Here’s my issue, I just moved to a new home and reconnected everything the way that it should be and now it’s looking like something malfunctioned. I'm unable to get audio from my Outlaw 755 amplifier.

Here’s what I own:
Integra DTR 7.3 Receiver
Outlaw ICBM
Outlaw 755

I’m told that I should use a scope to test the pre-amp outputs from the Integra DTR 7.3. Is there an easy way to do this without a scope? Btw, I made sure that multichannel is set to yes and I bypassed the ICBM during my troubleshooting and I also made sure that the speaker wire and speaker operates using another receiver. The Integra functions if I use the speaker terminals instead of the preamp outputs.

Is there a safe method to test the Outlaw 755 without a pre-amp?

Thanks!