Aurum Cantus AC200/50C2C 8" Woofer

[lduarte1973]

Anyone used this woofers ?

Aurum Cantus AC200/50C2C 8" Woofer 296-452

 

[SpinMonster]

Bringing this back from the dead. I'm interested in using 4 of these in a TMM with a waveguide at 1400hz 4th order.

Any opinions?

Zaph says the peak in the distortion tests @3.7K isnt distortion but rather a measurement artifact.

 

[Jay1111]

I would be worried about the 3rd hd peaking between 1200-1300 hz. I would try to cross at least 1200 hz or below.

 

[SpinMonster]

@ -57db?

 

[Jay1111]

It's tied to the cone's breakup

 

[SpinMonster]

Where is the break-up?

 

[SpinMonster]

3rd order HD at 1200 would be triggered by something at 400hz wouldnt it? I see nothing there.

 

[MisterTwister]

on manufacturer's supplied curve there is a tiny wiggle around 900hz, that's where resonance is starting. If high fidelity sound is desired, I wouldn't use this woofer anywhere above 600-800 hz

 

[Richard Ellis]

Regarding the 900Hz "wiggle"...I recall an extended discussion of woofer basket assemblies "ringing", it was the 12LTA FR driver. The discussion went well into damping out basket resonances....& the frequency of 900 Hz triggered something in my head.....looked up the driver & sure enough it is one of those cast Aluminum baskets......I'm of the opinion those cast Aluminum jobs ring like a tuning fork, as opposed to plain steel which have a broader Fr range.
just some thoughts that cropped up on my end.........

_____________________________________________________Rick........

 

[SpinMonster]

OK. I'm just wondering why Zaph says its good for use with a robust tweeter in a 2 way.

 

[ScottG]

I wouldn't worry at all about Non-linear performance for this driver below 1.5kHz:

http://www.zaphaudio.com/temp/AurumCantus-AC200-50C2C-HD.gif

Note the "dip" in even-order harmonics with a "bump" in odd-order is a result of the surround and it can be seen in the Impedance:

http://www.zaphaudio.com/temp/AurumCantus-AC200-50C2C-IMP-2.gif

Still, it's so low in level that it's a non-issue.


Linear decay however isn't exactly great.

 

[Jay1111]

The 3600 hz cone break up equals a 1200 hz 3rd order peak and a 720 hz 5th order peak, just as the HD graph shows.

I would treat it the same as a metal cone driver.

 

[SpinMonster]

The 3600 hz cone break up equals a 1200 hz 3rd order peak and a 720 hz 5th order peak, just as the HD graph shows.

I would treat it the same as a metal cone driver.

Again, Zaph noted that there is no distortion at 3700 and the graph is showing an overloaded mic measurement.

Zaph wrote on tech talk:

"There is no peak in distortion at 3.7 Khz, that is my mic preamp overloading. You see that on a few of the more sensitive tested drivers that have high level breakups. It's the price of consistency, I didn't want to tweak the levels and completely rearrange my system settings to avoid it."

 

[Jay1111]

I'm not talking about what is going on in the HD graph at the cones breakup....

 

[SpinMonster]

OK.

Thanks for posting. Its what I was looking for.

 

[Jay1111]

If you haven't already purchased those woofers, a much better choice for a 2 way would be this

The Madisound Speaker Store

 

[Face]

Seas's Nextel 8" has phenominal distortion (under 1%) to 6k IIRC.

 

[SpinMonster]

Seas's Nextel 8" has phenominal distortion (under 1%) to 6k IIRC.

I havent bought anything yet.

This one looks good, its pricey at $1100 for 4 of them but if it delivers, thats fine. So 1400hz looks good there. I am looking for a serious midbass punch.

Thanks for the suggestions.

 

[ScottG]

http://motusaudio.com/wp-content/uploads/2012/09/UH205PW1-Spec-Sheet-7-2012.pdf

 

[SpinMonster]

http://motusaudio.com/wp-content/uploads/2012/09/UH205PW1-Spec-Sheet-7-2012.pdf

Monster driver but not for a TMM as the load would be pretty harsh and its also a bit low in sensitivity. I prefer something like the 18sound 6ND for its easy load and 92db w/1watt. I'll just stay with a 7".