It works well and sounds great.

In my room, it only used 3 filters out of 60. That was before I installed the next part of my soffit system. I need to re-run.

I suggest you buy a copy of the AES paper to understand how they correct. They are not pulling down the peaks but rather correct the RT60 time of the below 250 Hz.

You can manually pull down peaks all you want. I have been playing around with that.

What I like most is the before and after graphs you can view. You can see both at the same time. You can also setup a number of different profiles.

You can create a profile with just you in the room. You can create one with guests in the room. (many bodies may change the results.)

If you have DSP speakers (6Ks and below), you are really going to want to the new speaker sofware.

The new layout of presets works well with 4.0. It might be me, but it feels like the time to change between presets (PL II to Trifield as an example) is shorter.

I have used the IA40 and IA00 to measure the room. I have never tried taking out the IA00.

The demo at HE this weekend in SF used almost all 60 filters because of the room. They had 7 DSP 8ks running for DVD-A, it was very cool!

Even if you don't use the room correction, 4.0 is just much better. It is hard to explain, you have to use it to understand.

The latest Meridian.exe is so much more relaible. I have yet to have it fail a transfer. Prior to that, it would fail 100% of the time when I wanted to store. I would always have to power cycle 861 and restart Meridian.exe before I could get past 50%. I use to keep a laptop running 98 just for this. (I have been running on NT for 10 years, I hate 9x based products.)

One of the cool things with 4.0 is that you can now get all of the LFE channel. If you have a mono sub setup and set the xover to 80 Hz, you would loose the LEF above 80 Hz. I believe this is a THX requirement. With V4, you can now get that back.

I believe Lexicon also does this, for now. All of the other THX boxes throw away the LFE above the xover point.

Stacey Spears
Co-Creator, Spears & Munsil High Definition Benchmark, Blu-ray Edition and Lighthouses of the Pacific Northwest.