A-level sub project

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   Ok, after spending all day comparing drivers I've decided on a Beyma 15" G40.
I've also worked out costs and it should be about �200 before timber and a grill so probably around �300, although my school may be able to supply some of the timber.
Thanks for all your help, just got to design the cab now 
Chris

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Chris Rolt Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 15 September 2004 Status: Offline Points: 10	Post Options Post Reply Quote Chris Rolt Report Post Thanks(0) Quote Reply Posted: 20 September 2004 at 5:19pm
	Ok, after spending all day comparing drivers I've decided on a Beyma 15" G40. I've also worked out costs and it should be about �200 before timber and a grill so probably around �300, although my school may be able to supply some of the timber. Thanks for all your help, just got to design the cab now Chris

RayVaughn Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 20 August 2004 Status: Offline Points: 62	Post Options Post Reply Quote RayVaughn Report Post Thanks(0) Quote Reply Posted: 22 September 2004 at 4:29pm
	Since you're not paying for your time in building this box then you can afford to go to town on the woodwork. Try and brace all the sides as effectively as possible. Use thin mdf or ply to span the internal cavity. This should be realtively easy with a reflex cabinet. More bracing increases weight and volume but can improve the sound a lot. Most cheap cabinets suffer from ugly sound colouration due to the wooden panels resonating.
	--------------- Ray Vaughn and on www.innerfield.co.uk www.rocketfestival.com

staiper Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 26 February 2004 Location: Croatia Status: Offline Points: 545	Post Options Post Reply Quote staiper Report Post Thanks(0) Quote Reply Posted: 22 September 2004 at 7:55pm
	If you like punchy bass more than low/slow try my bandpass horn. Maybe it is good option for you.. (I am using them in stacks of two to eight per side..) but even single cabinet produce pretty solid lows (-3db @ 54Hz). plans: http://groups.msn.com/SpeakerBuildingpics/shoebox.msnw?actio n=ShowPhoto&PhotoID=19

Jez_Ultra Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 26 February 2004 Location: United Kingdom Status: Offline Points: 334	Post Options Post Reply Quote Jez_Ultra Report Post Thanks(0) Quote Reply Posted: 22 September 2004 at 10:30pm
	I reckon a reflex box is going to be the easiest to design, build and would suit your requirements better than a bandpass or horn design. twin 15's are out due to the size restriction, and a single 15 a bit weedy, go for a single 18". Thomann are selling RCF 18P300's for about �180 quid (i waiting for some abuse). download a copy of winISD from http://www.linearteam.dk/ and look at some other resources on the net and you shouldn't have any problems designing a reflex box.

Andrew Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 10 March 2004 Location: United Kingdom Status: Offline Points: 669	Post Options Post Reply Quote Andrew Report Post Thanks(0) Quote Reply Posted: 23 September 2004 at 6:29am
	Part of the project could be to optimise speaker box side ratios whilst having minimal sheet wastage. Of course offcuts can be used to help brace the cabinet. My reflex cabs have three brace pieces to stop vibrations and help support further cabinets.