I'm not sure if this is possible (I'm a complete beginner) but is it possible to filter out frequencies above approximately 30khz between a preamp/prepro and power amp?
The prepro is listed as 560 Ohm at the XLR output
The power amp is listed as 47 KOhm at the XLR Input
This looks useful but I'm unsure which resistance to use or if it is even suitable:
Low Pass Filter Calculator
The prepro is listed as 560 Ohm at the XLR output
The power amp is listed as 47 KOhm at the XLR Input
This looks useful but I'm unsure which resistance to use or if it is even suitable:
Low Pass Filter Calculator
It would be best to install the filter inside the power amplifier. Often there already is a LP filter,
series R and shunt C, and you would just lower the frequency by increasing the C.
Do you have a schematic of the amplifier?
series R and shunt C, and you would just lower the frequency by increasing the C.
Do you have a schematic of the amplifier?
I dont have a schematic, the amplifier uses these Hypex amp modules with XLR directly connected:
https://www.hypex.nl/img/upload/doc/ncore_mp/nc502mp/Documentation/NC502MP_02xx_03xx.pdf
https://www.hypex.nl/img/upload/doc/ncore_mp/nc502mp/Documentation/NC502MP_02xx_03xx.pdf
30khz? There is nothing that high in modern recorded music and if the amp is class D it has a high cut filter already to block switching noise.
Why do you think you need this filter?
I get some idle hiss using Ribbon tweeter speakers. Similar sensitivity dome tweeter speakers are silent.
I also saw this:
Hypex Ncore NC400 - input anti-alias filter?
I also saw this:
Hypex Ncore NC400 - input anti-alias filter?
Is the noise present with shorted amplifier inputs? Does it vary with the setting of the volume control?
What is your preamplifier, or other source that is driving the amplifier?
Exactly what equipment is this?
Where are the input trims on the amplifier set?
It's common practice to set amp input trims to max in pro audio application but this raises the noise floor too much for home use, so I'd suggest only turning them up as much as necessary to get the SPL you require.
Start with the power amp input trims all the way down, set the preamp volume control at the 12 0-clock position, play a track and bring up the power amp trims to get the maximum sound level you feel you will want. The preamp volume control can be used from then on to adjust levels.
Where are the input trims on the amplifier set?
It's common practice to set amp input trims to max in pro audio application but this raises the noise floor too much for home use, so I'd suggest only turning them up as much as necessary to get the SPL you require.
Start with the power amp input trims all the way down, set the preamp volume control at the 12 0-clock position, play a track and bring up the power amp trims to get the maximum sound level you feel you will want. The preamp volume control can be used from then on to adjust levels.