Advice for purchasing a 10-12in woofer

[bogdan2011]

I'm looking for a kind of sound reinforcement woofer for a bedroom (not that kind of car-audio sub) and I'm not sure what to look for.
Some candidates:

Beyma SM-110/N

Fs 43 Hz
Re 6.2 Ω
SMC 7.88
Qes 0.37
Qts 0.35
Vas 65 l
Cms 368 μm/N
Rms 1.3 kg/s
η₀ 1.4 %
Sd 0.0355 m2
Xmax 4 mm
Xpp 28 mm
Vd 141 cm3
Mms: 0.038 kg
Bl: 13.2 N/A
Le 1.7 mH

Good Fs and Vas but small Xmax

Beyma 12BR70

Fs 31 Hz
Re 5.6 Ω
SMC 4.44
Qes 0.56
Qts 0.50
Vas 142 l
Cms 345 μm/N
Rms 3.3 kg/s
η₀ 0.76 %
Sd 0.0550 m2
Xmax 8 mm
Vd 340 cm3
Mms: 0.074 kg
Bl: 12.1 N/A
Le 0.85 mH

Better Fs and Xmax, but high Vas

Beyma SM-212


Fs 40 Hz
Re 5.8 Ω
SMC 5.6
Qes 0.4
Qts 0.38
Vas 150 l
Cms 350 μm/N
Rms 1.8 kg/s
η₀ 2.3 %
Sd 0.0550 m2
Xmax 7 mm
Xpp 27 mm
Vd 382 cm3
Mms: 0.044 kg
Bl: 12.8 N/A
Le 1.2 mH

These are easily available where I live and also cheap.

The enclosure will be either closed or one of the projects presented here (THAM12, Keystone etc)

 

[Inductor]

If for a sub, it all depends, you mention all range? sound reinforcement woofer, the BEYMA 12BR70 v2014, VB = 150.0 L, FB = 27/28 Hz should be adequate as a subwoofer in a reflex enclosure. Just one of the options.
http://www.beyma.com/getpdf.php?pid=12BR70
Attention that the Beyma SM-212 has two versions, also.
http://www.beyma.com/getpdf.php?pid=SM-212
Fs (Hz), Vas (L), Qts, Xmax (mm), dB/2.83V/m
BEYMA SM212 v2009, 31, 8 Ohms, 40.00, 150.00, 0.373 ± 7.0 97.2
BEYMA SM212-N2, 31, 8 Ohms, 43.00, 103.00, 0.372 ± 8.3 96.7

 

[bogdan2011]

Not all range, it will be cut at around 150Hz.
What's more important here? The Xmax or the Vas?

 

[chris661]

Depends on what you want to use them for.

Do you have any targets on maximum SPL, low-frequency cutoff, or box size?
Do you have an amplifier already, or is this part of the budget?

Chris

 

[Zwiller]

The SM212 simmed pretty dang good in the THAM15 but completely OVERKILL for a bedroom IMO but who am I to judge 😀 Well over 130db in a corner with 150W.

 

[bogdan2011]

I have a stereo amp which is rated at about 85W per channel, and I'm planning on running it bridged.
It will be used in a bedroom and possibly in the back yard for small parties.
The cutoff frequency will be at 100-150Hz, so it should go as low as possible below that. The rest is covered by an active system I made, but which has trouble going below 100Hz.
As for the box, I like the idea of horns like THAM12. THAM15 would be too big in size.

 

[bogdan2011]

Simmed in closed enclosures, 12BR70 goes lower but someone told me that it did not simmed well in THAM12.
SM110 and SM212 are on par, but obviously SM110 has lower SPL and needs a smaller enclosure.

 

[Zwiller]

Yep, me 😀 http://www.diyaudio.com/forums/subwoofers/209372-tham12-compact-12-th-2.html

Bass reflex with 12BR70.

 

[Inductor]

BRs are difficult to beat in LF content/extension. Why did you mention "closed", is that a sealed speaker? Confused here... The Beyma 12BR70 is excelent for an hi-fi sealed speaker as a second choice, superior to any other (make it first), not for PA/SPL. But you will be the judge.
Note: only 40w in a sealed (no correction) 106dB, and ~113dB in a BR with more power @Xmax.
For SPL get the 4waves, horns or BLH but you don't go deep and need electronic correction/protection.

 

[bogdan2011]

Why did you mention "closed", is that a sealed speaker?

Yes, it's sealed, my mistake 🙂

 

[Djim]

I'm looking for a kind of sound reinforcement woofer for a bedroom (not that kind of car-audio sub) and I'm not sure what to look for... ... ...These are easily available where I live and also cheap... ... ... The enclosure will be either closed or one of the projects presented here (THAM12, Keystone etc)

Hi bogdan2011,

Perhaps the Thomann 12-280/8-w may interest you. It's an inexpensive driver (55€) that works great in TH's.

Cheers,
Djim

 

[bogdan2011]

It looks good and the price is attractive, however the xmax is missing from the data sheet.

 

[Djim]

Hi bogdan2011,

Mesaured specs can be found here
Xmax = 5,1mm
(Hvc-Hg)/2 + 1/4 Hg

On quiet a few European forums you can find info and user comments on this driver. I think it has a very good price/performance ratio.

Cheers,
Djim

 

[Zwiller]

12-280 doesn't sim the greatest (not much does) in the THAM12.

 

[Djim]

12-280 doesn't sim the greatest (not much does) in the THAM12.

Hi Zwiller,

Doesn't??? 🙂

Cheers,
Djim


Original simulation of the tHAM12 with 12-280/8-w

Alternative simulation (more accurate) of the Tham12 with 12-280/8-W

Thorn F1 design with 12-280/8-W

An externally hosted image should be here but it was not working when we last tested it.

MTH30 design with 12-280/8-W

 

[Zwiller]

Somethings amiss. I double checked my HR inputs and they match but yet the sim is a one note wonder around 70hz... In any event, I trust your sims and they look great! I am partial to the THORNF1.

 

[Zwiller]

Looks like the THORN F1 is basically a modded THAM15 (too big). Djim, can you please post your HR inputs? I suspect you took them from the sketch and are better than the HR screen posted I'm using.

 

[Djim]

Hi Zwiller,

Thanks, you seem to be awake 🙂
I took the wrong simulation of the Thorn-F1.
Here you have both, original simulation and a more accurate one with the input screens.

Cheers,
Djim


original:

alternative:

 

[Brian Steele]

Hi Zwiller,

Thanks, you seem to be awake 🙂
I took the wrong simulation of the Thorn-F1.
Here you have both, original simulation and a more accurate one with the input screens.

Cheers,
Djim


original:

alternative:

Both of those have issues as the volume of air contained in the driver's cone is not addressed in the sim (using Vtc and Atc).

 

[Djim]

Both of those have issues as the volume of air contained in the driver's cone is not addressed in the sim (using Vtc and Atc).

Hi Brian.

In the alternative sim the cone volume is counted for.

Cheers,
Djim