make yer own servodrive
Printed From: Speakerplans.com
Category: Plans
Forum Name: New Projects Forum
Forum Description: Forum for new speakerplans projects, in memory of Tony Wilkes, 1953 - 2014
URL: https://forum.speakerplans.com/forum_posts.asp?TID=1954
Printed Date: 26 March 2026 at 7:10pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: make yer own servodrive
Posted By: Rog
Subject: make yer own servodrive
Date Posted: 01 June 2005 at 6:31am
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anyone fancy trying this? http://wanderkolonie.org/servod.htm - http://wanderkolonie.org/servod.htm seems like a lot of effort to me but you're certainly one step closer to the brown note if thats yer thing.
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Replies:
Posted By: james folkes
Date Posted: 01 June 2005 at 7:50am
wow, i've not seen that page in years! i do remember pictures of this cabinet in use in a barbecue environment. it looks wicked, but where do you get servo motors like that on the cheap? also, the belt/pully arrangement must be very well engineered. if i wasn't already finishing 8 midhorns, building 16 basshorns, 2 bandpass subs, 2 4-way horn loaded mid tops, some hf unit housings and some monitors i'd seriously think about it. damn, i need wood. got the drivers, just need the wood. james. edit: html |
biotec wrote:Posted By: james folkes
Date Posted: 01 June 2005 at 7:51am
| hmm. that html went bad. |
Posted By: norty303
Date Posted: 01 June 2005 at 8:03am
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missed a '/' out of the last quote tag ------------- My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers |
Posted By: james folkes
Date Posted: 01 June 2005 at 8:09am
| cheers norty! james. |
Posted By: tb_mike
Date Posted: 01 June 2005 at 6:01pm
 E X C E L L E N T! I was wondering what sort of motors were required!!!!
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Posted By: _djk_
Date Posted: 01 June 2005 at 6:58pm
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A local sound company has a set of eight ServoDrive BassTech 7s. They require fairly regular work on the belts, idlers, and the PRs as well. Newer 15s have the same displacement as the PRs do on the BT7, and with XBL^2 technology are very efficient too. A single Atlas 15 will have as much displacement as the two Lab 12 drivers. I would build a scaled up version of the the B-DEAP design for 15" drivers. The B-DEAP design looks much simpler inside than the Lab-12. ------------- djk |
Posted By: norty303
Date Posted: 01 June 2005 at 7:00pm
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I've been curious for a while why PA manufacturers haven't produced drivers like some of the sub drivers i've come across whilst browsing diyaudio forum. some of them have silly xmax and huge magnets. Are they simply not as durable for PA applications? ------------- My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers |
Posted By: LunchieTey
Date Posted: 01 June 2005 at 7:25pm
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And rather inefficient. Although the Labs are like this too. Maybe the ridiculous x-max and heavy cones don't like the massive excursion for extended periods of time,unlike movies where it is only for short periods? Don't forget that most commercial cabs are looking at 40-120hz bass and need punch and speed,not 15hz in room extension! Every sub would basically need to be a folded horn. ------------- Speaker addict |
Posted By: freddyi
Date Posted: 01 June 2005 at 7:50pm
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hey DJK - how are new Atlas 15 built? - or is it discontinued - seems like they ditched XBL^2 licence. how about a diy Geddes lever and good conventional driver? can this be accomplished with two regular PR's coupled with alltread? - gotta be easier experiment than diy servodrive ! |
Posted By: _djk_
Date Posted: 02 June 2005 at 1:46am
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The Geddes Lever was very different when it came out, but I don't see a place for it other than as a novelty. I have no idea as to the new Atlas 15, but MTX is building dual gap drivers with no mention of XBL^2. Just have to wait and see. ------------- djk |
Posted By: tb_mike
Date Posted: 02 June 2005 at 4:25am
Youve seen the inside of a b deap?howso? Is it how I expect,with a tuned rear chamber tapped into the horn someway down the flare? |
Posted By: tb_mike
Date Posted: 02 June 2005 at 4:26am
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huge xmax,lack of sensitivity. |
Posted By: Timber_MG
Date Posted: 02 June 2005 at 4:36am
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I thought the B-DEAP was not "tapped" (whatever that may mean but I
share the same interpretation as mike) and a conical horn
(1/4wavelength somewhere to support 40Hz loading with the external air
path) High excursion drivers will generally sacrifice motor strength (though not always, Adire Tumult is one Yummy contra-sub-bass driver according to Leach math) |
Posted By: tb_mike
Date Posted: 02 June 2005 at 5:02am
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http://www.danleysoundlabs.com/PB12.html - http://www.danleysoundlabs.com/PB12.html The PB-12 has an astounding 10 dB more output in the 20-30 Hz range over Tom's previous Contra Bass design |
Posted By: tb_mike
Date Posted: 02 June 2005 at 5:04am
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ah now im confused as to which units are actually tapped or just 'external air path' |
