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Extended CB-18 Cyclops |
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streetsounds 
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Joined: 12 July 2008 Location: Santa Rita Status: Offline Points: 301 |
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 Posted: 01 December 2010 at 2:08pm |
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I could not able to test it fully, neighbors are screamin', but even with a very small volume adjusment you feel the bass. With just 2 cyclops the bass was intense., I just noticed the driver cone moves a lot, Maybe i need to high pass it to around 40 to 45hz
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Bass matters...
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staiper
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Joined: 26 February 2004 Location: Croatia Status: Offline Points: 545 |
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Posted: 01 December 2010 at 3:46pm |
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35Hz L/R or Butterworth 24db/oct will provide enough mechanical protection even on highest power.
If you feel that you really passing safe margins you may set it up to 40Hz.. above that there is no more point of rising HPF to protect driver , only reason for further rising may be to "preserve" some amplifier power headroom. Also to note it is not good to completely minimize or "kill" cone movement as it is very important for voice coil cooling / air flow around VC gap and through magnet structure. By totally reduced cone movement it is much easier to fast increase power compression and turn speaker unit into audio driven heater and under that conditions it is easy to burn voice coil as you cant hear any distortion and its sound level seems lover (and it most likely really is.. due to heating/power compression) than you used to use before. Some companies especially for bass cabinets intentionally recommend lower HPF filtering points that theory suggests as safe to improve that cooling effect by intentionally allowed bit of extra-excursion (but for that they select or design drivers so they can be confident that mechanical damage point is still far from voice coil "reach" and that extra bit of excursion do not make unwanted audible noises) BTW .. only on very close listening , most of bass drivers on back side may produce slight air "chufing" tones by the magnet pole-hole. This may be audible only on close listening a.k.a. "head in speaker" and it is not audible at all and will not affect sound when you move even 50-60cm away. ..just in case to not confuse this with real "cone farting"  Best wishes, Stipe Edited by staiper - 01 December 2010 at 8:57pm |
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Just do it! ..or do not.. ;)
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streetsounds
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Joined: 12 July 2008 Location: Santa Rita Status: Offline Points: 301 |
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Posted: 05 December 2010 at 2:47am |
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Yup I did it last night Stipe killed freqs below 35hz and low pass it to 140hz. I rigged it up with the live band and with just 2 cylops a side the bass was amazingly intense, finally managed to tune it properly. Its a very efficient box I would say, small amount of power exerts lots of bass. I could say that this is a "power amp friendly bass bin", you dont need to push the amp that hard to meet the bass you want., I think this CBe-18 will outrun many sub bin design..but thats just me. Thanks for the design and for the tips Stipe.
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t.geessounds
Young Croc 
Joined: 10 May 2010 Location: US... New york Status: Offline Points: 908 |
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Posted: 05 December 2010 at 3:54pm |
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r u guys putting out the extened palns???
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streetsounds
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Joined: 12 July 2008 Location: Santa Rita Status: Offline Points: 301 |
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Posted: 05 December 2010 at 11:01pm |
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Here's the plan link, took a while to figure out how to share it
http://www.4shared.com/document/IEzkx4z_/Cyclops_CBe-18_standard_extend.html Edited by streetsounds - 06 December 2010 at 7:11am |
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t.geessounds
Young Croc
Joined: 10 May 2010 Location: US... New york Status: Offline Points: 908 |
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Posted: 06 December 2010 at 1:51am |
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the link is open small cant read
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Centauri
Old Croc 
Joined: 29 November 2004 Location: Newcastle Aus Status: Offline Points: 1792 |
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Posted: 06 December 2010 at 5:50am |
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You have to download the file via the download now button ... |
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Louder than loud
Old Croc
Joined: 13 May 2010 Location: Guildford Status: Offline Points: 2377 |
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Posted: 06 December 2010 at 5:51am |
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love the look of these :)
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streetsounds
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Joined: 12 July 2008 Location: Santa Rita Status: Offline Points: 301 |
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Posted: 06 December 2010 at 7:13am |
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Yes you have to download it and you must have an acrobat reader |
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Danny A
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Joined: 30 May 2009 Status: Offline Points: 444 |
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Posted: 06 December 2010 at 8:22pm |
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Hey Streetsounds, your build looks really good, interesting finish, Ive neverseen it before. Wheel boards looking good too
 What tops are you using? DIY? |
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Ibex
Young Croc
Joined: 27 May 2009 Status: Offline Points: 1013 |
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Posted: 06 December 2010 at 9:47pm |
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+1
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streetsounds
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Joined: 12 July 2008 Location: Santa Rita Status: Offline Points: 301 |
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Posted: 07 December 2010 at 8:23am |
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Yup some sort of a DIY midtop. Thats a double 12" mid with hi comp driver at the center similar to mT 122 but shorter and deeper. Drivers installed are 2 PAudio C12 500MB for the mids and PADE99 for the hi. |
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Bass matters...
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t.geessounds wrote: