LFE in a stereo downmix

[dasdoing]

Unfortunatly I don't watch movies very often atm. Can't realy find intrest in majority what is beeing produced atm.
I tested with the latest 007, tough.

crazy. I didn't even watch a single movie after this in over 2 years.
I guess I should find me a movie for next weekend.

 

[JoostE]

Grave digging this topic once again.

This has been eye opening for me. I have 2 very large stereo speakers, in which in use a minidsp SHD to x-over, but movies always missed the "oomph" so to speak.

After reading this topic I think I know what happens. The LFE is not send to my minidsp at all, or with a 10dB lower volume.

Setup:
1. Netflix app
2. LG OLED G4
3. Audio settings on TV at PCM stereo
4. MiniDSP SHD
5. AMPs
6. Speakers

So my TV is doing the downmixing right now. And while the TV has very good image, I don't trust their audio handling all that much.

My question to you guys, is there some kind of downmix device that I can use to put HDMI multichannel audio in, and a digital 2.0 PCM out (preferably optic cable)? I doesn't need an amp or a DAC, so an AVR seems extreme overkill.

 

[bungle]

For full-bandwidth signals, -3dB is usually used to compensate for that (which you see as the 0.707 for the centre signal there). Two non-coherent sources sum as +3dB. (Although, come to look at it, not sure why he's done -3dB for the surrounds.)

What would you recommend to surrounds then? If say in 7.1 you redirect L surround to L and R surround to R and perhaps L Back to L and R Back to R. Do you suggest some other values in this case, I am referring to "not sure why he's done -3dB for the surrounds".

I am wondering what is the best way to setup this with MiniDSP HTx. I currently have (Dirac-1 being left output and Dirac-2 being right output), and I don't use bass management in this 2.0 setup (just routing and levels):

Note the LFE being +10 (to get even), and then reducing -4db because of summation. I could have 4 there instead or 6, but the thread suggest that value could be between 4-7 db for LFE, if I understood right (i may need to play around it a bit, though couple of dbs shouldn't matter too much, especially for such effects channel, I expect my mains to go cleanly around 35hz, and within the room perhaps a bit lower, I haven't measured it yet).

 

[edechamps]

If you're going to do something like this, make sure to lowpass the LFE channel at 120 Hz first. There is content out there with accidental high-frequency garbage in the LFE channel, which most people won't notice because their system (including the producer's system) will lowpass such garbage, but yours won't.

 

[bungle]

If you're going to do something like this, make sure to lowpass the LFE channel at 120 Hz first. There is content out there with accidental high-frequency garbage in the LFE channel, which most people won't notice because their system (including the producer's system) will lowpass such garbage, but yours won't.

Thanks. A great thing about minidsp is that you can do such change in a couple of seconds. Do you in general rather advice against, e.g. better to drop LFE instead? What about other channels?

 

[KxDx]

Grave digging this topic once again.

This has been eye opening for me. I have 2 very large stereo speakers, in which in use a minidsp SHD to x-over, but movies always missed the "oomph" so to speak.

After reading this topic I think I know what happens. The LFE is not send to my minidsp at all, or with a 10dB lower volume.

Setup:
1. Netflix app
2. LG OLED G4
3. Audio settings on TV at PCM stereo
4. MiniDSP SHD
5. AMPs
6. Speakers

So my TV is doing the downmixing right now. And while the TV has very good image, I don't trust their audio handling all that much.

My question to you guys, is there some kind of downmix device that I can use to put HDMI multichannel audio in, and a digital 2.0 PCM out (preferably optic cable)? I doesn't need an amp or a DAC, so an AVR seems extreme overkill.

I know is been over a year, but I use a device like this, and it has worked very well.

18Gbps HDMI 8-Channel Audio Downmixer

This 4K UHD HDMI with Dolby Atmos™ and DTS-HD® Stereo Audio Downmixer supports the transmission of high bandwidth (18Gbps) video through HDMI, and allows the associated audio signal to be simultaneously extracted and split to both digital and analog audio outputs, providing high quality audio...

www.avproglobal.com

They are pricey brand new (>1000 dollars) , but can be found used on ebay for a reasonable price fairly often.