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hulkss

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  1. This is my favorite program for loudspeaker correction with FIR filters.
  2. The subwoofer line array consists of a central custom built Infinite Baffle sub with four 15" drivers from Acoustic Elegance. Flanking the IB on each side are two Epik Empire subs with two 15" opposed drivers in each of the four cabinets. In each corner is a Klipschorn bass horn. The system is all controlled with a HTPC connected to a MOTU 16A audio interface. The three horns in the photo are PSE-144's from Red Spade Audio. All three front main speakers are tri-amplified with digital crossovers in the HTPC.
  3. Here is some info on Neural Surround UpMix. I think it provides the best sound available for home theater and I've tried several. Neural Surround.pdf
  4. The software can be problematic. I loaded an update to Metaplugin a few months ago and it gave me trouble so I am holding at v3.4.3 for now. I'll try updating again when Jriver 27 is ready. Thanks for the VST3 heads up. Sadly, it's a rare audio mix that has the dynamic range to sound truly live and use the full potential of this system.
  5. Hi Mitch, I have a 7-meter-wide subwoofer line array consisting of one central Infinite Baffle (IB) Subwoofer, flanked by four Epik Empire subwoofers, and two Klipschorn corner-horns. Fourteen 15-inch drivers in all, driven with 5 amplified input channels: one for the IB, one for each K-Horn, and two channels for the two Epik pairs. The corner horns play L & R channel content above 80 Hz and are part of the subwoofer array below 80 Hz. Here is the Jriver DSP Set-up (all 64 bit processing with 24 bit, 48 kHz signals): DTS Neural UpMix is a VST3 Plug-in inside of DDMF Metaplugin64 v 3.4.3. That's what I could get to work properly. Next Jriver PEQ2 swaps side and rear surrounds, then into the Dirac plugin. I attached a list showing what makes up the somewhat confusing audio channels and then the Jriver DSP. The last image shows the Robert Bristow-Johnson (RBJ) parametric equalizer “bi-quad” filters from MSO that are in the last image of Jriver Parametric Equalizer DSP. As far as I know an unlimited number of filters can be entered into Jriver DSP.
  6. For the ultimate in two channel music playback I use the vst plug-in DTS Neural Surround UpMix. The wide sound stage and imaging is great for listening outside the small sweet spot of 2 channel stereo.
  7. Hi Mitch, Here's a couple pics of the room and my first quick try with Dirac playing and measuring through Jriver DSP. I had to switch the surround channel assignments into and out of Dirac and adjust the LFE test signal output level -10db to get correct results.
  8. Hi Mitch, I recently used the VST plug-in "Dirac Live 3 Multichannel" with "Jriver Media Center" as the host application. The output of Dirac goes into Jriver DSP where I have bass management, digital crossovers, and multi-subwoofer optimization filters (MSO software). I did a 9 measurement cube with an Earthworks M30 mic (8 corners plus center), set target responses as needed, and generated a filter set. This the BEST my system has ever sounded plus it's quick and easy (not counting the separate use of MSO and REW to generate my subwoofer line array filter set). Dirac Live Bass Control for optimizing multiple subwoofers is in the works and may be able to replace my use of MSO. I'm a bit skeptical as MSO is truly amazing in what it can achieve. Dirac Live Bass Control Illustration (just happens to be how my subs are arranged). No rear subs in my case.
  9. I have not sampled enough to really tell, I would guess over 50% have issues. Here's a really good mix: The Last Waltz by The Band Here's the Eagles Farewell 1 tour. A big dip in the average level around 80 Hz is caused by the channels not summing together properly. The individual channels look OK. There has to be significant coherent signal content across channels that is out of phase in that region.
  10. Yes, that's it exactly. Once I set a "house curve" for my audio system I don't want to be messing with it for correction of soundtracks. With BEQDesigner I can prepare and save correction filters. It is then possible to extract the audio, filter it, and remux it with the video. Now the source material is corrected and ready for playback with no EQ filters to mess with.
  11. This is not an EQ system. Yes, you can apply EQ many ways. It is a tool to provide insight into a soundtrack for analysis and review. The interesting part to me is the ability quickly preview the signal content of several gigabytes of mulit-channel audio data. This allows you to make an assessment of the sound track and do any corrections if desired. You can precisely design correction filters. Here's the soundtrack from the movie Bohemian Rhapsody. Poor integration of the LFE channel with the mains has left a big unnatural dip in the bass response at 40 hz. Knowing this allows for it to be "adjusted" if desired. This view is all channels combined into a mono signal intended for EQ of the subwoofer output (LFE + bass management). Individual channel analysis and correction is possible also if EQ prior to bass management is implemented.
  12. I built a home theater mainly to watch live music in the form of concert videos available on DVD & Blu-Ray, however, most recorded concerts have lame sounding bass. I have a very capable and well set-up audio system, so that is not the problem. I just found a software tool called Bass EQ Designer: BEQDesigner It can extract and condense the bass frequency response of an entire multi-channel soundtrack into a “signal” file for review & analysis. I gave it a try on a few of my MKV concert video files. This application is truly amazing. It enables you to design a corrective filter set to repair poor soundtracks during playback. I never thought there was much I could do with a poor soundtrack. To my surprise, many of these can be repaired, the problem seems to stem from poor post-production of the soundtrack, not bad music or bad recordings. Without BEQDesigner, I did not realize just how lame, but fixable, most recordings are. Let’s take a look. First, let’s look at a great recording that sounds fantastic. This is the bass signal content of Cream at Royal Albert Hall. Great electric bass and drums peaking down to 30 Hz. Note the flat and deep frequency content which sounds great. No problems. Now here’s a great concert of Alter Bridge at Wembley. What happened here? There is a -12 dB/oct roll-off in the bass starting near 100 Hz! No live rock band sounds like this by intention! Let’s fix it. I’m new at this but it’s easy and works great. I made a filter in the BEQDesigner filter tool. Then I applied the filter to the signal to see the effect. It looks promising. I entered the filter parameters into JRiver Media center for playback. That’s more like it, now we have a realistic sounding Rock Concert! Another great soundtrack: John Mayall’s 70th Birthday Concert. The sound was a little boomy in the upper bass. Here’s a look with a correction filter applied. Simple when you can see what you are doing. I’ll be reviewing my entire concert collection with BEQDesigner. No doubt, one of the biggest improvements I’ve made to the sound of my home theater. Have fun.
  13. Hear's a couple more Charts from REW measurements, SPL with Phase and Group Delay.
  14. Sure, I'll add a couple more charts in a post to the thread I started.
  15. I tried the new Dirac VST plug-in in JRiver. It could not connect to my ASIO microphone (MOTU audio interface). The help desk confirmed it is a bug in Dirac that they will fix in the future. Maybe multi-channel someday too. For now it's useless for me.
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