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CBT36 Array - Page 2

post #31 of 129
Still curious how many different drive signals the woofer and tweeter arrays get.
post #32 of 129
From the link in the original post:
Quote:


The system must be bi‐amped and requires a DSP‐based speaker EQ/processor along with two stereo power amplifiers. For extended bass response below 60Hz one or two powerful 60Hz, subwoofers are required. Note that the system can't be used without the EQ/processor.
post #33 of 129
Quote:
Originally Posted by coctostan View Post

Would using gradually thicker acoustic foam at the top and bottom of a flat or less curved array work to both delay and attenuate like the CBT model? It could eliminate the crossover complexity and make it easier to construct a small CBT. Something like 2ft tall.

Specifically, I'm thinking about something like what RAAL does with the foam on their ribbons which helps to reduce the beaming inherent to a tall ribbon.

This has been tried before, to attenuate line arrays....I can't remember who wrote the paper, but essentially a tapered attenuating material that was thickest at the ends of the array.....don't think it fared to well, but I can't remember the details...

Problems are getting a material that will attenuate the broadest freq spectrum equally. The thickness must also be adjusted for off-axis response, not easy to do in a multi-way setup, but possible.

JSS
post #34 of 129
Quote:
Originally Posted by maxmercy View Post

This has been tried before, to attenuate line arrays....I can't remember who wrote the paper, but essentially a tapered attenuating material that was thickest at the ends of the array.....don't think it fared to well, but I can't remember the details...

Problems are getting a material that will attenuate the broadest freq spectrum equally. The thickness must also be adjusted for off-axis response, not easy to do in a multi-way setup, but possible.

JSS

Ah yes, that makes sense. It seemed to good to be true. It was just one of those ideas that popped into my head.
post #35 of 129
Thread Starter 
Quote:
Originally Posted by noah katz View Post

Still curious how many different drive signals the woofer and tweeter arrays get.

The woofer line is pretty straightforward - not much adjustment needed. Depending on your subwoofer's crossover point you can add EQ to extend the array if desired. The tweeter section has more equalization to tame a low frequency peak and also flatten out the upper octave response (the latter due to the inherent rolloff of the CBT design).
post #36 of 129
The CBT36 kit just showed up on the PE facebook page as being available:

http://www.parts-express.com/pe/show...number=301-980

I'll let you click the link to find the cost. It's a bit out of my reach right now.
Really, really want them though.
post #37 of 129
Quote:
Originally Posted by CZ Eddie View Post

The CBT36 kit just showed up on the PE facebook page as being available:

http://www.parts-express.com/pe/show...number=301-980

I'll let you click the link to find the cost. It's a bit out of my reach right now.
Really, really want them though.

Dang! I nearly choked on my lunch I've been REALLY curious when these were going to show up and at what price but ...
post #38 of 129
This will be fun!
LL
LL
LL
post #39 of 129
Looks fun omholt, please keep us posted. Man those tweeters are tiny!!!
post #40 of 129
I'm assuming the cost is a lot less if you build the cabinet yourself?
post #41 of 129
Thread Starter 
Quote:
Originally Posted by CZ Eddie View Post

I'm assuming the cost is a lot less if you build the cabinet yourself?

The cabinets are part of the kit. I've seen the CNC cutting the panels.

Because of the tweeter module design it would be nearly impossible to build these with a traditional router. The cabinet tolerances are also very tight.
post #42 of 129
It will take some time before I've mine up and running. Delivered the front plates for lacquer finish today, but they were buisy and I have to wait. Planning to have a nice finer on the sides, as well as the baseplate. All glossy black would be fine, but I think a wooden finish looks better in the long run and I hope this speaker will go with me for a while. To finer the front isn't easy though, so I will go with piano black there. Similar to Usher speakers.



Perhaps Rick can answer this. I've wooden floor and have always good experience using rubber feet under the speakers for removing resonances. Would this be ok for the CBT36 as well or could this effect the shading?
post #43 of 129
For $2k, I would hope for something more elegant than a 90° bracket screwing the tower to the base. Otherwise I like it.
post #44 of 129
Thread Starter 
Quote:
Originally Posted by omholt View Post

It will take some time before I've mine up and running. Delivered the front plates for lacquer finish today, but they were buisy and I have to wait. Planning to have a nice finer on the sides, as well as the baseplate. All glossy black would be fine, but I think a wooden finish looks better in the long run and I hope this speaker will go with me for a while. To finer the front isn't easy though, so I will go with piano black there. Similar to Usher speakers.



