Originally Posted by MIIKE888
I have a couple of questions hope somebody can help me.
I bought two subwoofers 1 month ago and and hooked it to the oppo-105
i ordered 1 specialy made cable made by supra cables 1rca to 2rca because the oppo only have one sub out.
my questions are.
1. i have set all speakers to small in the oppo and stereo signal front left/right and the crossover to 80hz(subs crossover is in the bottom 150hz)
but i can`t hear any difference at all when i change the crossover in the oppo from 40hz to 200hz :/ i have never experienced this when i used other preamps.
is there a setting i have missed?
2.when i change the stereo front left/right to downmix stereo the sound gets much louder in the whole frequency range not only in the bass.
also why is that?
3. if i have the subs amplifier volume set to 50 of 100 and have to set the oppos sub output to +5db to get even balanced sound is it better if i turn up the subs volume to maybe 60 and down the oppo to +-0db for any reason?
4.and finally if i have the XLR ouputs at -6db does it mean that if i go to volume 100 on the oppo i wont get full available volume output?
this is just something ive been wondering i dont think i go to 100 anyway
Thanks in advance!
1) This is probably a configuration error in your subs, but start by checking the basics. Put the OPPO Crossover back to 80 and the Stereo Signal Setting to FRONT LEFT/RIGHT. I'm assuming you have the Dedicated L/R Analog outs wired INSTEAD OF the Left Front / Right Front outs of the multi-channel Analog set.
Confirm that DTS Neo:6 Mode is set to OFF.
Now use the built-in Test Tones in the OPPO to confirm your wiring and double-check your speaker levels. Confirm that sound is coming from the correct speakers and the subs in turn and that the volume levels are reasonably matched.
IMPORTANT NOTE: You can't use the player's built-in Test Tones to check the Crossover function. The Test Tones do not go through the Crossover.
Instead play a wide frequency calibration tone from a calibration disc into the front speakers or play a piece of MONO OR STEREO music (i.e., not multi-channel music as it may already have Sub content in its LFE channel) with good bass component to it and get used to how that sounds. Touch your hand to the front grill of the Sub to confirm it is producing bass output. Now disconnect the Sub output from the OPPO. The test piece should sound as if bass has been lost. Now change the Crossover between 40Hz and 200Hz. You should notice much more loss of low frequencies (since the Sub is still disconnected) at 200Hz. Plug the Sub output back in and unplug the main speaker outputs or turn off their amp. Again compare 40Hz to 200Hz. There should be more content going to the Sub at 200Hz. If you've got these results then the Crossover is working.
As to the Subs themselves, make sure you have the built in Crossover in the Subs either bypassed or turned up to the highest frequency to get it out of the way as much as possible. The Subs may have a separate setting to protect them from frequencies that are too low -- typically set around 25Hz. Don't confuse these two settings.
With two Subs you need to make sure the Subs are in proper Phase with each other as well as with the main speakers (usually using Left Front as the surrogate for the set of main speakers). If the Subs are out of Phase their output can cancel. There's a whole forum here on Subs were you can find help on configuring Subs and adjusting bass response in your listening room.
2) When you switch the Stereo Signal setting to DOWN-MIXED STEREO all of the multi-channel content is now coming out of Left Front and Right Front (again assuming you have wired the Dedicated L/R outs for that). But it is ALSO still coming out of your other speakers! So the volume goes up.
3) Yes, in general it is best to not use speaker volume trims above 0dB. For the subs you have the easy fix of turning up the volume on the Sub so that you can use a 0dB Sub trim in the OPPO.
4) Yes, but if you are mixing XLR and RCA outs you need to balance the inherent level difference between them. It is better to lower the XLR as you have done than to boost the RCA trims above 0dB.