Fullrangedriver Forum

http://www.positive-feedback.com/Issue11/zudruid.htm

They definately got hype

that dip didn't appear outdoors on my pipe on speaker-axis (unless the pipe's exit was blocked) - ground plane has a rise around 150
http://www.diyaudio.com/forums/full-ran … ost2111302

Last edited by karlsonkab (2010-03-12 11:05:23)

P.S.  I would much like to hear the Druids.  I have two clients on them, and both say that they are, um, a little idiosyncratic, but outrageous.

P

>From a hypethrower who lists  "Custom made wooden cable raisers"
>amongst his standard listening equipment.

Are you telling me you don't use those ?
What do you do ? Let your wires lie on the floor ?
What a minimilist

>>> The impact of accelerated electrons below 88.223 Hz can, over time, change the crystalline structure of the screws holding the driver, thus causing jitter.

LOL!

I also like the idea of a Druid clone or something better using the Eminence 10" driver w/wizzer. Rated only out to 4k tho...

You guys hijacked my thread!!!! However I will forgive you because of the humorous nature of the hijacking. I have found that my speakers sound their absolute optimum best when my speaker wires are entwined with a bunch of dust bunnies on the floor behind the speakers and all the way to the amplifier. Every time I go after the dust bunnies with the vacuum cleaner the sound quality of my speakers change. I has to be the dust bunnies. It couldn't be because of the shreeking whine of the vacuum fouling the air in my listening room and burning a hole in my hearing!!! Ok, now back to the B102 questions. Does anyone know why the druid can claim 101db at 1 watt efficiency when the B102 is only around 94db or so. Does removing the dust cap increase the SPL value or are they assembling the Druid driver with tighter tolerances on the gap which seems to me the only way to increase the spl number. The 12 Ohms impedance shouldn't make any difference as long as they adjust the amp output for 1 watt at 12 Ohms. On the B102 spec sheet in the notes section is says to ask about different impedences. Would any other impedance improove the Spl number. Any thoughts?
Ron Brady

Freddy
Thanks for the link. It looks like Zu's 101db spec is a bit optemistic. But even at 95 or so it is still more than the published specs for the B102 of 93db. I wonder if eminence is a little conservative with their specs. I recall seeing older specs for the B102 which gave it a better spl number around 98db. I suppose that it really doesnt matter anyway because I lost the chance to buy the Druids but it has created an interest in possibly cloning them. The audio nirvana AN10 has a good looking curve and sensitivity and it has a bigger magnet so it might be a better candidate for a 10incher in a tower design with a regular round port somewhere in the 2.5-3.5 cubic foot enclosure size........ Oh well.
Best wishes
Ron Brady

>But even at 95 or so it is still more than the published specs for the B102 of 93db.

Isn't some gain expected from a cabinet ?

at ~42Hz Fb, AN10 in my 70 liter reflex is tuned too low to have much impact.   My 1954 RJ with EV SP15 kills it on bass dynamics.   That said, I would expect David Dick's tuning to do better for impact and impact can improve as balance is restored with moving speakers closer to boundaries, eq on bottom, or BSC filter.   AN10 in my 15" Karlson with 30.5 sq. in. port has pretty good impact and the two rear chamber impedance peaks are close in amplitude height and no need for BSC. It probably would be a bit better with the original 40sq.in. vent.   

Earthworks has a drum demo cd for their microphones - its pretty useless for judging real music as only one drum or cymbal is struck at a time.  Real pop/jazz music grooves can get busy on drums and introduce a lot of modulation.    - - -anyhow, Earthworks' kickdrum on the reflex caused AN10 deflection of about 1/2" peak to peak - on the Karlson it was about 1/8" peak to peak.   Being back in the Karlson cavity plus the Karlson's rain from 60-~200, the Karlson has a darker presentation than the reflex.   Maybe a simple BSC filter on an AN10 reflex would be suitable for most listeners.  AN10 in reflex had a lively sound on Hammond organ midrange.

Since Druid looks very nice you might make some sort of MLTL with similar frontal aspect and an adjustable floor vent up on spikes.    You might ask GM or Scottmoose over at DIYAUDIO's fullrange forum to cook up a MLTL.  btw -  I bought a pair of 8" Tang band 1772 but not felt well enough to play with that driver other than run briefly in BK20 blh - it seemed nice.

The Karlson has more output with AN10 than the reflex and the Karlson also has much less cone excursion.  The high frequencies are pretty much the same in amplitude but the mic perspective in this graph had the mic below the 30 degree baffle tilt lobe.  Fb is probably higher on the K but at the same time I think a nearcone plot of the cone would show a null lower than on the reflex - if that makes sense. I suspect the 1952 spec 40sq. inch port in the Karlson might make the response at 200Hz a bit higher than this 30.5 sq.in. port. (?)

Last edited by karlsonkab (2010-03-16 14:26:30)

thanks for the good thoughts - opening windows isn't good in my neighborhood - there's two folks (likely contractors) who burn toxic stuff within a half-one block radius and the kid next door made a fire pit.....

Yeah, but "Where's the Bass ? "

A 1/4 wave of the 66hz Fs means this driver isn't going to deliver very much in the bass department.





.............................Blake

that was a nice sim - whether Zu had fs put higher than stock early B102 - we don't know - their 10 superfically looked like both stock B102 .   Only decent 10 woofer in my pile are 10G200 with 4.5mm overhang and 16.9 BL spec - fs might be a bit too low.  At any rate that Ciare should be a fun driver.

Last edited by karlsonkab (2010-03-29 13:21:24)