Denon sub outputs are limited lower frequencies only. But there's another option. First, from page 192 of the Denon AVR-S950H instruction manual specific to subwoofer: "Set LFE signal playback range. Set this when you want to change the playback frequency (low pass filter point) of the subwoofer: 80 Hz/90 Hz/100 Hz/110 Hz/120 Hz/150 Hz/180 Hz/200 Hz/250 Hz(Default: 120 Hz)." As a new Denon AVR-S950H buyer, I may be informing you of what you may already know, but keep in mind the Denon's dual identical outputs (to allow two subwoofers to be used, as there is no difference between the two outputs) are pre-amp output only (without amplified power). The Denon receiver controls allow the output to be +/- 12db (to help balance efficiency (volume) differences between other speakers in your surround system), but as you will likely be using either amplified subwoofers, or a dedicated sub-woofer amplifier, the low pass filter points may also be adjustable there. But if you need full-frequency range output as I did using in my particular case using a dedicated subwoofer amplifier, my subwoofer amplifier allows me to feed the speaker OUTPUTS for my main left and right speakers coming off the Denon into my dedicated subwoofer's INPUT speaker terminals labeled "from amplified speaker outputs". My subwoofer amplifier then sends lower adjustable frequencies to a subwoofer, and those above (say 80 Hz and up) to outputs (as amplified from the Denon) on to my Left and Right speakers. I also own two brands of self-powered subwoofers which also allow both a pre-amplified signal input (again of only low-frequencies), but also feature a full-range input again using "from speaker output terminals" from another amplifier (like the Denon using its main Left and Right speaker outputs). Those full-range speaker inputs are then passed-through and output to terminals labeled "To Speakers Left and Right" with adjustable cut-off frequencies going to the subwoofer amplifier and allowing higher frequencies to pass through back to your main L&R speakers. The subwoofer amplifiers therefore power only the subwoofer frequencies. So your set-up (limited low frequency range or full-frequency range) is also dependent on how (and if) you have the option for full-frequency input via your speaker outputs on your amp into the subwoofer(s), or just a subwoofer interfacing with only a pre-amp signal at low-frequency range only. Are there other options and amplifiers allowing a full-frequency ouput (not just using a full-frequency tape output as an example), but still in sync / parameters with surround options / modes / controls and leveling? Not that I'm aware of near this price range with similar feature sets. And here I'm not so sure there's a audible hindrance of any magnitude in this full-range speaker terminal "loop" --- assuming your subwoofer amp or subwoofer amplified speaker allows that option. The designer probably considered and off-set issues at this under $5000 price-range. Am I pleased with the Denon? Absolutely. I have far more expensive equipment with metal knobs and thicker front plates (preamps, power amps, etc), but Denon has packaged it well and if you dig deep enough into some on-screen set-up features and use the full instruction manual (which you download free), you can see the user-interface is a step-up from other similar $550-$1200) competition. Having purchased higher-end gear over the past 45 years --- I was in the consumer electronics business (not with Denon or its past or current parent company) for more than 35 years with several highly regarded consumer and commercial AV manufacturers, and I'm a former CEA Audio Standards Setting techical member. This product is a very nice one, and its Product Planning Managers and Engineering team did a solid job. The cardboard stand included for the packaged mic for automated set-up was an inexpensive (paper cost) but still a clever and functional design. Somebody was thinking things through for a wide variety of Denon buyers owning a wide variety of equipment.