Using existing Boxes for my EL70

[bobhowell]

I have a set of boxes from another build I would like to use for my EL70. 36"x7.5"x7.5",made from 3/4 wood, and has removable baffel. Volumn is 21L or .75 cf. This is very close to the Micro Tower single driver box. I could add a block to the bottem and make the interior the same, but larger volumn. Or I could just use Unibox to get a vent design to fit 21L. CSS says a 21L box is ideal and suggest a vent but it does not use the standing wave of the tall box. I know MK's MathCad sheets can do a better job, but I don't have Math Cad.

Does this box lend it's self to a Micro Tower Design, and if so, what would tube length/size be?

Thanks for the help

Bob

 

[Jim Shearer]

Bob,

I used to think I couldn't afford to use MJK's MathCAD worksheets because I couldn't afford to buy MathCAD (which I think goes for about $800 for the standard version.) Then I found out you can download a free version of MathCAD Explorer--available from several places, including Martin's site. There are also other ways to buy MathCAD for less as student versions and along with a book about how to use MathCAD (but I forget the name of it.)

And if you use a Mac rather than a PC, you can still run MathCAD using Virtual Box to run a copy of Windows on your Mac.

Cheers, Jim

 

[planet10]

Doesn't Bob put 2 EL70s intot he 21 litre box?

VirtualBox requires an Intel Mac to run (and some of us are still stretching our G4s & G5s -- those damn Macs just keep going & going)

dave

 

[bobhowell]

On checking I see he does use two in .75cf. So, .75cf is too big for one. Back to planning.

 

[AlejandroR]

I have just received my El70s. While I build the Coniston I have used and old .5 cu ft box. They sound better than expected out of the box. I am using a 6B4G S.E. amplifier @ only 3.5 watts and the sound is loud enough.

An externally hosted image should be here but it was not working when we last tested it.

 

[CSS/XBL]

They look good and they will only get better with more playing time.

All the best,

Bob

 

[italynstylion]

They look good and they will only get better with more playing time.

All the best,

Bob

I can attest to that. They get significantly better. If you like them out of the box then you'll really like what they can do later. I'm working on the Constinton as well. Construction is done and I'm doing my sanding and prep work now. I'll hopefully seal them tomorrow and maybe prime if there's time. Please post pictures of yours as you progress through the build as well.

 

[bobhowell]

I think I will just add blocks inside to cut the vol down to 14L and have a Micro Tower size box for one driver.