Perhaps Rick can answer this. I've wooden floor and have always good experience using rubber feet under the speakers for removing resonances. Would this be ok for the CBT36 as well or could this effect the shading?

We've discussed this but not tried to measure the speaker like that.
post #45 of 129
Quote:
Originally Posted by Looneybomber View Post

For $2k, I would hope for something more elegant than a 90° bracket screwing the tower to the base. Otherwise I like it.

That was honestly my first thought when I saw them in the catalog.
post #46 of 129
Processor - MiniDSP?

Why are there so few subjective comments on the web? I'm sure there must be at least 20 or 30 people who have listened critically to these. But I can't find anyone talking about how good/bad/other they sound. Rick gave a one sentence review. Is there no more?

Thanks,
--Myles
post #47 of 129
Thread Starter 
Quote:
Originally Posted by smprather View Post

Processor - MiniDSP?

Why are there so few subjective comments on the web? I'm sure there must be at least 20 or 30 people who have listened critically to these. But I can't find anyone talking about how good/bad/other they sound. Rick gave a one sentence review. Is there no more?

Thanks,
--Myles

I've not used the MiniDSP but from what I've read it should work fine with the CBT. The design is fairly new and except for the 2011 RMAF show not many have listened to it. I'll have a CBT at the AK Fest later this month.
post #48 of 129
Finally something is happening. Took a long time to get the fronts lacquered.
LL
LL
LL
post #49 of 129
Thread Starter 
If you're going to the Newport Beach show in June you can hear some CBT arrays...
post #50 of 129
Thread Starter 
Quote:
Originally Posted by omholt View Post

Finally something is happening. Took a long time to get the fronts lacquered.

Looking good - how is the assembly coming along?
post #51 of 129
Quote:
Originally Posted by Rick Craig View Post

Looking good - how is the assembly coming along?

Not gotten there yet. I've a carpenter/speaker builder to do the job for me and he's occupied at the moment. Seems like we'll start the 22nd.

I have high hopes for the CBT36. I already have a pair of Geddes Abbey which are great speakers. Will be interesting to compare these designs, but I'm expecting the CBTs to be better with a more uniform response and perhaps better dynamics. Just need to deal with early sidewall reflections a bit more then the Abbeys.

Not sure what bass solution I'll choose. Thinking about either two bass towers in a hybrid dipole configuration or multiple subwoofers spread out in the room. Open for ideas from an objective standpoint.
LL
post #52 of 129
Still following this thread...

Has any headway been made? You have these bad boys up and running yet?
post #53 of 129
My project is at standstill. I'm waiting for new resistors and some replacement midbasses. It takes time.

450450450
post #54 of 129
Quote:
Originally Posted by omholt View Post

My project is at standstill. I'm waiting for new resistors and some replacement midbasses. It takes time.
450450450

Looking excellent thus far. Thanks for the pictures.

Can't wait to hear your listening opinions...
post #55 of 129
Was something wrong with the ones (resistors/midbasses) you got?

JSS
post #56 of 129
Quote:
Originally Posted by maxmercy View Post

Was something wrong with the ones (resistors/midbasses) you got?
JSS
Some of the midbasses had scraping sounds when pressing the center. They check all the drivers before they send them out now. I received wrong type of resistors, which the three first persons who ordered did, but they have also changed to more powerful resistors now.
post #57 of 129
Quote:
Originally Posted by omholt View Post

Some of the midbasses had scraping sounds when pressing the center. They check all the drivers before they send them out now. I received wrong type of resistors, which the three first persons who ordered did, but they have also changed to more powerful resistors now.

Guess having SO many drivers and items within a single product, the QC would have to be extremely thorough to ensure every piece was non-defective.
post #58 of 129
Looking forward to your thoughts!

JSS
post #59 of 129
I've had the speakers up and running a few days. I need to work a bit on placement in this challenging room, I'll upgrade the crossover in near future and I'll get a better bass solution. So far though I'm really impressed by the CBT36. Very dynamic and powerful, very uniform and even frequency response and fun to listen to. Like I've mentioned at other forums, I feel in many ways now that I've reached the goal with speakers and that I can live with these for many years. My next great upgrade will be a better room. The CBT36 speakers will be hard to match no matter what the cost is. I also have a pair of Geddes Abbey speakers who are great and I will do a comparison later with measurements.

post #60 of 129
They look great, was it real time consuming to install all the drivers and wire up?
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