In addition to the previous post about problem with the Lamm LL2.1, It's a brand new preamp, running hour at about 30-40 hour when the problem started occured.
When paired it with McCormack DNA 0.5 deluxe and Totem Model 1 speakers. The Lamm+McCormack Combo produces an unexpected and intermitten movement of the totem woofer cone back and forth. But when the Lamm replaced by other preamps (SFL-1 or Graaf or Mark Levinson 380 preamp), the system going fine.
In the other case, when the Lamm paired with a tube power amp, things also doing fine.
Perhaps, because The DNA power amp is a Direct Coupled design, it passing whatever signals, good or bad, coming from the Lamm directly to the speakers, which then produce a sporadic woofer movement. In the case of highly fluctuated DC offset in the Lamm, this then create problem to the system.
Anybody can help?
When paired it with McCormack DNA 0.5 deluxe and Totem Model 1 speakers. The Lamm+McCormack Combo produces an unexpected and intermitten movement of the totem woofer cone back and forth. But when the Lamm replaced by other preamps (SFL-1 or Graaf or Mark Levinson 380 preamp), the system going fine.
In the other case, when the Lamm paired with a tube power amp, things also doing fine.
Perhaps, because The DNA power amp is a Direct Coupled design, it passing whatever signals, good or bad, coming from the Lamm directly to the speakers, which then produce a sporadic woofer movement. In the case of highly fluctuated DC offset in the Lamm, this then create problem to the system.
Anybody can help?