Forum Replies Created
How is the SQ of M1200 better than AS?
How long does M1200 take to FULLY warm up?
Why did you switch from AS to VTL? More power? How would you compare the sound between the two?
AS put in the option switch to go class A or A/B, to reduce the heat. Those with AS amps, how does the A/B sound compared to A? Noticeably different?
Has anyone tried Conrad Johnson tube amps with SL?
What is the size of your room? My room is only 9 x 11 and may be more sensitive to heat. I have heard that AS amps could have reliability issues. I don’t know if this was 3.2 version.
I am in the market for a new amp for my M545. I had Pass Labs X250.5 for a while and I upgraded this year to X250.8. Now I just sold my X250.8 because I want to try a tube amp. In my tiny room (9 x 11 ft), X250.5 was great; so I thought X250.8 would be even better. Nope. While it had much more power, it didn’t sound as good as X250.5. But, in my room, where I don’t play very loud, it took about 6 hours of playing to sound GREAT. I have BAT Rex2 tube preamp (300 W heat, but incredible sound), so I don’t want to use up 6 hrs of tube time just for warming up.Since tube amps don’t take more than one hour of warm up, I chose to go with a tube amp. I am considering Atma S MA1, but it generates 1000 W of heat just idling. My X250.8 generated 450 W idling and it was quite hot. I don’t know how you guys with AS gears handle the heat.Some people recommended LTA ZOTL40. I can get used Conrad Johnson amps pretty easily. Any recommendations? I want something reliable and hassle-free.
Here is the update. I put in a new Pass Labs amplifier and still no sound, so I though it was SL. Then as I was walking by SL, I accidentally hit the speaker cable and sound came on from both speakers. What I think happened is this. Previously, I mistakenly connected the red terminal to -, rather than +.So I reversed it to correct this error and, in retrospect, problems started after that. I didn’t suspect this because they were on pretty tight. But after the switch, the spade-terminal contact must not have been very good-probably the angle of it was a bit off when I reversed them. Roger West thought it was the safe mechanism on the amp. I feel like an idiot, but it is a warning for those of us who now use these stiff python-like speaker cables. You think they are on tight because the bolt feels tight but you are not getting good contact.
I confirmed that biases on both speakers work. They both crackle when dialed up. I have a new Pass Labs X250.8 coming later this week. That should tell us whether it is the amp or not. Thanks to everyone for pitching in. I will post after testing with the new amp.
I have an old Pass Labs X250.5 that was refurbished by Pass Labs 4 years ago. Amp bias meter is acting funny. When I play Bach prelude cello sonata by Jonas Starks and on sustained low note the bias needle moves noticeably. Not anymore. What threw me off is that the two channels act differently from one day to another. I bet tomorrow, the right channel will work for a while and then die.
Now I am really confused.I switched the backplates and the left speaker (now with right plates) played music quietly for a few seconds and then died. Now neither speakers are making any sound. Both speakers crackle with the bias turned up. I forgot to mention this, but yesterday the left speaker died first and then the right speaker died too. So, yesterday I thought it was the amp. So, this afternoon I turned on the system again and only the right speaker worked, so I thought it wasn’t the amp but the left speaker. Now I am thinking that it may be the amplifier with unstable output transistor or something like that. What do you think?
Thanks for the thoughtful comments. Signal cables sound like a great value if it sounds very to someone who has owned Synergistic before.
Couple of questions. What speaker cables do you use for your SLs?
What IC do you use for your Pass Labs amp? What do you recommend?
Thanks Tom. Has anyone heard the Sablon cables? They seem to be getting a lot of positive reviews lately.