Receiver crossover slopes?

[engr_dave]

I'll post this in the DIY forum since it is a technical(?) question:

I'm trying to find out what the crossover slopes are on a Yamaha HTR-5890 receiver I purchased. The manual discusses setting frequency: 60, 80 (THX), 90, 100, 110, etc. but doesn't mention slopes.

I contacted Yamaha technical support and they didn't know :roll: .

I suppose I could measure it, but I was hoping that someone would know.

My Lexicon MC-12 specifies symmetrical 12dB/oct for the 80Hz THX setting and 24dB/oct for all others.

However, a previous thread started by kgveteran seems to imply that most manufacturers use asymmetrical slopes (12dB high pass and 24dB low pass).

Help! This will affect how I design speakers for my "Theater #2" system.

[Dennis H]

However, a previous thread started by kgveteran seems to imply that most manufacturers use asymmetrical slopes (12dB high pass and 24dB low pass).

That's the THX standard and most mfrs seem to follow it. It assumes you're using a sealed Q=.7 (Butterworth) enclosure at Fc. That said, I don't know what your Yamaha does. Can you measure it?

[soho54]

I have that reciever, and I want to say the 12/24 split is used in every setting not just the THX ones. Not 100%, but a good 90% though.

If you can't figure it out, let me know and I can run a few sweeps to find out for sure. My measurement gear should be up and running again in the next few days.