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#300677 - 04/06/10 11:11 PM Velodyne SMS-1 Sub Eq Results
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
Hey all,

Just got the SMS-1 yesterday from amazon and tonight I had a chance to play with it. It's really a fantastic tool for the money. It has made a big difference in my room. I never realized what I have been missing.

The bass in music is much more defined, even my wife noticed it. I can now hear the bass notes being plucked. Response is quick and tight. Everything is more even now.

The cool thing is it's all in real time, you can move the mic around the room, or the subs (I have 2 subs) and see in real time what effect each move/location has. Just press one button on the remote and you can hear with / without eq. There's so much more to dig into...I have only scratched the surface.

Below are the before and after pics, as you can see from the before pic, my room has some serious issues, peaks and dips galore. This was alot cheaper than room treatments and I don't think the wife would tolerate huge panels and bass traps in the main living room.

Once I eq'd each sub separately, I then eq'd them together. Then ran MCACC and did some final tweaks. So far I'm thrilled with the results.

Before:



After:


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#300696 - 04/07/10 05:06 AM Re: Velodyne SMS-1 Sub Eq Results [Re: Dduval]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10415
Loc: Calgary, Alberta
Very nice \:\)
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#300701 - 04/07/10 06:41 AM Re: Velodyne SMS-1 Sub Eq Results [Re: jakewash]
prototype3a Offline
veteran

Registered: 03/21/08
Posts: 110
Loc: Blacksburg, VA
WOW I've had my SMS-1 for a while now and I feel like an idiot for never thinking to move the mic around the room while it was sweeping to see what the response was at other locations.
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#300703 - 04/07/10 07:29 AM Re: Velodyne SMS-1 Sub Eq Results [Re: prototype3a]
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
 Originally Posted By: prototype3a
WOW I've had my SMS-1 for a while now and I feel like an idiot for never thinking to move the mic around the room while it was sweeping to see what the response was at other locations.


Yes, in my room (wood floors) it makes a difference. I had the mic at my main listening position, even when I stood up with the mic, I would get a little more bottom end around 30hz.

It was funny too, I looked like an idiot standing in the middle of my room with mic cranking some Robin Trower... \:\)
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#300723 - 04/07/10 12:13 PM Re: Velodyne SMS-1 Sub Eq Results [Re: Dduval]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8488
Loc: Tacoma
Very impressive!

Need video of the mic/Trower thing, though
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#300729 - 04/07/10 01:04 PM Re: Velodyne SMS-1 Sub Eq Results [Re: tomtuttle]
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
Thanks,

I always wanted some kind of sub eq. but when I was looking into it a few months back they seemed way too expensive.

Then recently I started looking at reviews and such on what was available and @ $354.00 for SMS-1 and comparing it to other models I think I made the right choice.

I was very close to getting the Anti-Mode 8033 for $350.00 since it has standing wave/time correction. But my Pioneer has that.

The reviews seemed really impressive on the Anti-Mode, just wasn't nearly as flexible and no on screen/real time display as well.

I give the SMS-1 a great recommendation for the price, but if you already have room treatments and/or a good acoustic friendly space, then you wouldn't really need one at all. In that case, any eq won't make a big enough difference to justify the money spent...IMHO.
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#300737 - 04/07/10 02:56 PM Re: Velodyne SMS-1 Sub Eq Results [Re: Dduval]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8488
Loc: Tacoma
Gee, that's a really good price. Didn't those used to be ~$600?
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#300748 - 04/07/10 04:20 PM Re: Velodyne SMS-1 Sub Eq Results [Re: tomtuttle]
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
Retails for $749.00, but online you can get them for way less, Amazon has them for $364.00 now, Vann's is 10 bucks cheaper but they are out of stock now...FYI
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#300750 - 04/07/10 04:42 PM Re: Velodyne SMS-1 Sub Eq Results [Re: Dduval]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 853
Loc: Toronto
Dduval,

I was looking over your results which look good, and thought I'd offer a suggestion. I see that you have boosted 3 of the filters 5-6db. Despite how it looks, boosting nulls is rarely beneficial and such large boosts can add ringing, and make for very uneven bass outside the sweet spot. You may get better overall results by restricting your boosts to no more than 3db. In other words you may get better sound across the room by giving up some linearity at the microphone placement.

Also I note that the EP350 rolls off at 28hz anechoic so boosting below at 20hz doesn't give you much output for the cost of additional harmonic distortion. An alternative would be to keep experimenting with placement to see where you can get more output in the low bass then equalize.

SMS is a terrific tool for the price, even though there are now newer products which supposedly address time domain (ringing) as well as frequency response.
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#300772 - 04/07/10 07:05 PM Re: Velodyne SMS-1 Sub Eq Results [Re: jakeman]
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
 Originally Posted By: jakeman
Dduval,

I was looking over your results which look good, and thought I'd offer a suggestion. I see that you have boosted 3 of the filters 5-6db. Despite how it looks, boosting nulls is rarely beneficial and such large boosts can add ringing, and make for very uneven bass outside the sweet spot. You may get better overall results by restricting your boosts to no more than 3db. In other words you may get better sound across the room by giving up some linearity at the microphone placement.

Also I note that the EP350 rolls off at 28hz anechoic so boosting below at 20hz doesn't give you much output for the cost of additional harmonic distortion. An alternative would be to keep experimenting with placement to see where you can get more output in the low bass then equalize.

SMS is a terrific tool for the price, even though there are now newer products which supposedly address time domain (ringing) as well as frequency response.


Yes John,

All your points above are correct. One of the "warnings" velodynes gives is to try to restrict boost to +3db on any fq. However, this mostly applies when you attempt "stacking" of fq. But again, you're right, going above 3db is not ideal at all.

After more experimenting, I did back down the 20hz boost to +2db for the exact reason you state. I was worried about forcing the sub amps beyond their capabilities on both my subs, PL-200 and the EP350, to prevent damage to the subs.

Tonight I am going to try to eliminate the boosting as much as I can. As you suggest, I need to move the subs around some.

I'll try to get some more results posted soon, so let me know what you think then.

This thing is so much fun, I can't stop "fiddling" with it \:\) .

Oh, one of the things I couldn't figure out is why it boosted 100hz so high when the xo is set at 80hz. Even when I backed it down, it didn't hurt the flatness of the curve much at all. Thank goodness this thing has full manual control.

Dana






Edited by Dduval (04/07/10 07:09 PM)
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