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Old 26th November 2002, 03:42 PM   #1
hacknet is offline hacknet  Singapore
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Default need help on my config

hi guys... im a newbie... so please be gentle...

i have problems getting my amp and speakers to sound good.

i do not have much cash so i use wad i find... mostly second hand from 2nd hand shops....

i am running my audio off my computer... into a car amp into a pair of sony speakers

My amp is a ADX 50w RMS car amp running of a old com power supply with a 12000uf cap as a filter. it iz clean.

my spkers are old sony wood speakers about a meter high with a tweeter, woofer and a odd piece of white plastic covering the bottom hold... i think iz a reflex of sum sort..

i have problems..

the music is coloured with switching noise from the computer as the computer's ps iz not clean... there for dirties the sound to an audioable level.

to remedy this... i have put a 100uf cap in parellel to filter it out..
but... it causes the sound to be very low and i cant hear the highs.... please help me!! thx!!
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Old 26th November 2002, 04:10 PM   #2
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Is the noise a buzzing at AC line frequency? If so,
it might be a ground loop with your computer. Also
if so, you might try floating one of the AC power grounds
in the system.

Otherwise, I would say forget it. Burn the music to CD's
and play it on a portable player.
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Old 26th November 2002, 04:18 PM   #3
hacknet is offline hacknet  Singapore
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well burning it on a cd iz a nice idea...

the other prob being that i cant get the low f when the cap is taken out... and cant get the hf when the cap is place... is a tone control useful?

do you have the schematics for any tone controls?
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Old 26th November 2002, 11:39 PM   #4
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Hi Hack, and welcome

Have you tried just running your amp off a car battery? Even if it doesn't last for long periods it should give you an idea of how you setup would sound without a cheap power supply and will give you an idea of if you need to change the amp/ speakers or not.

You might be better off selling the car amp, and using the money to build your own amp, try searching on Nelson's forum, or maybe try a gainclone, I bet it will sound a hell of a lot better than your existing setup.

Good luck
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Old 27th November 2002, 03:23 AM   #5
hacknet is offline hacknet  Singapore
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ive tried building amps but their normally not sucessfull...
plus it normally costs about a good 100 s'pore $$.... so i cant afford blowing out too many
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Old 27th November 2002, 03:44 AM   #6
halojoy is offline halojoy  Sweden
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Are you taking the audio from a connection
from a soundcard, or is it from the motherboard of the PC?
What interconnect cable do you use?
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Old 27th November 2002, 06:26 AM   #7
hacknet is offline hacknet  Singapore
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iz a aztech isa snd card... iz not an on board... im using cheap $0.10 a meter paired copper wire
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Old 27th November 2002, 07:18 AM   #8
MWP is offline MWP  Australia
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I wouldnt be suprised if your old soundcard is causing the problems.
Old soundcards dont have good shielding from PCs PSU noise.
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Old 27th November 2002, 07:22 AM   #9
yeti is offline yeti  Germany
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Default hum & buzzing

Try to cut the shield of your audio cable and insert a 10 Ohms resistor, this will reduce the compensaton currents between both devices.
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Old 27th November 2002, 07:28 AM   #10
hacknet is offline hacknet  Singapore
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Default Re: hum & buzzing

Quote:
Originally posted by yeti
Try to cut the shield of your audio cable and insert a 10 Ohms resistor, this will reduce the compensaton currents between both devices.
the resistor is supposed to go in series or in parellel?
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