I don't have my manual handy, but recall reading somewhere(possibly in the manual, possibly on the ACI website) that the speaker level adapter had a "built in resistance". The only question is how much resistance? I would like to find out too since I would like to fabricate a speaker level adapter for mine too (I bought one used, without the adapter). I'm using the low level connection now.
Maybe there is someone out there who can put a meter on their Speaker level adapter and tell us what the resistance is??
In your case you may want to just get an RCA Y adapter to use for the time being with your preamp.
Maybe there is someone out there who can put a meter on their Speaker level adapter and tell us what the resistance is??
In your case you may want to just get an RCA Y adapter to use for the time being with your preamp.