How do you engage the bypass on TS Sub18?

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Hi Paul,

Thanks for posting. I'll be happy to help!

You'll need to use a pen or something else with a small tip to bypass or activate the subwoofer's high pass filter. The switch is constructed that way because you would very rarely use it. Alto didn't want somebody to accidentally activate it, so that's why its constructed in that manner. When you push it in and out, that's when you'll know how to active it or deactivate it. If you're connecting TS110A speakers to it, you shouldn't even touch that switch. 

Here's a helpful video to help you out and determine when or when not to use the HPF 80hz. I hope this helps!

Thanks for the prompt answer. This is very helpful.
I am using TS115A speakers with the subs.