Hi,

It seems the earlier mail raised more questions. See the answers below

"Arny Krueger" wrote in message ...
"Varghese Devassy" wrote in message
om
Hi,

I have a SimAudio I5 integrated amp connected to KEF Q7 Speakers. I
notice that there is a slight hum in one the speakers.

What do you mean by "slight"?

(1) Hear it while you're playing music?

(2) On a quiet night, with your ear right next to the woofer cone, you hear
a little him?

What I mean by slight is that I have to have my ear right next to the
wooder to hear the hum

Any ideas how
this may be caused and could be eliminated. I tried the following with
no difference in the hum

1. Provide enough separation between power cord from the speaker
cables

Futile in virtually every case.

2. Line filter

Futile in virtually every case.

3. Interchanged the speakers

Did the hum stay with the speaker or the channel of the amplifier?

The hum stays with the channel. My guess is that they have the
transformer closer to the right speaker inside the amp whose hum is
being picked up

4. Tried without connecting any signals to the amp (removed all input
cables)

Suggests the hum is due to the amp.

5. Send mail to SimAudio and they asked me to connect line filter

Bunch of maroons, aren't they?

I had auditioned NAD, Rotel amplifiers and did not see any hum from
them. Also, I find the hum is more in the right speaker.

Dig you audition the amps at a dealer or in your home?

If you auditioned at a dealer, the comparison is probably not valid.

All the auditioning were done at home. Using NAD, Rotel, Classe and
SimAudio. Of the above NAD and Rotel had no hum. However, noticed
slight hum in Classe and SimAudio. I picked SimAudio I5 as this
sounded better than all the above


I am using good quality interconnects and speaker cables (straight
wire). My source is only a CD players and the hum is there regardless
of whether it is on or off

Suggests the hum is due to the amp.

I see the hum in all of their amps such as I5080, I3

Suggests the hum is due to the amp.


Any ideas please let me know

Get a better amp, next time. Different brand! Insist on a home trial.


This is a much better amp (I know this is very subjective) than NAD,
Rotel, Classe. I have listened to all the above

Thanks

Varghese Devassy