-Community.
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Old 10th March 2019, 11:57 AM   #6
HiFiCompass is offline HiFiCompass  Ukraine
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Thanks for the good review and your efforts!
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Old 13th March 2019, 06:18 AM   #7
Tropic is offline Tropic
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Default Low frequency response

I use two of these drivers with a SB26ADC crossed over 2nd order at 2000hz in a 51 litre ported enclosure and used in a home theatre system. These sound great in the mid range but I found the response in the female talking voice range to be very lumpy. Cersei's voice in Game of Thrones is particularly problematic - it seems to double in volume at certain frequencies. She's annoying enough as it is!

Has anyone else found this response and know how to fix it?
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File Type: jpg sb17nac.jpg (82.8 KB, 232 views)
File Type: jpg voice range.jpg (95.7 KB, 233 views)
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Old 13th March 2019, 06:31 AM   #8
picowallspeaker is offline picowallspeaker  Italy
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Probably the suspension surround does the trick of producing artifacts in that range. The "enlarged image" of the voice could be addressed to the cone itself - the design is more towards a good subwoofer rather than a mid-range as the suspension profile suggests.
It asks for a midrange; I don't see many...
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Old 13th March 2019, 07:41 AM   #9
celef is offline celef
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Quote:
Originally Posted by Tropic View Post
I use two of these drivers with a SB26ADC crossed over 2nd order at 2000hz in a 51 litre ported enclosure and used in a home theatre system. These sound great in the mid range but I found the response in the female talking voice range to be very lumpy. Cersei's voice in Game of Thrones is particularly problematic - it seems to double in volume at certain frequencies. She's annoying enough as it is!

Has anyone else found this response and know how to fix it?
i do not understand those graphs, please can you tell more?
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Old 14th March 2019, 03:32 AM   #10
Tropic is offline Tropic
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Quote:
Originally Posted by celef View Post
i do not understand those graphs, please can you tell more?

The frequency response on the left is the SB17NAC35-4 response measured at 1m with Room EQ Wizard (REW) using the USB microphone that came with my Anthem MRX 1120 amp. I graphed it in Excel so there is no smoothing and with a frequency step of 0.4 Hz it is very jagged.



The graph on the right is something I looked up to see the frequency of the human voice since that is the frequency where I have problems with my speaker. The loudest portion of the female voice (in red) is 160-280 hz and you can see the response jump around a lot in that range.


I use a sub-woofer in my system crossed over at 80 hz. Is anyone else using it down to that range or are people exclusively using this in 3-way designs?
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