Dahlquist WFR-06VB04B, why change from 7mm to 5mm xmax?

[mintos]

I noticed that the Dahlquist WFR-06VB04B specs changed from 7mm to 5mm. Why the change? Where are the specs coming from?

http://www.parts-express.com/pe/psho...99-064&scqty=4

I was thinking to buy 4 for a TMWW... but can't be sure now as there's still no specs.

[johnnyrichards]

Well, sure glad I bought SIX of them based on the specs that were originally posted. I wonder if I can get 20% of my money back, based on 20% lower output capabilities?

There goes several hours of modeling down the toilet... whoosh.

I think PE should provide FR data for these, maybe I can use them in some other application rather than a slim tower sub - since even 3 of them at 5mm Xmax isn't going to do what I wanted.

Oh well, caveat emptor, as the saying goes.

[james_e5]

Well crap! I bought one to use as a computer sub. Well I guess I'll build it and see what happens. I can always swap with another driver later. It does kind of suck to find that out now though. At least I didn't buy six!

j

[johnnyrichards]

In all seriousness, what is the procedure to contact PE so I can speak with someone about this?

[Mayhem13]

Just remember, xmax isn't xlim. It takes 150w input power to drive three of these in 45L to 6mm......Presuming you won't be running them that loud with sine waves i think you'll be fine.

[christianb]

Well, sure glad I bought SIX of them based on the specs that were originally posted. I wonder if I can get 20% of my money back, based on 20% lower output capabilities?

You mean 28.57%.

[patrickm]

i agree. i picked up EIGHT of the blue 6.5" woofer and EIGHT of the subwoofers for a project for a friend of mine and emailed and posted asking for some measurements, but haven't gotten a response. and now the specs are changing? i'm tempted to send them all back. in retrospect, i'm kinda glad i was too late to pull the trigger on a couple of the 240W subwoofer amps yesterday, although those are good stuff, and i'm sure i would've found another use for those later.

[mintos]

Well.. if there are no specs that's one thing, but if PE is changing the stated specs then that means they know something... so why not share it.

[patrickm]

yeah, i just think from a business perspective taking one set of measurements would probably take less than a day, and help move a lot more product by saving customers some guesswork, so it's a bit frustrating. don't get me wrong -- i've been a customer here since the mid-1990s and still think PE is a great company. i've just noticed more and more variation in specs (catalog vs website vs datasheet) and less FR/Z data posted over the past couple years, and it's a little disappointing.

i realize it's the holidays and everyone's busy, i just figured they'd get to posting something eventually. and that's the chance i'm taking on the mid-woofers, that they'll be what i'm looking for, but as johnny pointed out, for subs you can do the first-level cut at the design from the T/S parameters (if they're accurate).

[gorbs]

so a measley 2mm of xmax turns these from a future sub project to what then ? would we be cranking these to the point where 2mm of movement would defeat the intended purchase and use anyway ?

i can't believe that three of these wouldn't or couldn't be built to outdo my old Bose sub from my 2.1 system i no longer use. someone please tell my noobness that it isn't so !!

[gorbs]

http://www.prontotech.com/product/da...-p_1356257190#

here they still are posted at 7.5mm xmax ?