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Old 27th July 2012, 01:16 AM   #481
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Quote:
Originally Posted by Melon Head View Post
Cracking sound? Bloody hell. Are you sure that the drivers were not damaged or faulty?
I don't think so. They were brand new. A friend sent them to me for testing.

There's no cracking with music playback. It came on when I did a Gated sweep.

I'm sure the cracking sound can be produced with a normal sine sweep. If you have a signal generator, do a manual sine sweep with the amp's output at 2.83Vrms. Start at 1kHz and slowly sweep upwards. Between 4kHz to 6kHz, see whether there is one frequency where the whizzer vibrates uncontrollably. You may want to get hold of some ear plugs/muffs before doing this. The AN is pretty loud at 2.83Vrms.

I'm not implying that the AN are bad drivers. Just something I picked up when I tested the AN12 CF.
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Old 27th July 2012, 01:18 AM   #482
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Great news. No worries then
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Old 27th July 2012, 01:28 AM   #483
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Quote:
Originally Posted by Michael Chua View Post
I don't think so. They were brand new. A friend sent them to me for testing.

There's no cracking with music playback. It came on when I did a Gated sweep.

I'm sure the cracking sound can be produced with a normal sine sweep. If you have a signal generator, do a manual sine sweep with the amp's output at 2.83Vrms. Start at 1kHz and slowly sweep upwards. Between 4kHz to 6kHz, see whether there is one frequency where the whizzer vibrates uncontrollably. You may want to get hold of some ear plugs/muffs before doing this. The AN is pretty loud at 2.83Vrms.

I'm not implying that the AN are bad drivers. Just something I picked up when I tested the AN12 CF.
exactly the drivers i have.

i am pretty ******* sure that if the AN12CF had such an issue it would be pretty well known here on these forums.

something is going wrong but if this proves to be a general characteristic of the AN12CFs i will shave my testicles with a rusty spoon
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Old 27th July 2012, 01:30 AM   #484
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Originally Posted by Michael Chua View Post
You may want to get hold of some ear plugs/muffs before doing this. The AN is pretty loud at 2.83Vrms.

Just something I picked up when I tested the AN12 CF.
Now this is exactly the type of crazy stuff that interests me. LMAO Seriously though I would be asking to have them replacec. Even though 1W is way above what I listen at. I wouldn't put up with that. I would be complaining about it to David.

Last edited by Melon Head; 27th July 2012 at 01:35 AM.
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Old 27th July 2012, 01:32 AM   #485
tsiros is offline tsiros  Greece
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i'm sorry at 0.61V rms i am stopping the test because it's 3am here and well, the cat started panicking. Now he left the house and has gone to the far end of the balcony.
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Old 27th July 2012, 01:43 AM   #486
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Regarding amps. I have changed my mind. I reckon F4 or BA1 output. You don't need voltage gain with these speakers.
F3 and Aleph J are bloody nice though.

Last edited by Melon Head; 27th July 2012 at 01:47 AM.
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Old 27th July 2012, 01:48 AM   #487
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The AN I tested were the Super 12CF. The top (violet) plot is the Gated Sweep from 1K-20K. The bottom plot (green) is without gating from 200Hz-20K.
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File Type: jpg SUPER12_RAW.jpg (57.4 KB, 133 views)
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Old 27th July 2012, 01:50 AM   #488
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i'm sorry at 0.61V rms i am stopping the test because it's 3am here and well, the cat started panicking. Now he left the house and has gone to the far end of the balcony.
LMAO. Can you do a youtube video of that. Crazy. I like it
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Old 27th July 2012, 01:54 AM   #489
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michael chua, what mic do you have?
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Old 27th July 2012, 01:59 AM   #490
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Hey Michael can you do the same test on the Seas at 100dB? We can compare results when I start measuring
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