What does the Room Correction do on the SR-8100

[witalik]

Hello guys,

Owning a Sherbourn SR-8100 here in the Netherlands because i needed the slim design to fit in our tv cabinet. The other day i was playing around with the Umik-1 system to measure some subwoofer positions. I also tried to measure what the Room correction does in this unit. First i measured with the correction on and after that i turned the correction off by setting the EQ to flat. Below is the result :




It doesnt do alot is what i find. Maybe for the higher frequencies because it seems the souns is tiny bit cripser. I also did a new measurement and again nothing really changed. But what does the room correction on this unit do ?

Is it just leveling all the speakers volume ?
Does it do something with timing ?



I had a Marantz SR5006 in here few weeks ago, made the 6 spot measurement and i didnt believe what i heard. It sounded like i had a new subwoofer, it came alive !

[witalik]

Anyone ?

[unsound]

It should do a lot more, especially in the lower frequencies. I recommend, though, that you use REW and PEQ instead of the in-built room correction.

[witalik]

But then I need some extra hardware right ? This minidsp for home theater cost 500 dollars in the US and then it needs to be shipped to Europe. But does anyone else have the possibility to test this ? Its pretty easy to switch from flat to Auto correction.Was hoping this ARC in the sherbourn could do something.

Because looking at this graph it seems to do nothing in the lower frequencies ?

[unsound]

No, you already have the Umik and your computer - you shouldn't need anything more than that. You will need REW software, but that is free. You can have REW spit out the PEQ settings for UMC-200 and apply them to your 8100. If you look up UMC 200 and REW or Fusion 8100 and REW, I'm sure you bound to find a lot of good information.

[witalik]

I got the REW software, but I think where you are going with this. I should use the UMC-200 option then and manually insert the values the REW software spits out ?

I must say, I never noticed the UMC-200 there :-) This is something that I could work with. But do you think this would make much better results than de ARC of the sherbourn itself ?

Thanks for the info.

[unsound]

Yes, that's exactly what I'm suggesting. Yes, this should get better results than the Sherbourn ARC. But, you can see for yourself which one is better.
You will, however, have to make sure you set distances correctly, especially for the sub. Also, see what happens after you set your crossover point. I would also recommend focusing on the 20-200 or 300 Hz range.

[witalik]

Yes , that's the kind of frequencies I want to enhance/Equalize. Great heads up there for that filter. btw I hope I can get this asio4all to work , installed it last time but couldn't select it.

One site suggests this for measuring, sounds like XT32 with multiple points to measure. I like the idea because when I made some measurements with the SR5006 I had for a week with multiEQ the sound from the sub combined with the fronts were very good, I had to turn down my gain on the sub because it came alive.

Measure speaker response

Set RTA > Averages > forever

Hold the mic with the tip pointing up or down at the main listening position at ear height. Click "Reset averaging" and start moving the mic slowly through the listening area at a speed not faster than about 15cm (0.5ft) per second. Try to cover as many points within the listening area as possible. After about 60 averages click save.


Edit:

I wonder if the distance shown in the speaker setup is the delay of the speaker or the distance in raw data? So if the sherbourn measure it is 15 ft and the real distance is 10 ft what is the wise thing to put it on ? the sub is set on 25ft while it is almost the same distance as the left front speaker.

[millst]

Did you compare one position or multiple positions? If you performed auto-EQ on multiple positions, then it's going to try to apply correction for all of them. That limits what corrections can be applied since the response will be different at each position.

It's hard to tell since you only showed the bass response and didn't mention smoothing. It may have provided more EQ in the mids/highs.

It looks like you have a few deep nulls. Those might be room modes that the EQ isn't going to touch. I'd imagine the auto-EQ is very basic and it's not going to apply much (if any) boosting for fear of driving your subwoofer too hard. You can likely do better with REW, but it will take time. Home Theater Shack forums is a great resource for everything REW.

I would trust the distance/delay set by the auto EQ so long as other channel numbers don't seem crazy. It's not uncommon for the subwoofer distance to be set to something different than its real world distance due to delays introduced by the sub signal chain.

-tm

[witalik]

Hi,

With this auto-EQ just 1 position is measured, the graph has no smoothing and higher up the range its not doing much either. Its not doing anything, it kind of fixes one at 100 hz but it gives a null back at 150 hz

I have been playing around with the rew measurement. Its not working flawless with ASIO4ALL, I got 5 subwoofer channels it seems. Left front does give normal sweep, the rest exepct those subwoofer channels are also crackling ? So somethings not really like it should.

The distances are somewhat the same, for the fronts and surrounds so i'll leave those as they are.