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Old 22nd August 2010, 10:30 PM   #1751
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Quote:
Originally Posted by fakamada View Post
Hi. I just finished basic modifications.

1. Removed input suppressors
2. Replaced input caps (PIO - Bosch MP 2uF)
4. Installed Zalman zm-47j
5. Wuerth XXL coils 4R7

WoW ! The change in sound is insane !!! I'd never expect it !

Clarity, air, bass and soundstage which is now much more layered. I still can't belive what I'm hearing...

Thanks to all of you for your input in this thread.
awesome amp nicely done.i do plan on building one of those when my subwoofer project is done.i know the original heatsink had a fan on it.are you having any heat issues with the fanless one?
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Old 23rd August 2010, 07:17 AM   #1752
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Cheers guys, will do the connector tests and see what works best.

Btw, let me describe a bit what I have in mind:

The system will be used as studio monitor and sometimes as a small PA for voice/wind instruments.

Unbalanced mixer output fed into the crossover I was talking about, whose high and low outputs are then fed into the 4*100W board, for powering two 2-way speakers.

Each speaker has one 120W 10" 4Ohm (car) woofer and one 100W 8Ohm (professional) tweeter.

Do you see any problem in having the amp power at the same time these different impedance drivers? The tweeter will get max. 50W, right?

Thank you all for your help!!
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Old 23rd August 2010, 09:00 AM   #1753
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i see no problems with the different impedances,as long as the crossover is correct for each.i sometimes run my low power dayton dta-1 on 8 ohm bookeshelves,and a dual 4ohm sub.ive had zero issues with that arrangement.
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Old 23rd August 2010, 10:26 AM   #1754
sendler is offline sendler  United States
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Default Heatsink temp

Quote:
Originally Posted by pharoahra View Post
awesome amp nicely done.i do plan on building one of those when my subwoofer project is done.i know the original heatsink had a fan on it.are you having any heat issues with the fanless one?
That heatsink works well and will run about 40C.
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Old 24th August 2010, 12:01 AM   #1755
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Originally Posted by sendler View Post
That heatsink works well and will run about 40C.
cool thanks for the info.
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Old 24th August 2010, 07:35 AM   #1756
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Quote:
Originally Posted by pharoahra View Post
awesome amp nicely done.i do plan on building one of those when my subwoofer project is done.i know the original heatsink had a fan on it.are you having any heat issues with the fanless one?
Yes. Heatsink and coils get quite hot. I have tried to connect a big 12V 12cm fan to 5v rail and I didn't hear any pollution going through speakers. The small, fast original fan was VERY loud through my highly effective tweeters.
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Old 24th August 2010, 01:53 PM   #1757
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I've just tried 3 different 12v fan through 5v rail. 2 of them vere dead quiet and one very loud. The loud one was also the fastest.

I've figured smth like this with original Sure's fan which is OK.
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Old 24th August 2010, 05:45 PM   #1758
sendler is offline sendler  United States
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Default Original fan

Quote:
Originally Posted by fakamada View Post
I've just tried 3 different 12v fan through 5v rail. 2 of them vere dead quiet and one very loud. The loud one was also the fastest.

I've figured smth like this with original Sure's fan which is OK.
Is the original Sure third version fan ok? I thought they were electrically noisy.
That heat sink should be ok with no fan.
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Old 24th August 2010, 07:17 PM   #1759
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Quote:
Originally Posted by fakamada View Post
I've just tried 3 different 12v fan through 5v rail. 2 of them vere dead quiet and one very loud. The loud one was also the fastest.

I've figured smth like this with original Sure's fan which is OK.
good to know.i may make a fan mount in my chasis which will be very close to the heatsink anyway.im thinking a fan like this the noctua fans are known in the pc world to be very quiet.
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Old 24th August 2010, 07:26 PM   #1760
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Quote:
Originally Posted by sendler View Post
Is the original Sure third version fan ok? I thought they were electrically noisy.
That heat sink should be ok with no fan.
I just wanted to give it a try. Connected to 12v it is VERY noisy. The very same fan connected to 5v is almost dead quiet even with my ear right next to the tweeter.

I'm also thinking about sticking little radiators to Wuerths coils.
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