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Old 31st October 2003, 02:58 PM   #11
Rarkov is offline Rarkov  England
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How about this article in this month's AudioXpress (Nov 2003, Vol 34, Issue 11)...It talks about feedback from a DVC whilst using 1 voice coil for driving the sub and the other as a feedback sensor. I have to say that the extensive measurements in the article are really quite impressive and I am thinking about all sorts of variations! I'm looking for nice 6.5"-8" DVC to partner with an Adire DPL12 and Visaton MHT12. Maybe a HiVi D8.8+ would do the job...

Anyway, bass response was down to 20Hz (perfectly flat response) using a peerless 8" DVC!!!

Also, the circuit accounts for under/over sized boxes. Basically, it takes out the "precise" from speaker building.

Can't wait to start mine!

Gaz
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Old 31st October 2003, 03:15 PM   #12
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But it does nothing about the maximum ammount of air you can move
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Old 31st October 2003, 03:31 PM   #13
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Quote:
Originally posted by Rarkov
How about this article in this month's AudioXpress (Nov 2003, Vol 34, Issue 11)...It talks about feedback from a DVC whilst using 1 voice coil for driving the sub and the other as a feedback sensor. I have to say that the extensive measurements in the article are really quite impressive and I am thinking about all sorts of variations! I'm looking for nice 6.5"-8" DVC to partner with an Adire DPL12 and Visaton MHT12. Maybe a HiVi D8.8+ would do the job...

Anyway, bass response was down to 20Hz (perfectly flat response) using a peerless 8" DVC!!!

Also, the circuit accounts for under/over sized boxes. Basically, it takes out the "precise" from speaker building.

Can't wait to start mine!

Gaz

do you have a scanner/digital camera? if so, couyld you scan/take pictures of the article and send them to me at matttcattt@yahoo.co.uk ? thank you very much
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Old 31st October 2003, 07:29 PM   #14
Mark Kravchenko
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Default Time to wipe the drool off with your sleave and come back down to earth

All this banter about flat to DC (only slight exageration) Let's look at the possibilities. Ripping off a formula to calculate spl here we go....

SPL=-86+40logf+40logD+20logApp

f= frequency in hz
D= diameter in millimeters (25.4 mm/inch)
App= peak to peak excursion in millimeters

This will tell you how loud you can possible go.
Now for the bad news.
Ever hear about fletcher and munson????

These duudes figured out roughly how loud something has to be so that we can hear it.
20hz = 90db at our hearing threshold.
16hz = 100 agian loud enough to hear it.

Do the math and use real x-max #'s and see what you really get.

There are ways to get more for less ie. horn loading. But in my experience you get only 10db and that is above the cutoff frequency of your horn.

Food for thought in LARGE bites.

Mark
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Old 31st October 2003, 08:38 PM   #15
JoeBob is offline JoeBob  Canada
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Rarkov, if you do go about scanning the article, if you don't mind could you send a copy my way? JoeBob@(nospam)videotron.ca

I've got a DVC motion feedback setup going and it indeed sounds great, I'm running a 12" woofer in an open baffle with EQ and the motion feedback, sounds exceptional for a rather cheap driver...
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Old 31st October 2003, 10:39 PM   #16
cowanrg is offline cowanrg  United States
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sure, let me get some pictures. i have a digital, but its crap, so you might have to use your imagination. its a very modest system, but it sounds good. my weakest link is definately my amplification/preamp. im using a yamaha receiver right now (which surprisingly works well), but it will be replaced with a rotel or B&K pre/pro, and the alephs in my icon. all in due time, im just a poor college student!

here is the system rundown:

sources:

kenwood sirius satellite radio
NEC SCSI cd transport
Denon DVD-2200 dvd/dvda/sacd/cd

amplification/processing:

yamaha rx-v1300 (110x6)
3-channel gainclone (still in progress)
fosgate audionics M60 (60w monoblock for transducers)

speakers:

fronts: magnepan 1.6QR
rears: psb image 4T (soon to be maggie MG12's)
center: psb image 8c
4x bass transducers in floor boards
definitive technology supercube reference

cables:

synergistic research mark II speaker cable (fronts)
audioquest cv4 (rears and center)
synergistic research audio 2000 interconnects for SACD/DVDA
audioquest YIQ-1 component cable
audioquest VSD-1 composite cables
virtual dynamics basic power cord
signal power power cable
tara labs space and time bi-wire (fronts)
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Old 31st October 2003, 11:03 PM   #17
cowanrg is offline cowanrg  United States
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this is a view from the second floor looking down.
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Old 31st October 2003, 11:04 PM   #18
cowanrg is offline cowanrg  United States
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the left side of the system. the front speaker and the sub.
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Old 31st October 2003, 11:06 PM   #19
cowanrg is offline cowanrg  United States
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the sub stripped down. it had the active in front, and the radiators on the sides. its not that dirty in reality, and the cloth is black, not purple like it shows.
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Old 31st October 2003, 11:07 PM   #20
cowanrg is offline cowanrg  United States
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last one. this is of my right speaker, the thing on the ground is a cd to give you a scale of size. guess which cd and win a prize!
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