ScanSpeak 4" midrange (12M_4631G00) Distortion Tests

Tenson · 21st April 2007, 07:07 PM

Hi,

I have not seen these published so thought I should share them.

Zaph has some of the larger ScanSpeak revelator sliced paper cones but not this smaller 4" midrange.

I will leave it to the viewer to interpret the results.

It was referenced to 90dB/1m@1KHz. Two samples were tested and both were extremely similar so there is good matching between the drivers.

Jed · 21st April 2007, 07:59 PM

Zaph did tests of the 12M as well. Check again.

Tenson · 21st April 2007, 08:17 PM

Ahh yes so he has. It is a pretty new addition - 4th Feb 07. I had not looked since before then. Still it is nice to see his results match mine quite closely.

ShinOBIWAN · 21st April 2007, 09:30 PM

Thanks Simon, always nice to have a second or third set of distortion tests.

I very nearly used this midrange myself but its a poor performance overall considering the price. For comparison take a look at the ATC 3" dome mid tested at 90dB at 2m(93dB/1m):

Tenson · 21st April 2007, 09:41 PM

Yeah, the ATC has VERY impressive disto specs. Not bad CSD either. But it is more expensive isn't it? Also it simply isn't suitable for the project I have in store.

Tenson · 21st April 2007, 09:48 PM

I also took some measurements of the Hi-Vi RT1.3 isoplanar ribbon tweeter.

Click

This is a rather nice tweeter for use above 3.5KHz. It offers very low disto as you can see but it also means you have the choice of a ribbon-like dispersion pattern. Maybe good for a MTM layout? Consider that this tweeter costs about £15 each inc.VAT and we are really talking

Oh yes, the other reason I really like this tweeter is that it has a completely flat impedance. So it will work with text-book crossovers.

ShinOBIWAN · 21st April 2007, 09:50 PM

Quote:

Originally posted by Tenson
Yeah, the ATC has VERY impressive disto specs. Not bad CSD either. But it is more expensive isn't it? Also it simply isn't suitable for the project I have in store.

The ATC is more expensive, by a factor of around 2.5.

The 12M lacks the copper in the motor of its bigger brothers which explains why its a departure from their good performance.

The SS and ATC both only look comfortable to 500hz. So I think their purpose and optimum passband are similar. The SS has more displacement but I think thats somewhat academic given the data.

454Casull · 21st April 2007, 11:55 PM

Doubling the distance decreases SPL by 6dB, does it not?

Tenson · 22nd April 2007, 01:22 AM

Only in true free field

tinitus · 22nd April 2007, 01:55 AM

Shin, how can you say that 12M lacks the copper short rings

Looking at impedance on 12M amd 15M, they look very similar to me, hard to tell any differense at all, be it 12M, 15M or even 15W and 18W

I use 15W, and as far as I can tell, its not distortion that bugs it - I use a series xo inductor of about 0.3mH with RC and notch, and I have coated the dustcap very lightly with bitumen

21st April 2007, 07:07 PM	#1
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	ScanSpeak 4" midrange (12M_4631G00) Distortion Tests Hi, I have not seen these published so thought I should share them. Zaph has some of the larger ScanSpeak revelator sliced paper cones but not this smaller 4" midrange. I will leave it to the viewer to interpret the results. It was referenced to 90dB/1m@1KHz. Two samples were tested and both were extremely similar so there is good matching between the drivers.

21st April 2007, 11:55 PM	#8
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Doubling the distance decreases SPL by 6dB, does it not? __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

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21st April 2007, 07:59 PM	#2
Jed diyAudio Member Join Date: Nov 2004 Location: Rochester, NY	Zaph did tests of the 12M as well. Check again.

21st April 2007, 08:17 PM	#3
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Ahh yes so he has. It is a pretty new addition - 4th Feb 07. I had not looked since before then. Still it is nice to see his results match mine quite closely.

21st April 2007, 09:30 PM	#4
ShinOBIWAN diyAudio Member Join Date: Feb 2004 Location: UK	Thanks Simon, always nice to have a second or third set of distortion tests. I very nearly used this midrange myself but its a poor performance overall considering the price. For comparison take a look at the ATC 3" dome mid tested at 90dB at 2m(93dB/1m):

21st April 2007, 09:41 PM	#5
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Yeah, the ATC has VERY impressive disto specs. Not bad CSD either. But it is more expensive isn't it? Also it simply isn't suitable for the project I have in store.

21st April 2007, 09:48 PM	#6
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	I also took some measurements of the Hi-Vi RT1.3 isoplanar ribbon tweeter. Click This is a rather nice tweeter for use above 3.5KHz. It offers very low disto as you can see but it also means you have the choice of a ribbon-like dispersion pattern. Maybe good for a MTM layout? Consider that this tweeter costs about £15 each inc.VAT and we are really talking Oh yes, the other reason I really like this tweeter is that it has a completely flat impedance. So it will work with text-book crossovers.

22nd April 2007, 01:22 AM	#9
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Only in true free field

22nd April 2007, 01:55 AM	#10
tinitus diyAudio Moderator Join Date: Nov 2005	Shin, how can you say that 12M lacks the copper short rings Looking at impedance on 12M amd 15M, they look very similar to me, hard to tell any differense at all, be it 12M, 15M or even 15W and 18W I use 15W, and as far as I can tell, its not distortion that bugs it - I use a series xo inductor of about 0.3mH with RC and notch, and I have coated the dustcap very lightly with bitumen

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