Jkull, like the majority of phono stages the ZP3 appears to not provide a volume control. Therefore to be able to control the volume you would connect it to one of the 219ia’s inputs that does NOT bypass its preamp section (i.e., to one of the inputs other than "pre-in"). And therefore a 12AX7 upgrade is likely to be worthwhile.
A follow-up regarding your earlier question about hooking up your sub. If you are willing to invest $207 (plus cabling) for that purpose, here you go:
http://www.cs1.net/products/jensen_transformers/SP-2SX.htm
And here is a link to the manufacturer’s datasheet:
http://www.jensen-transformers.com/wp-content/uploads/2014/07/SP-2SX.pdf
Many other devices claiming to perform the same function are available for much lower prices, but in contrast to most or all of them the products of the Jensen Transformers company are frequently used and are well respected by high end audiophiles.
Good luck. Regards,
-- Al
A follow-up regarding your earlier question about hooking up your sub. If you are willing to invest $207 (plus cabling) for that purpose, here you go:
http://www.cs1.net/products/jensen_transformers/SP-2SX.htm
And here is a link to the manufacturer’s datasheet:
http://www.jensen-transformers.com/wp-content/uploads/2014/07/SP-2SX.pdf
Many other devices claiming to perform the same function are available for much lower prices, but in contrast to most or all of them the products of the Jensen Transformers company are frequently used and are well respected by high end audiophiles.
Good luck. Regards,
-- Al