I'm not sure I understand your setup, but I'd guess you want to defeat the crossover at your sub and rely only on the 80 Hz of your AVR. Before I had KEF 107/2s which do have substantial LF extension, I used a pair of 104/2s which roll-off below about 50 Hz so do need to be supplemented by a sub. Buy a Radio Shack SPL meter, and use that to set the LR and sub levels equal. You can use the AIX Records audio calibration disc as a source or if your AVR generates white or pink noise for this purpose you might use that.
Set all the speaker sizes to LARGE and set subwoofer to NO that way the AVR routes the full signal to the speakers and none to the sub.
OP's KEF 104/2 speakers need to be supplement by a sub for LF extension. If Op uses an 80 Hz crossover and equal levels to all speakers, the transition to the sub should be imperceptible.
i suggest NOT going through inferior sub cross, and simply go full range direct for stereo, and maybe run sub from parallel speaker connections for music duties. then, id run sub line level n crossed over from Yamie processor for movies, also crossing over mains from processor setting in yamie to match for movie applications! keeping sonic midrange n treble purity is key, and then necessary processor internal EQ for the MORE demanding dynamic ht duties, is critical,
Db I hear good results setting the sub up as you suggest playing music... very pleased with dropping the kube 2000 out..
Avgoround... The problem is the flexibility in connecting the sub . I prioritize two channel music. so the amp takes balanced outputs from the pre and the sub gets the full range pre amp out put to the single ended LR inputs of the sub and cross over as Db suggested.
When I run the Home theatre... I use the same single ended pre amp outs to the sub... set the sub cross over and high pass output to 80 and flip the amp to uses single ended inputs now coming from the sub. its a bit congested but it is a movie..
Everything I read about the sub warns you about using both the high level speaker inputs and the low level single ended inputs. I don't see how I can avoid this setup. The only sub that seems to be able to set up using both inputs are the Rel brand which appears to let you toggle between the two kinds of inputs.
Historically, crossovers built into powered subwoofers have been anything but sonically pure regarding passing midrange/high frequency signals!..degrading overall sound quality to the monitors. Thus, bass is least of my concern in 2 channel music, and keeping the purity of the delicate mid and upper registers is paramount, and i'd default to running speaker level through a switcher top the powered sub, and defeat that for movie playback, if it where me. Again, I would venture that any AB comparison for sonic purity of mid/hi, going both through the sub woofer crossover, and without it, would easily be a discernable advantage,if you NIXED the sub's mid/hi-pass crossover in the mix!!
Nope, seriously doubting that's the best route, IMO
See here in lies one of the problems, in that you're attempting to do a dual purpose system, and you want convenience, and the sonic advantage of a dedicated outboard 2 channel pre plus outboard AV processor working in the same system - which you will have to switch the later in and out of the system anyway. It's a compromise of convenience to isolate the better 2 channel pre-amp for music duties in the setup. This causes a dilema in how one chooses to deal with how the powered subwoofer is to be used in both systems simultaneously, and remain effective for both. And, I find, you either often end up compromising the perfectly flexible and integrated subwoofer transition while swicthing between the two systems, or you maintain the best integration of mid/hi freq sonic purity whilest switching between them, and maybe have a not so convenient subwoofer conversion between the systems! Neither is likely ideal, and has it's pro's and con's in an ideal world.
If HT was my priority, I'd be likely nixing the seaparate 2 channel analog pre amp all together, and simply go with a high end digital AV prepro, and just process my music internally in the DAC's in the pre, with all digital connections, and analog converted or passed direct when you do tuner, turntable, etc. There are a number of them out there, that still sound superb for most people's tastes and applications, such as in a custom integration setup.
If music is your priority (such as yours), I'm probably doing what I suggested, and simply throw a speaker level switcher to switch in and out of the way for the subwoofer in parallel connection for music, and going straight out of the analog 2 ch preamp for music, running the sats full range. (the line level is disconnected when the AV pre/pro is turned off and not in use). Then, when it's movie time- and the AV pre is on and looped in to the 2 ch analog pre - you simply are using the internal digital 80hz crossover to all channels, and the subwoofer is filling in the bottom from the LFE output of your processor -and simply switch the speaker level out of the way from the switcher! Seems pretty straight foreward to me.
