I want to connect my PS2a to my combo amp speaker using a 1/4 inch female to female adapter as shown in example 2 in the manual. Does it matter what adapter I use? Does it need to be mono or stereo? Can I do damage if I get the wrong kind?
Hey @rmechler welcome to the community 
You want a mono one; any adapter will do, but I would buy the highest quality one you can afford. If you’re still unsure, post information about the adapter you want to buy.
Regards,
Dan
Thanks, Dan. This one looks decent, despite being relatively cheap and only coming in a 5-pack
Ancable Premium 5-Pack 1/4" Coupler Adapter
Unfortunately it’s supposed to take 2 to 4 weeks. This one I can get today
SHANFEILU 1/4 Inch TRS TS Coupler
which seems cheaper but might do the trick
Stick with the first one. TRS means stereo.
https://a.aliexpress.com/_EIy9OfI
https://a.aliexpress.com/_Ex3B1u8
Other options