Hi everyone,
Not only am I new to to Krell equipment, as my username implies, but also to this forum, so please "cut me a bit of slack!"
I have recently aquired a KAV250a/3 and I am not sure that all is in order with it, hence I am looking for some thoughts, ideas and possibly suggestions from other Krell owners. I am targetting the Krell community, but maybe one or more of these apparent issues could also apply to other equipment too?
Anyhow, the particular issues I have with this amp:
1/ the on/off switch does not always do what it's name implies. The switch is more likely to turn the amp on than it is off. It can operate normally, it can take a couple of presses, but it can take even more, especially when turning off.
2/ I have noted some distotrtion on one of the channels. I call it the centre channel as it is the middle of the three sets of terminals. I have connected the speakers logically left front to left terminal, centre to centre and right front to right, when looking from the front.
3/ Unequal gain? When setting up the front channels in the AVR I find I need to have a higher output for the centre channel to achieve equal volumes from the front 3 speakers. The centre speaker is, I believe, the most sensitive (Klipsch RP440C rated at 97db @ 2.83v 1meter), my left and right speakers (Yamaha NS1000M) are rated at 90db (1 watt input measured @ 1m). When other amplifiers drive the same front end I have to increase the L and R output from the AVR to achieve equal output at the speakers. With this Krell it is the opposite, I have to increase the centre. Couple this with the distortion issue on the centre, I believe something is not quite right with the centre channel?
What I have done so far:
The amp was connected intially to a mains block with other equipment. I have since separated the amp from this supply and gave it a dedicated feed (13A). No change.
I have also checked the mains supply by plugging a 3kw kettle into the socket. My meter registered 2,900+ watts (Krell claim the 250a/3 draws a max. of 1,930), so power supply should not be an issue?
The 250a/3 draws close to 500 watts on switch on and settles back to around 150 watts initially on idle. (Krell suggest this variant draws 235 watts in the idle state).
When watching movies at decent levels, the amp generally draws 180 - 190 watts when warm, at which it sounds rather good. I have never seen the amp draw above 200 watts when running (not wishing to annoy neighbours!).
When the distortion is audible (it is intermittant), I notice the figure on the meter drops by around 30 watts, or roughly 20%.
The amp is very quiet in opeartion at all times and / but it does get quite warm underneath, I measured 48.2C.
In case it makes any difference, I am in the UK and mains voltage is around 240 volts.
If you have experience with these amplifiers or knowledge that can help identify possible causes and rectification I would very much like to hear any comments.
Many thanks in advance
Not only am I new to to Krell equipment, as my username implies, but also to this forum, so please "cut me a bit of slack!"
I have recently aquired a KAV250a/3 and I am not sure that all is in order with it, hence I am looking for some thoughts, ideas and possibly suggestions from other Krell owners. I am targetting the Krell community, but maybe one or more of these apparent issues could also apply to other equipment too?
Anyhow, the particular issues I have with this amp:
1/ the on/off switch does not always do what it's name implies. The switch is more likely to turn the amp on than it is off. It can operate normally, it can take a couple of presses, but it can take even more, especially when turning off.
2/ I have noted some distotrtion on one of the channels. I call it the centre channel as it is the middle of the three sets of terminals. I have connected the speakers logically left front to left terminal, centre to centre and right front to right, when looking from the front.
3/ Unequal gain? When setting up the front channels in the AVR I find I need to have a higher output for the centre channel to achieve equal volumes from the front 3 speakers. The centre speaker is, I believe, the most sensitive (Klipsch RP440C rated at 97db @ 2.83v 1meter), my left and right speakers (Yamaha NS1000M) are rated at 90db (1 watt input measured @ 1m). When other amplifiers drive the same front end I have to increase the L and R output from the AVR to achieve equal output at the speakers. With this Krell it is the opposite, I have to increase the centre. Couple this with the distortion issue on the centre, I believe something is not quite right with the centre channel?
What I have done so far:
The amp was connected intially to a mains block with other equipment. I have since separated the amp from this supply and gave it a dedicated feed (13A). No change.
I have also checked the mains supply by plugging a 3kw kettle into the socket. My meter registered 2,900+ watts (Krell claim the 250a/3 draws a max. of 1,930), so power supply should not be an issue?
The 250a/3 draws close to 500 watts on switch on and settles back to around 150 watts initially on idle. (Krell suggest this variant draws 235 watts in the idle state).
When watching movies at decent levels, the amp generally draws 180 - 190 watts when warm, at which it sounds rather good. I have never seen the amp draw above 200 watts when running (not wishing to annoy neighbours!).
When the distortion is audible (it is intermittant), I notice the figure on the meter drops by around 30 watts, or roughly 20%.
The amp is very quiet in opeartion at all times and / but it does get quite warm underneath, I measured 48.2C.
In case it makes any difference, I am in the UK and mains voltage is around 240 volts.
If you have experience with these amplifiers or knowledge that can help identify possible causes and rectification I would very much like to hear any comments.
Many thanks in advance