ScanSpeak 4" midrange (12M_4631G00) Distortion Tests - diyAudio
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Old 21st April 2007, 08:07 PM   #1
Tenson is offline Tenson  United Kingdom
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Default 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.

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Old 21st April 2007, 08:59 PM   #2
Jed is offline Jed  United States
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Zaph did tests of the 12M as well. Check again.
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Old 21st April 2007, 09:17 PM   #3
Tenson is offline Tenson  United Kingdom
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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.
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Old 21st April 2007, 10:30 PM   #4
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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):

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Old 21st April 2007, 10:41 PM   #5
Tenson is offline Tenson  United Kingdom
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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.
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Old 21st April 2007, 10:48 PM   #6
Tenson is offline Tenson  United Kingdom
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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

Click the image to open in full size.

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.
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Old 21st April 2007, 10:50 PM   #7
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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.
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Old 22nd April 2007, 12:55 AM   #8
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Doubling the distance decreases SPL by 6dB, does it not?
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Old 22nd April 2007, 02:22 AM   #9
Tenson is offline Tenson  United Kingdom
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Only in true free field
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Old 22nd April 2007, 02:55 AM   #10
tinitus is offline tinitus  Europe
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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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