Posted By: Timber_MG
Date Posted: 02 June 2005 at 5:10am
| External air path is the idea of a small mouth on a large baffle as I understand it (i.e. not from room boundary but virtual boundary) and the tapped horn is damping the speaker mechanically where a traditional horn doesn't. However I don't know the trade-offs in the designs and Tom isn't likely to comment on this methinks. |
Posted By: tb_mike
Date Posted: 02 June 2005 at 5:24am
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Martin - I realise recently in posts we are actually in agreement,but we misunderstand each other. It doesnt help that its secretive contents are hidden from view,check out the PB12-wheres the horn mouth |
Posted By: Timber_MG
Date Posted: 02 June 2005 at 5:38am
| Exactly, It's obviously different to what is traditionally understood to be a horn and probably closer to a scoop with a driver and vent(s) terminating somewhere into the "horn". He might also have a long "rear chamber" (like a really tweaked out folded bose cannon) |
Posted By: _djk_
Date Posted: 02 June 2005 at 9:36pm
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"Youve seen the inside of a b deap?howso? Is it how I expect,with a tuned rear chamber tapped into the horn someway down the flare?" http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220040238268%22.PGNR.&OS=DN/20040238268&RS=DN/20040238268 - http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Se ct2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrch num.html&r=1&f=G&l=50&s1=%2220040238268%22.P GNR.&OS=DN/20040238268&RS=DN/20040238268 You need a TIFF viewer, click on 'images'. ------------- djk |
Posted By: james folkes
Date Posted: 03 June 2005 at 7:55am
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not what i thought was in that box at all, but a very trick arrangement
nevertheless. that's the inside of a contra-bass is it? james. |
Posted By: minaximal
Date Posted: 03 June 2005 at 9:30am
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simple and yet brilliant variation on an idea! but its hard for me being a slight layman to work out what it is he's actually patenting... seems like he owns the rights to 0.5pi corner loading!? |
Posted By: Timber_MG
Date Posted: 03 June 2005 at 9:40am
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Not quite, this is the B-DEAP, not the Contrabass. Anyone know of a good TIFF plugin for Firefox that doesn't need registration / give up contact details for and evaluation version. |
Posted By: Centauri
Date Posted: 03 June 2005 at 9:44am
I use http://www.alternatiff.com/ - AlternaTIFF - works well with Firefox. Cheers Graeme |
Posted By: _djk_
Date Posted: 03 June 2005 at 3:58pm
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"simple and yet brilliant variation on an idea!" I think so too! "but its hard for me being a slight layman to work out what it is he's actually patenting..." Its pending, it has yet to be granted. Claims are usually as broad as possible at this stage, what they grant is a different story. "seems like he owns the rights to 0.5pi corner loading!?" Klipsch made similar claims for his Klipschorn, I don't think the Danley patent will be issued as written. ------------- djk |
Posted By: Timber_MG
Date Posted: 03 June 2005 at 4:13pm
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I am still not quite clear how he gets such huge directivity at LF, but
if the measurements were made in the farfield, then the results speak
for themselves. A baffle and altered terminus for the kick horn anyone? Perhaps he could sell his soul and get the Böse legal team loose on his patent ;-) Actually, it's about time Amar has his little .... claim .... set aside for good (alone for not being able to make them sound half-good at the asking price) |
Posted By: tb_mike
Date Posted: 03 June 2005 at 9:38pm
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Wonder if the driver is lab12 moded or TCsounds super woofer The internal folding is nothing special,its the simplest concept to use the enclosure as the boundary |
Posted By: _djk_
Date Posted: 04 June 2005 at 2:50pm
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I think it is a varient of the Lab-12 driver. In 10+ quantity the Lab-12 may be had for $115 in the USA. ------------- djk |
Posted By: Timber_MG
Date Posted: 04 June 2005 at 4:09pm
| That is silly money really. The local distributor wanted more than thrice that last time I enquired. |
Posted By: _djk_
Date Posted: 05 June 2005 at 6:08pm
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"That is silly money really. The local distributor wanted more than thrice that last time I enquired. " I agree, try and find something available locally that is equivalent and reasonable price. The driver in the Punisher looks good too. ------------- djk |
Posted By: tb_mike
Date Posted: 05 June 2005 at 11:49pm
I hope their not lying about the Xmax,its the highest ive seen on a prosound high Xmech driver,note the sensitivity is low so it could be true.
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Posted By: Contour
Date Posted: 06 June 2005 at 3:46am
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Caire 12.00SW has 33mm long voicecoil and 10mm thick pole plate. Best regards, Walt
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Posted By: tb_mike
Date Posted: 06 June 2005 at 7:45pm
Thanks walt,it certainly is a different prosound driver. Kind of like a lightweight cone lab12? |