Again, this way, I get pure sonics to my sats for full range music, and get to add bass run in paralell. No other crossovers will do anything but degrade my signal purity that im asking out of my expensive analog 2 ch pre, otherwise.
But hey, that's me
HA... talk about my blind spots.... Thanks for pointing this one out...
Once upon a time... I read that using the speaker level inputs to a sub was the worst possible way to feed them. I thought of the speaker level terminals as a relic from the distant past... Consequently... I never thought of the AV solution using the speaker level inputs at all ....much less in this way.
You are absolutely right... by using the HT bass processing and the LFE output of the AV receiver for movies... I should get rid of the congestion I hear right now in the movie soundtracks....
I found this box
Tabletop A/B selector
which has a max power spec of 150w RMS... The power handling should be fine (Its a 200 W amp)... This box will disconnect the sub speaker level inputs... then the AV receiver does the LFE thing as designed for movies... or any 2.1 listenting I want to do with the AV reciever... stupid simple.... ssshhh.
I will let you know how the theater sounds.
Thanks for the new way of looking at it.
One final question.... I have two crossovers in play now... the AV processor is set at 80 HZ... The sub cross over is set for 80 Hz using the speaker level inputs for music as DB recommended and I concur.. ... (No high pass cross over used)
Is there any problem with this set up of the two cross overs?
Normally... I would turn the sub cross over off... ie 200 Hz. Am I supposed to raise the HT Receiver cross over to something higher when the sub cross over is set for 80hz?
Hopefully the Sub volume level that works for the speaker level inputs and music will also work for the HT receiver and the LFE line level input channel.
Well just remember, you're not really using 200 watts of current at the box, since you're really only "taking a signal" off the wires at the sub!..not powering the sub with speaker wire connections. So, I don't believe you're actually drawing current there.
And I would 100% state that using speaker level subwofer connections is 100% better for simply bass signals to the sub, than it is using speaker level connections through the subwoofers internal highpass crossover, and out to the satalite speakers, driven that way!!!! Same can be said for line level connections to the sub, filtering out to the sats, as well.
Just never heard one setup where the sound from the mains was anything special going through the likely cheap crossover parts thrown into a powered subwoofer, as an "after thought". Wouldn't do it..
I like my earlier suggestions, yes.
Hope it works out for you
yes, typically, if your using two crossovers in a subwoofer's path, usually, you turn the later all the way up and out of the way. The one in front gets set to the 80hz. So, connected to the AV pre, you set the pre to 80hz, and sub to 200hz, and so forth. With parallel speaker level connection, however, id run full range from analog pre amp and then set sub cross at wherever main speakers naturally roll off, usually...otherwise, set to 80hz if filtering mid/highs as you first suggested you connected things.
Main thing is really not to set two crossovers in the same path at same location!! Weird phase issues can happen. That's the main issue. So one you will need to set high, and the other about where you want it set, in this case, the discussed 80hz location, and you shouldn't run into any problems associated with two crossovers in front of one another.
Does it make any difference if I switch the low level line inputs..... eg HT Amp LFE output with the Preamp out .... going into a switch and the selected output going to the sub LR line level iputs.
Or...is there some advantage to using the speaker level inputs.
(I can't think of a reason)
Sorry im confused. Do you mean Line level swich being fed both from the AV pre's LFE out put and also from a pair of line level out's of a 2 channel pre into the sub (switcher switching between the two differnt sources - or preamp/processors?), or do you mean other?
Of course, you could play with all of the above, and see what works, but I mean simply a speaker level switcher for simply taking the parallel speaker level connection out of the way when you're doing AV pre/pro in the system for movies, so that the sub isn't seeing both the line level and the speaker level to the sub at same time!
Are we on same page, or am I not understanding the question? a