Originally Posted by rankinc
I recently purchased a Yamaha RX-A2080 and in the instructions for using YPAO, it says "Turn on the subwoofer and set the volume to half. If the crossover frequency is adjustable, set it to maximum." (page 55: https://usa.yamaha.com/files/downloa...BGLF_En_D0.pdf
I am curious why this is? I have a Boston PV1000 subwoofer and it has dials as shown in the attached picture. The crossover can be adjusted from 50 - 150 Hz. It was set to the middle position from its original installation long ago. What is the impact of turning to max?
The LFE channel can contain frequencies up to 250Hz (well, technically it can contain any frequency, the channel is a full bandwidth digital channel), but the specification says it *should* only contain material up to 250Hz. In practice, most masters have frequencies up to 120Hz. So, if you set a crossover on your subwoofer lower than 120Hz, some of the output at higher frequencies will be attenuated and you will miss some of what is on the master.
Subwoofers typically have one or two full range inputs were the crossover will take effect, and most of the time also have an LFE input where the crossover will have no effect. When connecting to an LFE output you don't want the subwoofer's crossover affecting the signal, and thus why the manual recommends setting the subwoofer's crossover to maximum.
Main: Marantz AV8805, 5x Behringer NX4-6000, Epson 6050UB, Stewart Greyhawk 120", LG C8 65", DISH H3, Panasonic UB820, ATV4k, FTV4k, 7.2.6+2: DefTech BP2000, CLR2000, Di 5.5BPS, UIW BPZ/A, Di 8R, M&K MX-125. Bedroom: Yamaha RX-A3070, LG E8 55", DISH 4k Joey, FTV4k, 5.1.4: DT RCS II, RSS II, IW Sub Ref. Basement: Yamaha RX-A3040, 3x Marantz MA700U, Panasonic PT-AE8000U, Panasonic P65VT50, 6.1: DT BP2000, CLR2000, Di 6.5R