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The New Hypex Fusion Plate amps
The New Hypex Fusion Plate amps
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Old 14th February 2020, 04:42 AM   #2031
mlee is offline mlee  Canada
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Join Date: Jan 2011
Quote:
Originally Posted by cowanaudio View Post
There is a procedure to follow on page 17 of the Fusion amp manual that increases gain. I've done this on a pair of my Fusion amps.
Oh wow, totally missed this! Many thanks!!
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Old 15th February 2020, 03:09 PM   #2032
mlee is offline mlee  Canada
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Quote:
Originally Posted by fedde View Post
For the Fusion 253, the resistor values are:

Rf = 3k3, Rg = 1.8k (Rg = R76 and R162)

See manual posted above how to calculate the gain. If you want to lower the gain, you need to raise Rg.

On the NC100HF tweeter board, you need to look for R76. The resistor values are the same there...

Fedde
Thanks for this Fedde, I was wanting to reduce the gain. Just FYI the NC100HF R76 resistor value is 4.7k. I did 2 mods, reduced the input voltage as per page 17 of the user manual and removed the gate resistors all 3 channels of my FA253. This cleaned up the gain structure of my system.

For what its worth, low level listening seems to have a bit more resolution but I was expecting a change so maybe there is nothing there .

The amp worked after so that is good! I don't have correct screwdriver to undo the bolts for the input gain change so carefully used a 5/16 hex.
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Old 15th February 2020, 03:12 PM   #2033
Rokytheman is offline Rokytheman  Denmark
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Quote:
Originally Posted by cowanaudio View Post
They work fine 200Hz up in designs I've worked on. These were 100dB/W/M horns in domestic settings. Bass was both channels of a FA253 or FA503.
Thanks !
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Old 16th February 2020, 05:53 PM   #2034
fred sonnen is offline fred sonnen  Germany
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Join Date: Dec 2014
Question FA-253 DIY "clone"?

I'm not sure that such a question hasn't already been asked ...


Is it actually possible to reproduce (DIY- style...) a fusion amp-fa253 in its functional groups?
More precisely:

  • 3x Purifi 1et400a amps including Hypex SMPS's
  • Protection circuits / switch-on delay (What would be recommended?)
  • A Hypex crossover / DSP would be set!
Why? I think the Purifi are some kind of "better" but I will get some ready made X-over files I have to use. So a functional 1:1 copy of a FA-253 DSP /X-over is set.
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Old 16th February 2020, 09:40 PM   #2035
Alex Music is offline Alex Music  Europe
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Join Date: Sep 2018
Hello,
I have a problem and I can't find a solution.
I use Hypex FA503 modules and they overheat.
The fan turns on often, even when the speakers do not work.
Do I just have this problem?
The noise of the fan is disturbing ...
Did anyone find a solution?
Thanks in advance.
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Old 16th February 2020, 10:08 PM   #2036
TNT is offline TNT  Sweden
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Join Date: Apr 2003
Location: Sweden
The New Hypex Fusion Plate amps
Describe (all!) the speakers you have connected?

//
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More distortion to the people! Timing . . . . is paramount.
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Old 16th February 2020, 10:23 PM   #2037
Alex Music is offline Alex Music  Europe
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Join Date: Sep 2018
I use the following speakers:
Subs = 2 X SBA SW26DAC76-8 in parallel = 4 ohm
Mid = SBA SB17CAC35-4
Tweeter = Seas H1147-06 27TBC/G
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Old 17th February 2020, 06:27 AM   #2038
ds23man is offline ds23man  Netherlands
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Join Date: Oct 2006
Location: Hypex's doorstep
Quote:
Originally Posted by Alex Music View Post
Hello,
I have a problem and I can't find a solution.
I use Hypex FA503 modules and they overheat.
The fan turns on often, even when the speakers do not work.
Do I just have this problem?
The noise of the fan is disturbing ...
Did anyone find a solution?
Thanks in advance.
Both plates? Please post some pictures.
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Old 17th February 2020, 06:38 AM   #2039
Alex Music is offline Alex Music  Europe
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Yes, both.
Attached Images
File Type: jpg 20191205_150128.jpg (635.4 KB, 251 views)
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Old 17th February 2020, 07:46 AM   #2040
ds23man is offline ds23man  Netherlands
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Location: Hypex's doorstep
Very strange. When you switch them on and leave them on with no signal, do the fans come on after a while?
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