New SB Acoustics wideband

JohnR · « **on:** 24 Jun 2019, 05:12 am »

Noticed this on the madisound new arrivals:

https://www.madisoundspeakerstore.com/approx-3-fullrange/sb-acoustics-sb10pgc21-4-3-full-range/

http://www.sbacoustics.com/index.php/products/wideband/3-sb10pgc21-4/

charmerci · « **Reply #1 on:** 24 Jun 2019, 02:31 pm »

Wow. What's with the high frequency rise?

JohnR · « **Reply #2 on:** 24 Jun 2019, 02:46 pm »

I guess you would probably want to be listening about 15 degrees off axis.

FullRangeMan · « **Reply #3 on:** 24 Jun 2019, 02:52 pm »

First time I see a fiberglass cone, the 3 suggested enclosures are sealed.
The freq start to rise away from the musical range, the piano higher note are 4186Hz, a well made internal stuff will lower it.

richidoo · « **Reply #4 on:** 24 Jun 2019, 03:28 pm »

Quote from: charmerci on 24 Jun 2019, 02:31 pm

Wow. What's with the high frequency rise?

It's some cone breakup plus some beaming. Probably they are allowing the center of the dust cap to flop a little to act like a tweeter. Actually the FR looks pretty good compared to many FR drivers. FR are intended to be listened off axis, which filters out the beaming highs.

FullRangeMan · « **Reply #5 on:** 24 Jun 2019, 03:31 pm »

It could nice to listen a comparative test with the 4'' alu cone brother:
https://www.madisoundspeakerstore.com//approx-4-woofers/sb-acoustics-sb12pac25-4-4-aluminum-cone-woofer/#tab-1

FullRangeMan · « **Reply #6 on:** 25 Jun 2019, 11:02 am »

Cone breakups will appear in the impedance line.

gab · « **Reply #7 on:** 26 Jun 2019, 01:15 pm »

Here is an open baffle enclosure to try them on

https://www.diyaudio.com/forums/full-range/223313-foam-core-board-speaker-enclosures-post5809767.html

WillyBoy Audio · « **Reply #8 on:** 26 Oct 2019, 03:54 pm »

I bought a pair of these. They are well made and initial testing does not reveal any strange character.
I intended to put them on an enclosure I already have, but the existing hole is too big for this driver. Anyone has a recommendation for suitable enclosure?
It has a high Qts of 0.92, and what I've learned so far suggests that suitable options are either sealed or aperiodic enclosure. Some suggests mass-loaded transmission line (MLTL). Any thoughts please? Thanks.

FullRangeMan · « **Reply #9 on:** 26 Oct 2019, 04:36 pm »

Madisound recommed very small enclosure as the VAS = 1.2L
I should use a bigger enclosure and lots of car hood brown stuffing to more bass.
Suggested Enclosure
1.5 liters sealed and stuffed for F3 of 99 Hz
2 liters sealed and stuffed for F3 of 97 Hz
3 liters sealed and stuffed for F3 of 94 Hz

FullRangeMan · « **Reply #10 on:** 26 Oct 2019, 05:35 pm »

SBA also have other similar 4'' FR driver with neutral sound alu cone with recommended 5.6L enclosure that can down to 50Hz.
https://www.madisoundspeakerstore.com/approx-4-woofers/sb-acoustics-sb12pac25-4-4-aluminum-cone-woofer/#tab-1

WillyBoy Audio · « **Reply #11 on:** 28 Oct 2019, 04:16 am »

Quote from: FullRangeMan on 26 Oct 2019, 04:36 pm

Madisound recommed very small enclosure as the VAS = 1.2L
I should use a bigger enclosure and lots of car hood brown stuffing to more bass.
Suggested Enclosure
1.5 liters sealed and stuffed for F3 of 99 Hz
2 liters sealed and stuffed for F3 of 97 Hz
3 liters sealed and stuffed for F3 of 94 Hz

Hi FullRangeMan (do you use the same username on that other forum?)

