What to do with Hemp CO8Vs?

spacies · 1st September 2008, 06:35 AM

Hi all,
1st post here.

I have been offered a pair of NIB Hemp CO8Vs. I thought they were able to be used without a crossover but they aren't. I am still interested in trying these out though.

I do have a CNC machine so cabinet building is not a problem. I was thinking about a Transmission Line (similar to these) cab using Trans-Laminated ply. Cabinet volume of approx 25-30lts.

Would this be the correct choice for these drivers?

Many thanks.

e_fortier · 1st September 2008, 11:25 PM

Hi Spacies,

Welcome to the club

Without knowing more info about the driver (parameters like fs, Qts, Qes,Vas, etc. and a plan for the transmission line it hard to tell.

Regards,
Eric

GM · 2nd September 2008, 01:20 AM

http://www.hempacoustics.com/products.php
http://www.hempacoustics.com/CO8V_-_...heet_ready.pdf

25-30 L implies a ~T/S max flat vented or old tech TL alignment which for the latter equates to anemic bass and excessive loss of efficiency due to baffle step compensation (BSC) if either not corner loaded and/or a high Q driver and/or a 'sub' is used. Plus, due to a relatively high Fs, low Vas, then if tuned to fill in the mid-bass there's no bass of consequence, so another type of cab design may be desirable.

GM

spacies · 2nd September 2008, 02:35 AM

Thanks,

The specs are here:
http://www.hempacoustics.com/CO8V_-_...heet_ready.pdf

I can do the cabinets easily enough but when it comes to specs, I need to study more.

spacies · 2nd September 2008, 02:35 AM

Thanks GM.

As posted above (once moderator clears) the cabinet type isn't a problem. I would like some advice on the cabinet style best suited for them.

Cabinet type, volume etc.
I am very excited about starting to use full range drivers having done a MTM. I would prefer no crossover but the Hemps just have an appeal and are waiting for some music to be played through them.

planet10 · 2nd September 2008, 03:54 AM

Quote:

Originally posted by spacies
I have been offered a pair of NIB Hemp CO8Vs. I thought they were able to be used without a crossover but they aren't. I am still interested in trying these out though.

A co-ax is a 2-way, needs an XO.

You can actually touch these drivers? Actually finding a pair of these drivers is a feat.

I wouldn't trust the factory specs BTW.

dave

spacies · 2nd September 2008, 11:39 AM

Just paid for these drivers.
So in a couple of days I will be able to touch them.

The price was too good to turn down.

spacies · 5th September 2008, 04:25 AM

Well they just arrived.

So, who has a pair of these running? Any info to share?

Thanks.

Brett · 5th September 2008, 06:20 AM

Pics and an assessment of build quality would be nice. Measurements would be even better.

bambadoo · 5th September 2008, 06:35 AM

I have a pair of co15v laying araound.
Not sure what to do with those either

1st September 2008, 06:35 AM	#1
spacies diyAudio Member Join Date: Aug 2008	What to do with Hemp CO8Vs? Hi all, 1st post here. I have been offered a pair of NIB Hemp CO8Vs. I thought they were able to be used without a crossover but they aren't. I am still interested in trying these out though. I do have a CNC machine so cabinet building is not a problem. I was thinking about a Transmission Line (similar to these) cab using Trans-Laminated ply. Cabinet volume of approx 25-30lts. Would this be the correct choice for these drivers? Many thanks.

2nd September 2008, 01:20 AM	#3
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	http://www.hempacoustics.com/products.php http://www.hempacoustics.com/CO8V_-_...heet_ready.pdf 25-30 L implies a ~T/S max flat vented or old tech TL alignment which for the latter equates to anemic bass and excessive loss of efficiency due to baffle step compensation (BSC) if either not corner loaded and/or a high Q driver and/or a 'sub' is used. Plus, due to a relatively high Fs, low Vas, then if tuned to fill in the mid-bass there's no bass of consequence, so another type of cab design may be desirable. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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1st September 2008, 11:25 PM	#2
e_fortier diyAudio Member Join Date: May 2001 Location: Montreal	Hi Spacies, Welcome to the club Without knowing more info about the driver (parameters like fs, Qts, Qes,Vas, etc. and a plan for the transmission line it hard to tell. Regards, Eric

2nd September 2008, 02:35 AM	#4
spacies diyAudio Member Join Date: Aug 2008	Thanks, The specs are here: http://www.hempacoustics.com/CO8V_-_...heet_ready.pdf I can do the cabinets easily enough but when it comes to specs, I need to study more.

2nd September 2008, 11:39 AM	#7
spacies diyAudio Member Join Date: Aug 2008	Just paid for these drivers. So in a couple of days I will be able to touch them. The price was too good to turn down.

5th September 2008, 04:25 AM	#8
spacies diyAudio Member Join Date: Aug 2008	Well they just arrived. So, who has a pair of these running? Any info to share? Thanks.

5th September 2008, 06:20 AM	#9
Brett diyAudio Member Join Date: Jan 2002	Pics and an assessment of build quality would be nice. Measurements would be even better.

5th September 2008, 06:35 AM	#10
bambadoo diyAudio Member Join Date: Feb 2003 Location: West Coast of Norway	I have a pair of co15v laying araound. Not sure what to do with those either

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