You can buy a different amp with lower input sensitivity. You can't change the Cary to get higher output other than the triode/UL option afforded. KT88's are high output tubes so rolling them won't make much or any difference.
You can buy an active pre-amp and get units with up to about 26db of gain which would be plenty.
You can get a CDP/DAC with high gain output (my Wadia had 2, 4 & 6db options).
Other than that about the only thing I can think of would be a possible problem with the passive set up, ie. using inappropriate IC's (too long or electrical values) but I doubt that this is your problem as that would be more frequency dependent than broadband unless they were really long!
But, FWIW, something just doesn't seem right to me about this 'problem'. It is almost as if something is damping your system down. With 87db speakers and 60wts you should be getting some very loud sounds even without pre-amp gain added. Are you using more than one pair of outputs from the 'preamp'? Some pre-s have two outputs which do no act independently of each other and create an additional load on the line out and can greatly reduce the pre-amp out put.
Anyway, that's all I know. Hope it helps a but.
You can buy an active pre-amp and get units with up to about 26db of gain which would be plenty.
You can get a CDP/DAC with high gain output (my Wadia had 2, 4 & 6db options).
Other than that about the only thing I can think of would be a possible problem with the passive set up, ie. using inappropriate IC's (too long or electrical values) but I doubt that this is your problem as that would be more frequency dependent than broadband unless they were really long!
But, FWIW, something just doesn't seem right to me about this 'problem'. It is almost as if something is damping your system down. With 87db speakers and 60wts you should be getting some very loud sounds even without pre-amp gain added. Are you using more than one pair of outputs from the 'preamp'? Some pre-s have two outputs which do no act independently of each other and create an additional load on the line out and can greatly reduce the pre-amp out put.
Anyway, that's all I know. Hope it helps a but.