Dayton DVC 8" reality check

[edlafontaine]

Greets!

I have built the Curvy Changs

http://www.diyaudio.com/forums/showthread.php?postid=1293897#post1293897

using the Pioneer B20FU20 wide range

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-045

This has increased my interest in a similar cabinet alignment for the Dayton DVC 8" to be used for low-bass duties. I will probably use two per cabinet.

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-480

So, on with the question!

How do the "real" parameters for the Dayton DVC 8" compare with those published? The value in designing a cabinet for these drivers depends upon getting the right numbers.

TIA

[rtkelly]

Re: Dayton DVC 8" reality check

Just for a mental exercise, how would you cast those enclosures?

Rollie

[edlafontaine]

Re: Dayton DVC 8" reality check

Hi Rollie,

These enclosures for the Dayton DVC 8 would be made from plywood or other sheet goods.

I'm still interested in your thoughts for the use of your diyLex door prize.

[rtkelly]

Re: Dayton DVC 8" reality check

Happy Thanksgiving Ed!!!!!,

I have concluded the 18's are physically too large for porch use. However, being the overly frugal person I am, I am considering Buying at least one more and putting them as IB drivers in my shop. Any opinions?

[benchtester]

Re: Dayton DVC 8" reality check

I am starting a Dayton DVC 8" project. The PE catalog specs. don't match the Dayton PDF. Other people have contacted PE and got the advice to use the Dayton PDF. Is there any third party measurements?

[edlafontaine]

Re: Dayton DVC 8" reality check

benchtester said:

...any third party measurements?

Exactly...I'm searching for an increase in confidence to begin simulations.

Rollie,

As big as that thing is, I think I'd try it alone to decide if more is needed.

[Max_Andrews]

Re: Dayton DVC 8" reality check

I'm using a pair of them in 2.2CF vented tuned to 30hz and they work well! Haven't measured them though...

[rtkelly]

Re: Dayton DVC 8" reality check

Ed,

You may be right that only one driver will be sufficient. However, I will be trying to fill >15000 cuft with sound over and above all of the ambient noise.

[Chris Roemer]

Re: Dayton DVC 8" reality check

I am starting a Dayton DVC 8" project. The PE catalog specs. don't match the Dayton PDF. Other people have contacted PE and got the advice to use the Dayton PDF. Is there any third party measurements?

This is the 3rd time I've voiced my opinion on this, but it's MY opinion that Dayton's NEW PDF specsheets aren't worth a poop. Sometimes they match PE's old data fairly well, and sometimes they don't. Several of the NEW Dayton sheets have GROSS errors in Vas. They changed their units from cu. ft. to metric (liters) in the specs, but NEVER recalculated the volumes. So you'll see an old driver that used to be 3.5 cf, NOW (Dayton says) it's 3.5 liters!

I built a project with the 8" DVC THIS past year, and there's NO WAY that it would sound as good as it does if the new Dayton specs were correct. I used PE's OLD datasheet, which matches Darren's old CLIO data, which matches the 2008 catalog data. I just hope the new 2009 catalog doesn't utilize all the new (incorrect IMO) Dayton data.

Chris

[edlafontaine]

Re: Dayton DVC 8" reality check

Chris,

You provide another confirmation of the situation. The 2009 catalog spec's match those on the "Description" page for the SD215-88. The spec's provided on the "Specifications" page are different by 6% or more. I expect there to be some variations, unit to unit. :rolleyes: What is published should represent the average.

I'll place a call to tech support today.

[rone]

Re: Dayton DVC 8" reality check

Why not just buy them and measure them?

Otherwise, IMO, one DVC12 would do about the same as 4 of those.

[robert]

Re: Dayton DVC 8" reality check

Ed: I'll break in the DVC-8 I have and measure this evening; it may help or at least give you an average value to start with.

Cheers / Robert

[edlafontaine]

Re: Dayton DVC 8" reality check

rone,

Measurement is the best way to go. I recently had the opportunity to purchase a new WT3. I'm kicking myself now for not doing so.

Tech support has just told me that 10% is acceptable. The point remains that PE should not provide information for their drivers in 2 or more locations that is different. Which set of data does the 10% apply to?

To their credit, the support person pulled a driver from stock and ran it through WT. The results he provided were: Fs=30 hz; Qts=0.42; Vas=1.5 cf. These fall "within range" of the sets of data provided.

I'm happy with the response from Tech Support. He gave a prompt response with the information I asked for.

I did ask Tech Support why there would be 2 sets of numbers. He was unable to answer. I hope by pointing this out to PE that some appropriate attention is brought to clear this up.

[Brent_S]

Re: Dayton DVC 8" reality check

I didn't measure the driver, but did use the updated PDF spec sheet, letting WinISD auto calculate values based on published Mms, Cms, Sd, Bl, Re, and QMS. The current shipping driver (as of September anyway) is cosmetically different than the 2008 catalog/web site picture. The shielding cup is now black instead of that gold/champagne color. Not sure if that means anything else changed in the driver or not.

The attached nearfield measurements...1/4-1/2" off the dust cap and right in the port mouth match or exceed my expectations based on the WinISD Pro model. This was on the out of box driver, no break in applied. Raw cabinet is 1.17 gross internal before subtracing driver/port (no additinal bracing). WinISD puts the raw tuning at 33Hz, but I added enough stuffing to lower measured tuning to 29.7Hz, effectively increasing the internal volume to around 1.5 ft^3. Amp is an SA240 (no boost) with the coils wired in series, so there is probably a bit of lift coming from the rumble filter on the bottom, according to WinISD.

-Brent

[Brent_S]

Re: Dayton DVC 8" reality check

Sidebar, my apologies, Ed:

This thread makes several times now I've seen reference to the 2009 Catalog on Tech-Talk. I also just noticed the "see catalog page" on the SD215-88 page appears to go to a PDF from the 2009 catalog. Has the 2009 catalog actually started shipping? A 2008 catalog was still included with my Sept/Oct shipments.

Thanks.

-Brent