I bought a subwoofer last night and I'm working on adding it into my system (I was running 5.0 prior to this). I've read this whole thread and Batpig's guide (props to Batpig) so I'm pretty familiar with the setup and I ran Audyssey for the 5.0 setup with pleasing results. I went ahead and looked at the Audyssey thread to make sure I had a good understanding and felt pretty comfortable. After making the physical connections with the subwoofer (and making a few tweaks as far as speaker placement (adjusted toe-in on Front L&R), I went ahead and ran the Audyssey auto setup. However, I'm puzzled by the results.
I have a pretty hodge-podge system. Denon AVR-1910, Front L&R are Boston Acoustics A-150 (a floorstanding, 3-way speaker from the 80's with a 10" woofer-rated down to 36hz), a JBL EC25 Center (largest driver is 5", rated down to 80hz), and a pair of KLH Model 45 for surrounds (rated down to 90hz-extremely cheap but they get the job done for now). I just purchased an M&K MX-125 MarkII subwoofer to add into the mix (old, but I think I'll be enjoying it). The first results I got confused me, so I ran Audyssey again, but got similar results. It was late so I put this aside until the morning. I ran a single sweep of Audyssey several times to get the subwoofer channel level between -12dB and +12 dB, then I ran the full 6 sweeps. My Audyssey results are as follows:
All speakers set to small except subwoofer, which says yes.
Distances were all pretty spot-on.
Channel Level Check
Front L: -8,0dB
Front R: -8.0dB
Surround R: -7.0dB
Surround L: -7.0dB
Crossover Freq. Check
I've read enough here to know that I can't necessarily go by speakers stated freq response ratings, and that room acoustics, location from the wall, etc., can alter the frequency response of a speaker, but I was shocked to see that Audyssey set the crossover at 150hz for my fronts, which have a 10" woofer and are rated down to 36hz, while the crappy little surrounds were set at 110hz??? I was using a setup bluray for my system just a few days ago and ran some frequency sweeps. My Fronts gave good volume between 40hz and 50hz, and full volume between 50hz and 60hz. They were set to large at time (since I didn't have a subwoofer connected). I checked the fuses on the Bostons to make sure, but they were fine.
Stylez777 had a similar question a few pages back at post #4051, but his surrounds were all the same and were fairly small, and it was suggested he may simply want to raise the crossover for his rears to match the higher crossover set for his front L&R. This doesn't really apply to my situation.
Simply put, I think Audyssey isn't working correctly on my Denon. Does this raise a red flag for anyone else? Any suggestions?
More info on the Boston A-150s is below (pulled from a vintage audio website), and I've attached pictures of the Boston vs. the KLH.
Boston Acoustics A-150
- 3-way, Acoustic-Suspension design
-10" Low Frequency Driver (woofer)
-4.5" "Ferrofluid" Cooled Mid- Range in it's own, isolated enclosure to reduce dB robbing bass reflections
-1" Soft-dome, "Ferrofluid" Cooled Tweeter
Frequency Response: 36-25kHz @ +- 3dB
Efficiency: 90dB 1w @ 1m
Nominal Impedance: 8Ω each
Cross-over frequencies: at 550Hz & 3kHz
Nominal Impedance: 8Ω nominal / 6Ω minimum
Recommended Minimum Power amplifier rating: 15 watts minimum