I played around with WinISD and found the following, all sealed and stuffed:
10 liters, Qtc 0.99, F3 75.8Hz (Golden Ratio: 348*215*133mm enclosure)
5 liters, Qtc 1.034, F3 77.5Hz (Golden Ratio: 276*171*106mm enclosure)
3 liters, Qtc 1.089, F3 80.9Hz (Golden Ratio: 233*144*89mm enclosure)

I kinda think a wide and shallow golden ratio will look good, with mirror-image driver placement slightly off center. Also hoping it will help with diffraction.
At the same time, the dimension for the 5 liter sim above is similar to various folded TL designs for FF85WK, for example. I know the two drivers have different specs, but would you think it's possible to sim a folded TL for the SB10?
What do you think?

FullRangeMan · « **Reply #12 on:** 28 Oct 2019, 04:31 am »

would you think it's possible to sim a folded TL for the SB10?
The software have to offer the option of TL calc, not sure what are the ideal TL driver requirements, hobbists mostly used Morel drivers to TL floorstanders.

JLM · « **Reply #13 on:** 28 Oct 2019, 11:17 am »

Quote from: FullRangeMan on 28 Oct 2019, 04:31 am

would you think it's possible to sim a folded TL for the SB10?
The software have to offer the option of TL calc, not sure what are the ideal TL driver requirements, hobbists mostly used Morel drivers to TL floorstanders.

This 3 inch SB Acoustics driver has typical small driver inefficiency with lack of bass and ultimate output. Best used for desktop applications. TL application would be an exercise in frustration. Note that most TL drivers have Qts of around 0.4, not 0.9 (which indicates open baffle use, but would produce no bass and have very limited output in-room).

The 4 inch driver is a smidge better, but still apparently designed for desktop or small room use.

WillyBoy Audio · « **Reply #14 on:** 29 Oct 2019, 01:43 pm »

@FullRangeMan and @JLM: Thank you, I appreciate your input. I do have desktop application in mind. It seems sealed and stuffed is the way to go in this instance. Thanks again.

planet10 · « **Reply #15 on:** 30 Oct 2019, 03:05 am »

Quote from: FullRangeMan on 28 Oct 2019, 04:31 am

would you think it's possible to sim a folded TL for the SB10?

With a Q as high as the 3” have, a midTweeter, or possibly the Frugel-Horn Lite, the cabinet dominates so they should work. Same with the 4” in FH3.

A TL would likely need to be aperiodic (or close), or have a bump at the bottom.

Another driver brand i haven’t tried. the brand has a good rep.

dave

Norman bates · « **Reply #16 on:** 2 Dec 2019, 03:24 am »

Neat little driver

FullRangeMan · « **Reply #17 on:** 2 Dec 2019, 03:51 pm »

@Planet10: Thanks Dave

FullRangeMan · « **Reply #18 on:** 2 Dec 2019, 04:24 pm »

Quote from: WillyBoy Audio on 28 Oct 2019, 04:16 am

Hi FullRangeMan (do you use the same username on that other forum?)

I played around with WinISD and found the following, all sealed and stuffed:
10 liters, Qtc 0.99, F3 75.8Hz (Golden Ratio: 348*215*133mm enclosure)
5 liters, Qtc 1.034, F3 77.5Hz (Golden Ratio: 276*171*106mm enclosure)
3 liters, Qtc 1.089, F3 80.9Hz (Golden Ratio: 233*144*89mm enclosure)

I kinda think a wide and shallow golden ratio will look good, with mirror-image driver placement slightly off center. Also hoping it will help with diffraction.
At the same time, the dimension for the 5 liter sim above is similar to various folded TL designs for FF85WK, for example. I know the two drivers have different specs, but would you think it's possible to sim a folded TL for the SB10?
What do you think?

Hi Willy, excuse me this late reply seems I have missed your post

Golden ratio enclosures always good, it dismiss the use of internal bracing, mirror image also good, but even the mentioned 10L enclosure goes only to 75Hz what is too discreet bass performance to a satisfactory listening, hence this I would go with the Frugal Horn as Suggested by Dave, in second place a even bigger Bass Reflex box to additional bass reinforcement.

Seems the SB12 can delivery more bass(Fs 52Hz) than the SB10 Fs89, Iam thinking in fullrange use no subwoofer.

Norman bates · « **Reply #19 on:** 2 Dec 2019, 11:51 pm »

neat tip on golden ratios for box.