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THAM 12 - a compact 12" TH

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martinsson View Drop Down
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    Posted: 15 March 2012 at 8:48pm
This is the THAM12 :

http://www.martinsson.cc/blog/index.php?m=03&y=12&entry=entry120315-210219

It's rougly half the size of the THAM15 (35x50x55cm) but is still granting usefull 50Hz response with a 100dB/W/m sensitivity flat on open ground, the driver choosen as default example is the Beyma12LX60V2.

Once again Johannes Rodin is to blame for yet another new THAM design seeing the light of day, his first words where "- it's tuned to low and the enclosure is to big" but eventually he came around to seeing it my way :)

The blog is now updated, but will continue to be worked on.

Best reg's // Martinsson


Edited by martinsson - 31 March 2012 at 3:14pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote login4 Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2012 at 8:58pm
great, ill looks forward to it, thanksBig smile


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Post Options Post Options   Thanks (0) Thanks(0)   Quote goodgroove Quote  Post ReplyReply Direct Link To This Post Posted: 15 March 2012 at 9:17pm
Would jbl 2206 or 2204 drivers be suitable for this design as I have some available ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote martinsson Quote  Post ReplyReply Direct Link To This Post Posted: 17 March 2012 at 8:59pm



More info and simualtions are now available on the blog.

As for the JBL drivers, i have no idea I'm afraid, give hornresp a try and let me know what you find, all the info is available.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2012 at 4:14am
This is not a THAM 12, but a similar (but larger) TH using the JBL 2206.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote martinsson Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2012 at 3:10pm
I recently heared thatt he JBL GTI1200 will work fine in th THAM12 and I will look into this as soon as possible, when doing so I'll se i f i can have a go at the JBL's asked for here aswell.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote martinsson Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2012 at 10:52am
JBL 2004H :


JBL 2006H :


Compared with a modern driver, let's say the B&C 12PS100 :



Or the original Beyma 12LX60 from rougly the same age (?) :




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Post Options Post Options   Thanks (0) Thanks(0)   Quote GekoMusic94 Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2012 at 10:59am
This seems similar to the MTH-30Smile good job martinssonClap
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Post Options Post Options   Thanks (0) Thanks(0)   Quote martinsson Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2012 at 11:59am
Thanks, but I'm not sure that's a fair comparison, the MTH-30 is 68x34x57cm (131,7 liters) exteral volume, the THAM12 is 55x35x50 (96,2 liters) and this difference (~37%) will not go unnoticed, see this as a more compact alternative, not a competitor, the MTH-30 is a great design and well proven in the field aswell.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 27 March 2012 at 7:11pm
Originally posted by martinsson martinsson wrote:

I recently heared thatt he JBL GTI1200 will work fine in th THAM12 and I will look into this as soon as possible, when doing so I'll se i f i can have a go at the JBL's asked for here aswell.


Interesting. Thats a car subwoofer right ? Is it one of the ones with REALLY low Fs and low efficiency ?

I'm asking because I have here a 12" (ish - actually more like 11") bass driver branded Kicker. Was originally in a compact reflex box (with amplifier as active sub) .... now I have the amplifier also - very power-efficient (think it must be class D) .... only 50W RMS  but great for portable battery-powered small setups I use.

Thing is, this driver is (obviously) a great match for the amplifier (decent cone area, 2R impedance, and matching power handling). Now during trying to look up info on this Kicker thing, I came across comments from the car audiophile types to the effect that "plays very good level, but not real deep".
This - plus the feel of the surround - makes me think its not really like typical "2000W" Fs=20Hz, efficiency=86dB car subs ..... a bit more like PA bass drivers - or mebbe more like hi-fi drivers.
Certainly that 50W amplifier was REALLY throwing the cone around in free air ....
Other nice thing is that its really light-weight (smal magnet).

Anyway - I got to thinking - wonder if that driver could be made to play at half-decent efficiency in a compact horn-loaded cab - like maybe Cubo or some such. Or .... THAM 12 ?
Is there a chance it could work in a THAM12 ? What are the main determinants of the suitability of the driver ? .... I have no info this one at all .... but could mebber try to measure Fs at least with the rice trick LOL

If it could play between 50 and 100 or so with improved efficiency I'd be well chuffed !!

Thanks for any thoughts ..... even if its "nah forget it mate" Smile


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Post Options Post Options   Thanks (0) Thanks(0)   Quote martinsson Quote  Post ReplyReply Direct Link To This Post Posted: 28 March 2012 at 8:53am
The JBL GTi1200 was not a very good match after all :



Take a look at my homepage, there you'll find approx 30 simulated drivers, from these you might be able to draw conclusions or perhaps find another more suitable candidate.

A BL value around or in excess of 20 is a good start.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote martinsson Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2012 at 4:54pm
I better post this simulation to regain some credabillity :)

The Faitalpro 12FH500 :


or perhaps the...

The BMS 12N804 :


or why not put on the spending trousers and go for...

The Beyma 12P80Nd :





Edited by martinsson - 29 March 2012 at 4:57pm
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