"Bouncing" LFE signal (1 Viewer)

[Dean Sellers]

Help guys,
I'm running a Denon 3300 receiver to a Parts Express passive sub.
When I try to set the level on my sub, the spl "bounces" about 4db. It does it with the receiver's internal tones and with test discs.
I usually use a TOA commercial amp, and thought the problem was with an input signal voltage mis-match. I swapped the amp out with a receiver. Same problem.
Has anyone encountered this before? Is it my 3300?
Thanks Dean

 

[Wayne A. Pflughaupt]

Dean,

This is quite common with low frequency test signals, especially the pink noise most receivers use, and I assume your test disc. It’s because pink noise is random in nature (sine wave gives a more steady reading.) You can try switching your meter to slow response, or perhaps averaging the fluctuation.

Regards,
Wayne A. Pflughaupt