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[leon douven]

Hi Antone,
looks verry good...
3600watts, Crown I-tech series... no prob.
regards
L.

[Mark "Bass Pig" Weiss]

I did say they were Kevlar-impregnated fiberglass, not Kevlar alone--huge difference. My EVX180Bs have Kevlar cones are are pretty rigid, but the Bassmaxx cones are like the hull of a boat in terms of stiffness. I can't stress enough, the point that it's the cleanest driver I've ever tested. Its THD performance is more akin to high end amplifier ratings than woofer ratings.

I know that the paper cone version of CGN's 1808 goes for $695. But that's not a Bassmaxx ZR18. I'm sure the Bassmaxx are a bit more, due to the Kevlar-impregnated fiberglass cones and custom suspension components. Also, the motor is a bit different, with a longer pole piece. Since I bought mine as demo models (prototypes, actually), I don't know what the same configuration would cost as new.

I too considered the Tumult, but was offput by the low efficiency, same as with the Acoupower driver. Although the latter LOOKS impressive, with it's huge heatsink around the magnet assembly.

To my knowlege, the Bassmaxx SPL sensitivity rating is in the bass range. It's sensitivity at 30Hz and below is higher than any other driver that I have auditioned. And the only driver I've tested that's totally free of audible THD. As a result, the room makes more audible noise than the driver, when the test frequency is below 20Hz.

Resonant Technologies makes a driver with a 54mm Xmax, but the sensitivity is so low that you'd need 6,000W of power into it to get what I get with 1500 into the Bassmaxx driver. And my cabinets were not designed expressly for the Bassmaxx. They were designed around a pair of Altec 3184s in 1982. I'm currently drafting a design for a much more suitable cabinet, with a port area that is equal to the sum of all the cones' area, for increased room coupling of port output. I'm going to be building a scaled-down convertable prototype with 6" drivers for testing the old and new designs via realworld response measurements.

It should be interesting to see what sort of gains can be achieved with a vent over 700 sq in over a long enough path to achieve the same tuning I get with a 96 sq in vent of shorter length.

[Antone Atmarama Bajor]

If you have the TS params of the CGN I'd love to model it.

    I so far seem to remember the Adire Tumult 18 Having the Best looking predicted Response down to ~16Hz in a vented Box.  But!!! That box needs to be at least 20cu'

    It looked even better to me than the graph of the, Acoupower even though I can't speak for the linearity VS xmax statement that Acoupower makes Vs any other driver.

    Acoupower claims Totally linear BL up to 18mm excursion but it has a 40something mm Xmax!?

Antone-

   

[Mark "Bass Pig" Weiss]

The numbers from both manufacturers are somewhat confusing, in that there is "totally linear" and "Xmax" and seem to be treated as two different things.

CGN has their T/S parameters on their web site, but I have not gotten the T/S parameters on the Bassmaxx drivers. That's one thing I have to bother David Lee about in the coming months, as the project draws near.

My rough estimates call for a box that's about 34 cu ft, including a massive vent. Woofers will be in a slightly smaller enclosure within that big box.

This rendering is my concept of the box.

[Tim Padrick]

There's also the Worx Audio driver: http://www.worxaudio.com/product_desc_true.php?id=56

[Antone Atmarama Bajor]

No TS parameters, no price!?

    Could have an 24"  Xmax for all I care, I can't model it, its of no use, except that the basket is shiny and read.  I do like a nice red speaker basket.

Antone-

[Tim Duffin]

If you are bored- could you model 4 JL audio 12w3v2 drivers against the 4 lab drivers?  I know for a fact they have more xmax and power handling, but don't know what they would model.


T

[Antone Atmarama Bajor]

     I'm going by what Bass box has for TS parameters (I had to calculate many of them).

    It claims a slightly shorter XMAX 11mm instead of 13mm for the Lab.

    The Power handling is 150watts per coil so 300watts, 100Less than the Labs.  I went with the 4ohm coil version though I could have done the 6 Ohm I suppose.

Here are the results:

JL audio red, Eminence Orange



    Close but a slightly larger cabinet for a little less output.  Though the Lab cab is slightly lower impendance.  But this is comparing watt for watt, so it should be fairly accurate.

    HT Bass box normally has accurate default TS parameters.  But perhaps there was an error you can see what was used.  Whats the cost per driver??

Antone-

[Mark "Bass Pig" Weiss]

Antone Atmarama Bajor wrote on Fri, 12 January 2007 00:43

No TS parameters, no price!?     Could have an 24"  Xmax for all I care, I can't model it, its of no use, except that the basket is shiny and read.  I do like a nice red speaker basket. Antone-

I'm in the process of trying to track down that information, as I'll be needing it this spring when I built the new cabinets. I'm not sure if the price is available, unless David is willing to sell the raw drivers. I got my four because he was in the process of moving to another cycle of drivers for testing. Definately a fortuitous opportunity, but as such, perhaps not easily repeatable?

[Peter Wing]

Here is a driver that you could get great cost effectivness from..
This driver has been widely accepted as a great quality item by the DIY audio community.. despite the insane price.

http://www.mach5audio.com/product_info.php?cPath=48&prod ucts_id=38&osCsid=e8481273ddba91880943fd3473852bc0

This driver looks like it has been manufactured by Tc sounds--a well known speaker manufacturer.
http://www.tcsounds.com/