I have personally owned a Mac 6900, but traded up to a newer design MC 207. NO autoformer! the sound is much more open .In fact I also have a mac 6300
in my kitchen and it to sounds better than the 6900. In my bedroom I have a Kav 400,less room lighting {no meters}. The newly designed 6300 has less power and no eq etc. making it affordable.The krell 400 and mac 6300 are very close . Krell a bit brighter, Mac a little warmer .Both amps power small Boston E series with Rel subs. However, in my living room, Sonus Faber Auditors with Mac pre amp and the MC 207 is superior. You should go with a newer design. Please note that the new MAC runs very cool, while the Krell being class A gets quite warm. This may be something to consider. DWALKER46
in my kitchen and it to sounds better than the 6900. In my bedroom I have a Kav 400,less room lighting {no meters}. The newly designed 6300 has less power and no eq etc. making it affordable.The krell 400 and mac 6300 are very close . Krell a bit brighter, Mac a little warmer .Both amps power small Boston E series with Rel subs. However, in my living room, Sonus Faber Auditors with Mac pre amp and the MC 207 is superior. You should go with a newer design. Please note that the new MAC runs very cool, while the Krell being class A gets quite warm. This may be something to consider. DWALKER46