There won't be an impedance issue using the headphone mini-jack output, as headphone outputs have to have low output impedance or they wouldn't be able to drive most headphones with reasonable results.
So using an adapter or adapter cable seems well worth trying, although I can envision the following possible concerns:
1)That output MIGHT not provide enough voltage to drive your system to adequate volume levels, although my guess is you'll be ok in that respect.
2)Ground loop hum could possibly be an issue, although again chances are you'll be ok in that respect.
3)I've never had much faith in the ability of 1/8" and even 1/4" connectors to maintain good contact in the event the plug or cable is physically jarred or disturbed. And a momentary loss of contact between the grounds of the plug and jack could put a large transient into the system. So I would make a point of arranging things so that the plug and cable cannot accidentally be physically disturbed.
4)Obviously the sonic quality of the circuit in the TV which drives that output is uncertain.
Regards,
-- Al
So using an adapter or adapter cable seems well worth trying, although I can envision the following possible concerns:
1)That output MIGHT not provide enough voltage to drive your system to adequate volume levels, although my guess is you'll be ok in that respect.
2)Ground loop hum could possibly be an issue, although again chances are you'll be ok in that respect.
3)I've never had much faith in the ability of 1/8" and even 1/4" connectors to maintain good contact in the event the plug or cable is physically jarred or disturbed. And a momentary loss of contact between the grounds of the plug and jack could put a large transient into the system. So I would make a point of arranging things so that the plug and cable cannot accidentally be physically disturbed.
4)Obviously the sonic quality of the circuit in the TV which drives that output is uncertain.
Regards,
-- Al