Originally Posted by Tyrone Burton
Although I understand that 80hz is the correct setting for the crossovers with dedicated .1 channels, what about bass signals routed from a stereo signal such as music CD's, would that crossover still be correct?
Music or sound effect, the crossover only applies to 5.0 content as the 0.1 channel is unaffected.
What I seem to not be communicating is, the concept of localization and how this impacts content tracked to each separate speaker channel. The main concept behind managing bass over to the subwoofers is to take advantage of the capabilities of the subwoofer driver and the amplifier a subwoofer comes with, taking strain off of the puny, by comparison, AVR amplifier.
Home Theater or music CD, 5.1 Dolby Digital or Stereo, one is still going be dealing with localization issues when porting dedicated tracked information over to a subwoofer reproduction system. So yes, stereo CD's, localization issues are pertinent and a 80Hz crossover would still be a good choice.
I don't post "correct" because it depends on room acoustics and how a room's acoustics reacts to the moved around (from woofer to subwoofer) energy. The only way one can see what the "correct" or "best possible" setting is, is to fire up a room measuring system, measure the room's acoustic response and compare readings as yes, changing from 40Hz, to 60Hz to 80Hz, will change a reading from good to better or worse. A flat graph mime's what the sound engineer and producers intended so flat is the "correct" goal.
Some like to run bass hot but nobody gets to run up to the engineers booth and throw the slides up five or ten dB and at a concert, we head bang to what the control booth says we will and it's the same with playback. Once one goes outside the purvey of the recording engineer, the individual is spicing to tastes (salt and pepper away) and they're now "outside" the rails of "correct" and have moved into the the venue of subjectivity.
How are you expecting to use your subwoofer system? In my opinion, one needs to decide Music or Home Theater as mostly, music has a continuous bass track running in the background where as Home Theater uses a mix of music, dialogue and sound effects to convey the emotion of the video on the screen and the expectations of the two genres are completely and totally different.
Hypothetically speaking, if one were simply dealing with stereo music, I'd buy two subwoofers, place them next to each speaker, wire them in to the speakers and crank the system so issues of locatability are not a consideration. If using the LFE channel, one would need a third subwoofer so the first two subs would compliment the stereo track of the CD and the third subwoofer would compliment the LFE channel.
There is no Mother Nature. There's just a big bolder hanging over everybody's head as we all wait for the cord to break.
The point, the answer is always going be, "It depends." It will always depend on how far off in the weeds one wants to get regarding this type of subject matter.
If one wants quality stereo bass (no localization issues), one needs to wire two subs up to their speaker out connections; voila, stereo bass. If one want to light up the LFE channel and manage their bass, the crossover for the rest of the speaker channels need to be set to 60Hz or 80Hz to minimize localization issues. If one wants to know what's what with what at any time and point in their listening venue, they need to download and install a room measuring program, measure the room, place their subwoofer system according to what the room measuring program shows to be the best "choice" and go from there. If one wants to rock the joint, have everybody in the room hear quality bass, you're looking at a three or four subwoofer solution to smooth out the modes created in the room.
I need to add, speakers are no longer being made to "full range" specifications as was the case pre-1990 as Dolby-Digital and THX became all the rage. Now, it's expected that one will add subwoofers to their system so as to pick-up the "intentional" slack due to the current state of Home Theater speaker design. As an example, the Klipsch, Palladium series, surround speaker, at $2,000.00/ea.....frequency response specification: 72Hz - 24kHz, +/-3dB. As you can see, it's expected for the buyer to set their bass managed surround crossover to 60Hz when using these expensive (overly priced?) marvels.
In the case of a subwoofer system, less is not more. Bass is funny and a room doesn't come alive with bass until that third subwoofer is added to the system. At a certain point, it's not about playing it loud as it becomes about smoothing out the room's response to the subwoofer system. Once you get past all the madness, it really is quite simple.
Where are you wanting your system to go? What are the expectations you have of your subwoofer reproduction system?
Whip, chair, subwoofer........good luck.
At this point, the forum experts need to weigh in as I only qualify as an incompetent old fool