I've tried 2 of these amps so far, one from SUCCA-audio, the latest is SMSL SA-89e. They both have floor noise problems. The first had a high pitched whine, the SMSL has a loud hiss. Even with no input. Tried multiple power supplies. I'm using infinity R152 speakers (100w 8ohm, 87db). I can't keep spending money trying out new amps.
I've searched for weeks online for a better alternative or a modification to help with this problem, but I've found nothing definitive. At best it seems a TPA3251 based amp, or a dual 3116 may have less noise floor, but I'm not sure. Can anyone here offer any advice? I'm not afraid to open this thing up and solder, either.
Thanks
I've searched for weeks online for a better alternative or a modification to help with this problem, but I've found nothing definitive. At best it seems a TPA3251 based amp, or a dual 3116 may have less noise floor, but I'm not sure. Can anyone here offer any advice? I'm not afraid to open this thing up and solder, either.
Thanks
If these were sourced through fleabay, they are probably seconds and need to be returned as faulty.
Hiss is a noisy TDA7498 but whine could be poor filtering.
The power supply won't cause your issues.
Hiss is a noisy TDA7498 but whine could be poor filtering.
The power supply won't cause your issues.
Thanks for the response. Both the whine and hiss are plainly evident a few feet away from the speakers, even with ambient noise. However, I'm not sure it's enough to consider the units faulty. For reference, I tried another speaker, a Micca RB42 pair and there was was much less noise floor. The hiss disappeared only a few inches away. But, the Miccas did not have anywhere near the tweeter liveliness of the Infinity's.
These treble-sensitive speakers are probably making the problem worse, but now I am addicted to their sound. I'm hoping to find an amp to drive them cleanly, or modify the SMSL somehow.
Current ideas to reduce hiss:
-Try a 3251 based amp.. im suspicious- they are less than half the price of the SMSL
-Attenuate the tweeter inside the speaker.. I could live with toning it down a bit, but I may not have the experience to do this very well.
-Throw a shirt over the speaker. Cuts the hiss in half but muffles things a bit
These treble-sensitive speakers are probably making the problem worse, but now I am addicted to their sound. I'm hoping to find an amp to drive them cleanly, or modify the SMSL somehow.
Current ideas to reduce hiss:
-Try a 3251 based amp.. im suspicious- they are less than half the price of the SMSL
-Attenuate the tweeter inside the speaker.. I could live with toning it down a bit, but I may not have the experience to do this very well.
-Throw a shirt over the speaker. Cuts the hiss in half but muffles things a bit