My New PA Setup w/ ServODrive

[FairfaxStu]

Folks:

I know that most everybody here posts with their problems so I wanted to take this opportunity to share with you my success story which has been a long time in the making.

Back in 2005, I purchased a BassTech 7 module from Europe. It was in good condition and at a good price. I then spent the next several years (on and off) searching for the cabinet to put it in. Luckily, in May of this year, I was able to connect with the manufacturers and get a "new" old stock cabinet. After some slight mods to the cabinet to make the module fit properly, I was good to go.

I then picked up a Behringer PMP4000 Mixer and some Peavey PR12's. I coupled those up with a Rane AC23 crossover and Crown DC300A amplifier. After some tweaking the sound is excellent. It even rivals my main system consisting of Klipsch and JBL speakers with Adcom and Crown power.

I have not yet had the opportunity to take it outdoors but I suspect the results will be good. That ServODrive is a monster with 600 watts on it.

-Stu

[bear]

pix?

[FairfaxStu]

I tried and hope this works. See attached pics.

[tomi]

That DC300 is a bit of a classic!
I'm not familiar with the sub though - does the name ServODrive imply that it's servo-controled? It's an interesting idea and I'm sure q few of us would be interested in hearing about it if so.

[FairfaxStu]

Originally Posted by tomi

I'm not familiar with the sub though - does the name ServODrive imply that it's servo-controled? It's an interesting idea and I'm sure q few of us would be interested in hearing about it if so.

Actually, the ServODrive is not servo controlled, but rather is driven by a servo motor instead of conventional voicecoils and magnets. I have attached a pic of the Basstech 7 module. The blue thing in the back is the servo motor.

[tomi]

Thanks, most intriguing!

[Harleyjon]

That ServoDrive unit is a classic as well as the Crown Amp. (I repaired a DC300A yesterday!)
They were used in cinema situations for Sub Bass applications using a pair of 18" steel cones, horizontally opposed and built into a hardwood or ceramic cabinet.
A bit of a pain to set up the null point on some models but useful up to 120Hz.

[JMFahey]

Wow, that's weird !!
Does it reproduce anything above, say, 1 Hz?
And only half joking here.
Mass and rotational inertia must be murderous.

[FairfaxStu]

Originally Posted by JMFahey

Wow, that's weird !!
Does it reproduce anything above, say, 1 Hz?
And only half joking here.
Mass and rotational inertia must be murderous.

Here are the specs:
http://phy6.net/downloads/electronic.../Basstech7.pdf

I currently have the Rane crossoving it over at 80Hz and it sounds amazing!

[JMFahey]

Very interesting, I'm tempted to cook my own, just to see (hear) what happens.
Upper frequency limit looks too good to be true, but experimenting is king.
Thanks for the idea