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Big Bad Speakers |
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volcano 
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Joined: 23 September 2004 Status: Offline Points: 106 |
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 Topic: Big Bad SpeakersPosted: 16 October 2004 at 5:07pm |
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Hi there, I have some Belgian handmade speakers somewhere in a far away corner. These speaker are very well and heavy build (around 15 kg/p with big magnet and heavy alu frame), but I havn't got a clue to do with them I once phoned the manufacturer (a Canadien who worked at cervin wega before and now lives in Brussels strating his own brand) and he didn't want to give plans, but he gave me the T&S parameters I once calculated a BR box (around 200l and tuned at 35 Hz) and it sounded awfull... can anyone take a look at the specs and suggest me something (my speaker design capabilities are very limited)? Model: Techno Voice GTS 18B SD: 1080 cm² Vas: 353.286 Cms: 2.17E-04 m/N Cas: 2.52E-06 m^5/N Mmd: 85.2 gr Mms: 105.28 gr Rms: 3.9 Ns/m Fs: 33.3 Hz Bl: 23.17 N/A Re: 4.71 ohm Qms: 5.65 Qes: 0.19 Qts: 0.19 Pmax: 600 W Xmax: 13.64 mm h: 9.09 mm t: 22.73 mm Hope this will do Cheers |
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freddyi
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Joined: 22 September 2004 Status: Offline Points: 936 |
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Posted: 16 October 2004 at 5:20pm |
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FWIW "may" work well in original 1951 Karlson box for short throw
although Qe suggests a horn - Contour used Craaft 18 in 15"
Karlson - ask him for opinions vs horn application - it may work well
in Rog's horns
your driver has incrediblycool specs - this type with low mass isn't seen other than AA Craaft and your Vas must be higher plus more motor and much more xmax for "fun" look at this bassbin plan Cetec-Gauss K18 http://home.earthlink.net/~buddhaboy2/GK |
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mobiele eenheid
Old Croc 
Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Posted: 16 October 2004 at 5:46pm |
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Such a speaker isn't meant for bas reflex... as you already discovered yourself You should be able to use it, in most designs that are also suitable for the Void V18 1000. So either a folded horn or a (6th order) bandpass would do the trick. What do you have in mind/ what do you use on top?
Cheers |
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Timber_MG
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Joined: 27 March 2004 Location: South Africa Status: Offline Points: 1454 |
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Posted: 16 October 2004 at 5:57pm |
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This speaker has en extremely light cone for its size and a low qts to
boot. Smells like a classic horn-speaker to me, and with not half bad
parameters to boot (if they can be trusted, which I'd assume)
Martin |
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volcano
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Joined: 23 September 2004 Status: Offline Points: 106 |
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Posted: 16 October 2004 at 5:57pm |
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If it could play with a 12 inch 400 W bass reflex with a 2inch driver, it would be perfect! But as I understand, I can put them in the X1??(I have also some heavier tops) What other desings do you think about? |
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tb_mike
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Joined: 01 October 2004 Location: New Zealand Status: Offline Points: 2744 |
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Posted: 17 October 2004 at 9:19am |
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Exponential 2metre horn with 4,000cm^2 mouth area 600cm ^2 throat area 77litre Rear chamber(or open back if you prefer scoop nonlinearities) Results in ~55hz bass |
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magic_mike
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Joined: 01 June 2004 Location: Canada Status: Offline Points: 9 |
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Posted: 18 October 2004 at 2:39am |
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freddyi
I had a look at the Karlson cabinet link. When I looked at the drawings, it appeared there was no porting. I thought the Karlson was a big bass reflex cabinet with a funny looking curtain in front of it. I ask, because I'm looking for something to put a set of four 18" cetec-gauss loudspeakers in. I bought them some years ago, but haven't had the heart to build cabs for them because the time and wood and storage invested to put the cabinets together. I want to put them in something compact but efficient. They must go loud and I'd like to see them get down to 40hz before they fall off. This seems almost impossible in a small cabinet, but, hope springs eternal. I've been scouring the web to find a set of drawings for the cetec gauss K-18 and the electrovoice sh1810 cabinets. Now in the last month, I've found both. Bless this forum and all those who sail her! If anyone has any feedback or suggestions regarding cabinet selection, I'd be very happy to hear it. Thanks in advance Mike |
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freddyi
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Posted: 18 October 2004 at 4:09am |
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hi magic-mike - K's are 'generally' ported - 1951 Karlson has
~40sq.in.rangin down to>32sq.in. and Cetec Gauss similar -
with limited experience I think they are OK for compact box - wing flare rate and itnial gap width seems to influenece things - not as much gain overall as a horn but seems like the cone is loaded well - will assume (hope) C-G did some prototyping before releasing their verison K18 from Gauss might hit pretty hard - a higher apsect might do better but take some work to find out. this is one cool forum -( hope I'm not muckin' it up) Best, Freddy |
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Tom Umney
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Joined: 26 February 2004 Location: United Kingdom Status: Offline Points: 4954 |
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Posted: 19 October 2004 at 1:27am |
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I don't like Gauss/Celtec-- no vent on pole piece for cooling and that big black 'heatsink' thing is actually just for looks i think, because i unbolted 1 off a 12 inch Gauss 4212 and it has ceramic magnet underneath and 'heatsink' don't touch magnet just floats on 4 screws.But I unbolted another Gauss 'heatsink' and it had alnico magnet.No pole piece vent might be ok for midrange use-- but certainly not for bass. So i can see them Gauss voicecoil's burning up unless the 18 inchers 'heatsink' is actually a heatsink not some fancy thing for looks! |
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magic_mike
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Joined: 01 June 2004 Location: Canada Status: Offline Points: 9 |
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Posted: 19 October 2004 at 10:13pm |
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Sorry Toxic
Gauss may not be to your liking, but when they were built they were well ahead of their time. They have 4" voice coils and double spiders. They were the only drivers built in the early seventies with those features. When those were built, you had the choice of Electrovoice, JBL and Gauss (at least if you were building professional loudspeakers, not toys). I like all of those, but the Gauss were the industry leaders at the time. Nothing else could touch them as far as power handling and efficiency went. Nowadays, there are lots of loudspeaker manufacturers who put together some very nice product. I'm sorry you don't like Gauss, but Gauss is what I have, so that's what I'm gonna work with. I wish I had the money for P-audio or Void, but if wishes were fishes... So if someone has some suggestions about a cabinet for them, thanks. I'm gonna try to find the T/S parameters and see if it's worth the effort. Since I'm pretty backwards, I don't have a windows based machine and therefore can't do any of the wonderful horn calculations you all can do. Any help would be greatly appreciated |
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volcano
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Joined: 23 September 2004 Status: Offline Points: 106 |
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Posted: 19 October 2004 at 11:49pm |
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A truth Magic Mike, in the days you hadn't much choice! Or you had the over expansive JBL's or EV's or Gausses or... They costed a lott (and still do) but they had the best sound and could play at far the loudest!! (old time days But to, TB Mike, does it mean that I can use the sooper scooper with my Electro Voices? or do you have other designs in mind?? |
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volcano
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Posted: 19 October 2004 at 11:50pm |
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Sorry, I don't mean Electro Voice but Techno Voice!! (how confusing)
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(calculated with Lasip)
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) Now adays .... its just the choice between collapsing lung sound or a brain damage sound, just depends on what music you perfer(