pre amp/amp advice

[Flathead31coupe]

I currently have a kenwood kc-x1 and km-x1 with two 4ohm cv at15 1987. Been rockn out for many years.. So I purchased a crown dc-300, and had a few questions. First is my pre amp has 1.2 v/390ohm output, and the crown is 1.75v..will there be any issues...also there is a switchs on the crown that say hysteresis and normal..can anyone explain...i think it has something to do with ohm load...my cvs are 4ohm.

 

[WaynePflughaupt]

There should be no issue – most likely the KC-X1 puts out more voltage than its 1.2v spec.

Does the Crown manual not explain about hysteresis?

Regards,
Wayne A. Pflughaupt

 

[Flathead31coupe]

There should be no issue – most likely the KC-X1 puts out more voltage than its 1.2v spec.

Does the Crown manual not explain about hysteresis?

Regards,
Wayne A. Pflughaupt

yes but its hard to understand, it said that hysteresis is for operation with loads requiring large reactive currents. some 4 ohm loud speaker systems and such fall into this category. ...does that mean that my 4 ohm cv speakers fall in that category,and i should use that switch position?

 

[TLS Guy]

yes but its hard to understand, it said that hysteresis is for operation with loads requiring large reactive currents. some 4 ohm loud speaker systems and such fall into this category. ...does that mean that my 4 ohm cv speakers fall in that category,and i should use that switch position?

I would not use that Crown 300. There is no speaker protection from DC offset. I specked and used a couple of those in a biamped auditorium speaker installation when they were all the range. On opening night an output power transistor failed and sent the whole DC rail voltage through one of the mid/HF line source arrays and fried 8 expensive drivers. Needless to say those amps were outed pronto. Those amps developed a terrible reputation for blowing up speakers.

 

[Flathead31coupe]

so I was reading that my kenwood puts input sensitivty on the front speakers is 1.2v i just bought a mac mc2255 that has a input sensitivty of .75 or 2.5 .question is how will this effect my sound, and which sensitivity setting on my mac do I use...thanks

 

[Flathead31coupe]

i think iam looking at the wrong thing on the spec sheet...could someone help, thanks

 

[TLS Guy]

yes but its hard to understand, it said that hysteresis is for operation with loads requiring large reactive currents. some 4 ohm loud speaker systems and such fall into this category. ...does that mean that my 4 ohm cv speakers fall in that category,and i should use that switch position?

That means electrostatic loudspeakers which are highly reactive loads. and prone to make a lot of amps unstable, go into oscillation and blow up.

 

[TLS Guy]

i think iam looking at the wrong thing on the spec sheet...could someone help, thanks

The only thing you should be worried about is failure of a power transistor sending a speaker up in smoke. The fact is you should not be using and old amp like that Crown 300 that does not have DC offset protection period. Keep it as an ornament, but do not use it.

 

[Flathead31coupe]

sry tls guy i do not have the crown but now have the mac mc 2255... need help with the sensitivity setting, when using my kenwood per amp untill i get a different per amp

 

[TLS Guy]

sry tls guy i do not have the crown but now have the mac mc 2255... need help with the sensitivity setting, when using my kenwood per amp untill i get a different per amp

Set it at 2.5 volts

 

[Flathead31coupe]

thanks any suggestions on a matching mac pre amp

 

[Flathead31coupe]

also by looking at the spec sheet. When someone asks what the input sensitivity is..
what is it.thanks