Hemp FR8C in Wide and Thin (Mileva?)

fcj · 25th April 2007, 01:00 AM

Hello,
Just build the Aperto (21 liters, tuned at 56hz) for the FR8c, and it´s sounding very good, with real bass, but a little bright on some records (around 20 hours of burn in).

So, I have a second pair of fr8c, and planning to build a beatiful,
tall(120cm)
wide(40cm)
thin(20cm)

enclosure for them, maybe simple BR, or a mltl or even better a Mileva or mini mileva?
I entered those dimensions on bassbox and get -3db at 50, tuned at 42

Any sugestions?

Really like the Mileva concept

Thank´s

Scottmoose · 25th April 2007, 07:32 AM

It'd be possible to do one, but you'd have to watch the vent aspect ratio.

planet10 · 25th April 2007, 08:17 AM

Quote:

Originally posted by fcj
the FR8c.... or even better a Mileva or mini mileva?....
Really like the Mileva concept

Demetri is the FE167/FE207/FR8 version of the Mileva.... if you would like the 1st draft plans mail me (we are adding a bit of depth and reducing the width to get a more aesthetically pleasing shap.... we will be building one set each for FE167 & FE207.

dave

PS: Scott was being coy... he modeled the verification for the design.

pjanda1 · 25th April 2007, 04:08 PM

Don't judge too much until they've had more burn in. I'd pull 'em out of the cabs and put the drivers face to face and out of phase, then play low frequency sine wave sweeps through them at around their xmax for a day or two. Are you running any baffle step compensation? You'll probably also want some bsc in any BR. It'll change to tonal balance considerably.

pj

fcj · 25th April 2007, 04:39 PM

Thank´s for the replys:

Quote:

if you would like the 1st draft plans mail me

I sended you a mail

Quote:

baffle step compensation?

Not for the moment, what do you suggest as a start poit?

Quote:

play low frequency sine wave sweeps

At what frequency?

Scottmoose · 25th April 2007, 04:57 PM

Not entirely coy Dave. The ML MathCad sheets are only set up for circular vents. They'll model a slot-port OK, but if the aspect ratio of the vent exceeds 9:1 (IIRC) then their accuracy drops away a bit. That's why I want to do some more work on Demetri in the Sections sheet, to refine it a little.

planet10 · 22nd May 2007, 10:17 PM

Quote:

Originally posted by planet10
Demetri is the FE167/FE207/FR8 version of the Mileva....

1st "official" release of Demetri plans....

http://www.planet10-hifi.com/boxes-fostex.html#demetri

dave

25th April 2007, 01:00 AM	#1
fcj diyAudio Member Join Date: Nov 2005 Location: stgo, chile	Hemp FR8C in Wide and Thin (Mileva?) Hello, Just build the Aperto (21 liters, tuned at 56hz) for the FR8c, and it´s sounding very good, with real bass, but a little bright on some records (around 20 hours of burn in). So, I have a second pair of fr8c, and planning to build a beatiful, tall(120cm) wide(40cm) thin(20cm) enclosure for them, maybe simple BR, or a mltl or even better a Mileva or mini mileva? I entered those dimensions on bassbox and get -3db at 50, tuned at 42 Any sugestions? Really like the Mileva concept Thank´s

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25th April 2007, 07:32 AM	#2
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	It'd be possible to do one, but you'd have to watch the vent aspect ratio.

25th April 2007, 04:08 PM	#4
pjanda1 diyAudio Member Join Date: Jan 2005 Location: The Nebraska Panhandle	Don't judge too much until they've had more burn in. I'd pull 'em out of the cabs and put the drivers face to face and out of phase, then play low frequency sine wave sweeps through them at around their xmax for a day or two. Are you running any baffle step compensation? You'll probably also want some bsc in any BR. It'll change to tonal balance considerably. pj

25th April 2007, 04:57 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Not entirely coy Dave. The ML MathCad sheets are only set up for circular vents. They'll model a slot-port OK, but if the aspect ratio of the vent exceeds 9:1 (IIRC) then their accuracy drops away a bit. That's why I want to do some more work on Demetri in the Sections sheet, to refine it a little.

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