THAM 12 - a compact 12" TH |
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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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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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Swedish Pro-fi diy-nerd - http://www.martinsson.cc/blog/
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login4
Old Croc Joined: 03 April 2006 Location: Wales Status: Offline Points: 1552 |
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great, ill looks forward to it, thanks
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CELTIC SUBSONIC SOUND SYSTEMS
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goodgroove
Young Croc Joined: 21 December 2005 Status: Offline Points: 631 |
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Would jbl 2206 or 2204 drivers be suitable for this design as I have some available ?
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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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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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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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This is not a THAM 12, but a similar (but larger) TH using the JBL 2206.
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djk
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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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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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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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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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GekoMusic94
Registered User Joined: 03 February 2010 Location: Italy Status: Offline Points: 469 |
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This seems similar to the MTH-30 good job martinsson
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https://soundcloud.com/dj-uber
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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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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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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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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 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" |
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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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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martinsson
Registered User Joined: 19 June 2007 Location: Sweden Status: Offline Points: 325 |
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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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