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In the Forum: Audio Discussions
In the Thread: The loudspeakers for a powerful SET
Post Subject: OK, but hold yer horses...Posted by Gregm on: 4/18/2008
...we'll have to compromise somewhere. So, since it isn't the spkr's range, then it must be the amplifier.
Forget the ML's 18W. We must have ~38-40, so let's say our machine is using a 45 / 211 / 610 /g70 type of tube.
Also I don't suggest we conclude with the Baszilla type of bass/upper bass section which is one 15" in a box -- difficult to make this work even with ~35W. Lets get some

It's not that you need anything special to get 96dB from 4 dual paralleled woofs. That achievable. It's that by the time you provide the current they need to operate you're running out of "gas" for the rest of the spkr, in particular, the midrange.

 Paul wrote:
Re-thinking the DEBZ-ish design again, I think the un-Zobeled Lowther DX4 is about 99.5 dB.  IF Budification obviates the need for notch filters, as some insist, then paralleled/series 100 dB woofers might set up circa 99 dB in a "Super DEBZ++", and this MIGHT be OK with the same 97 dB Audaphon JP2 ribbon on top that my present DEBZ+s use.  This might actually work to get the thing closer to the very elusive SET/FR goal.
Seriously, I've been thinking along these lines too, but:
  1. I wouldn't play the Lowther unzobeled preferring to tame the low freq unit instead, and if necessary which it probably isn't. (I.e. in my previous playing around, it wasn't really necessary, I had just screwed up something somewhere.)
  2. I would like to break yr Lowther's range into two -- adding a lower mid unit in-between Lowther & bass.
  3. But I know that breaking this up means using up even more power...
Basically I'm worried about a Lowther playing down to 150 and, if I cut the L higher, I'm worried about the woof trying to play up to say 200.
I'll try this W-E to play a EX-4 down to 150 & up to 200, coupled to a Beyma 15". See what happens. I'll probably have to bi-amp because asaik the only set available is a 300b. Regards

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