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Re: db difference of LFE vs sub hooked via main

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SamM

(i)

In Reply to: db difference of LFE vs sub hooked via main posted by magman on May 08, 2001 at 16:30:48:

The reason it does not rattle is because the LFE channel (which stands for Low Frequency Effects) is the ONLY channel used for sub-sonic felt effects. Cranking your sub will just cause it to be overdriven and will not have even close to the same effect as using the LFE channel. The LFE channel is designed primarily for those jar to the bone effects when viewing DTS or DD. Not using the LFE, yet having a subwoofer connected to the main speakers does not have the same effect. setting the 5.1 to no sub will automatically defeat any LFE. one thought could be to set the sub to yes and have the x-over set to the minimum it will go, this MAY still send some LFE to the L/R channel if the x-over goes low enough.
i still don't quite understand your wiring.... could you elaborate on the use of the sub in your system?
-Sam

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Re: db difference of LFE vs sub hooked via main magman 15:50:23 05/14/01 (2)
My setup is:
```
  
        DVD             CD 
         |               |  
      Pre/Proc          DAC 
       | |(Front)        | 
 (Rear)| +---------------+ 
       |            | 
      Amp        2ch-preamp 
       |            | 
   Rear spkr      Xover 
                +---+---+ 
                |       | 
              SubAmp   Amp 
                |       | 
               Sub   Front Spkr 
  
```
When I play CD's I adjust the volume via my 2ch amp.
When I play DVD's I set the 2ch amp at 12 o'clock position and do the controls via the pre/proc
For DVD-A, haven't decided how to do it(since I don't have 5.1 direct on my pre/proc.)
This is the only way to hook 2 systems up.

I am keeping my 2ch preamp because it is of superior quality to the pre/proc.
- Re: db difference of LFE vs sub hooked via main Sam M 02:18:27 05/27/01 (1)
  Sorry, i've been away from my computer for a while....
  Hey, i just thought you could device an A/B type switch that would allow for your set-up as is when you listen to music and switch when you want to play a dvd....
  So, the 1st input would come from the Pre/Proc's LFE channel and the 2nd input would come from the Xover as you have it now.... the ouput from this switch would be going into the sub. The beauty of this is that by by-passing the xover with this switch during DVD playback you would not sacrifice quality because the appropriate range of freqs would be sent to the front channels already! just a matter of getting it made or making such a switch yourself.... if there ain't one out there already
  It would be a simple switch box with 2 RCA ins and 1 out!
  what do you think?
  -Sam
  - Re: db difference of LFE vs sub hooked via main magman 18:23:27 05/27/01 (0)
    I don't think this would work, since the current setup, the 2ch preamp goes to the sub, which then sent the higher freq to the main speakers's power amp & to the speakers. If switched to the HT setting, the main fronts would still be hooked to the sub.
    If it was to work, it would be a A/B switch that simultaniously did a whole bunch of switching like:
    In A setting:
    LFE pre out to sub amp
    Front pre out to Front Amp
    In B setting
    Pre out to sub amp
    Sub high pass to front amp
Sub=NO, typically re-routes LFE to mains bstan 13:49:19 05/12/01 (3)
Sam,
I believe the typical operation of most HT processors routes LFE bass to the L&R main speakers if they are specified as Large and Sub=NO is specified.
Do you have any specific examples where this is not the case?
- Re: Sub=NO, typically re-routes LFE to mains Sam M 02:06:31 05/27/01 (0)
  Yes, the standard DD setup allows for sub=no or LFE = no, but doing so i have never been able to achieve the rumble out of the main speakers that you achieve by sending the LFE directly to a sub. I have had the same experience with 3 different DD/DTS receivers is have had. I believe that what i happening is that when the sub is set to 'no' then the dynamic range may be compressed to not allow the ultra-lows to be sent to the 'large' speakers.... don't know this for a fact, just my own observations. has anyone here been able to reproduce the rumble with the sub set to no?
  -Sam
- Re: Sub=NO, typically re-routes LFE to mains magman 15:20:54 05/14/01 (1)
  My Toshiba 9200's DVD player's internal AC-3 decoder to its own 5.1 output does not reroute LFE.
  And from what heard, the Acurus ACT3 w/advanced bass managemnt does not do t on DTS either, but it does w/o the adv bass mgmnt
  - Re: Sub=NO, typically re-routes LFE to mains bstan 11:42:48 05/15/01 (0)
    I did say typically, which means there will be some who didn't take the time or care to implement this feature in the software.
    Even my extremely inexpensive Technics SH500 DD/DTS processor re-routes LFE.

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