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Testing the DSpeaker Anti-Mode 8033

Discuss Testing the DSpeaker Anti-Mode 8033 in the Equalization | Calibration forum; Testing the DSpeaker Anti-Mode 8033 Testing the DSpeaker Anti-Mode 8033 The DSpeaker Anti-Mode 8033 is an automatic subwoofer EQ device, it aims to simplify the ...


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Old 06-21-08, 06:09 PM   #1
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Testing the DSpeaker Anti-Mode 8033


Testing the DSpeaker Anti-Mode 8033

The DSpeaker Anti-Mode 8033 is an automatic subwoofer EQ device, it aims to simplify the process of equalising a subwoofer whilst employing advanced algorithms to generate precise filters to counter room modes. It is supplied complete with a measurement microphone. Given my long-standing interest in EQ I bought one to see how well it performs.

The device is very compact, just 126 mm x 80 mm x 28 mm. It has a separate “wall wart” power supply. The front panel has a 3.5mm connector for the measurement microphone; 2 buttons to activate the EQ process, bypass the device or select two bass boost profiles, “Lift 25” and “Lift 35”; and the on/off switch.



The rear panel has a power input, an RCA connector for the sub output from your AV procesor and two RCA connectors for the output to your subwoofer, one of which is inverted (equivalent to setting your sub's phase control to 180 degrees). Usually only one output would be used, though both could be used to drive a passive sub in a bridged configuration with a stereo amp.



The 8033 is for use with subwoofers only. It operates at a 4kHz sampling rate and has a frequency response that is -3dB at 3.3Hz and 100Hz. The response is only relevant when the device is in bypass mode, as it internally applies EQ to give a flat response when it is active. The graph below shows the bypass response.



The processing delay through the unit is 2.7ms, equivalent to 0.9m or 3 feet on a processor's distance setting. Note that the unit has 3dB of gain (the output level is about 1.5 times the input level) even in its bypass mode, remember to recalibrate your sub level after inserting it. THD when fed a 0.5Vrms 40Hz test tone was well below 0.1%.

Operating the unit is very simple. Just connect it up, plug in the microphone and place the mic in your listening position, then press and hold the 2 buttons for a few seconds to start the EQ process. The unit begins with a few seconds of adjusting the level for the mic then starts its sweeps. There are 4 sweeps in total, each lasting 1 minute. Once the sweeps have completed the job is done. It does allow multiple measurements to be taken in addition to the primary position, and according to the manual combine the measurements to deliver EQ that works over a wider area than from a single measurement, though I didn't test that.

I tried the unit out in my lounge, feeding an REL Stadium II sub in one corner of the room, which gets down to about 20Hz in-room. This was the first time I'd measured the sub in there since the room was extensively rearranged. I compared the results of the 8033 with those I got using a BFD (DSP1124P) applying manual EQ. The room itself is L-shaped, with patio doors right across one end.

Here are the results with no EQ (red), the 8033 (green) and then the BFD (blue). Graph axes are from 35dB to 95dB vertically and 15Hz to 200Hz horizontally.



The 8033 has nicely levelled out the two areas of major resonance.

Here are the spectral decay plots for each case, first no EQ, then the 8033, then the BFD.







Finally the waterfalls, no EQ (red), the 8033 (green) and then the BFD (blue).







The 8033 does a reasonable job overall, though I had hoped for a little better. In fairness, this is a very difficult room to deal with. The L shape combined with the effect of the patio doors in one wall and a large window on the wall opposite result in two clusters of closely spaced modes spanning about 23 – 31Hz and 52 – 65Hz. To get the results in the manually applied BFD EQ I spent about 3 hours tweaking, remeasuring and re-tweaking the settings, using all 12 filters and the benefit of many years investigating EQ for subwoofers. I applied no filters above 65Hz as there were none left in the channel I used, although another 12 can be had by looping through the other channel I'd kind of had enough by then . To get the 8033 results I pushed two buttons and made a cup of tea. I would expect that in a more conventionally shaped room it would perform even better.

The 8033 worked well and is very easy to use. I would still strongly recommend that anyone wanting the best from their subwoofer spend some time measuring its performance in the room and seeing the effects of changing its position and/or where you sit, as devices like the 8033 or the BFD can only really help with countering the boost from resonances, they cannot correct the dips that all too often occur at certain positions. Having done that though, the 8033 offers an easy way to get the modal EQ aspects covered.


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Old 06-21-08, 06:47 PM   #2
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Re: Testing the DSpeaker Anti-Mode 8033


For the sake of completeness, here are the filter settings for the BFD:



Note that it took 7 filters to correct the 20 - 35Hz region, and in that area a change in filter frequency of less than 0.5Hz can be the difference between working and not working.


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Old 06-21-08, 07:16 PM   #3
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Re: Testing the DSpeaker Anti-Mode 8033


Good review John.

I see that the 8033B is 225.00 €, which is about US$350. Not a bad price for something so automatic. I guess with the BFD, you're paid to do all the messing around.

The response is quite good, especially at the bottom end. It seems a lot of sub devices forget that many want that low end extension. I see the 25Hz switch lifts from 15Hz-25Hz and activates a digital filter for frequencies below 10Hz. That's a useful feature for the DIY guys.

I also like the input level warning, that flashes one LED at -3dB and then another at 0dB max. Then it has an anti clipper.....

It has 24 distinct anti-modal filters, so I doubt it would run out.

brucek


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Old 06-21-08, 07:56 PM   #4
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Re: Testing the DSpeaker Anti-Mode 8033


Fantastic job John. Your time spent on the testing now justifies my purchase of the 8033. The one advantage that I like about the 8033 is that you can run more than one sub with the unit. I have four subs and have had no problmes with the bass.

Thank you, Bill


Last edited by bsoko2; 06-21-08 at 08:12 PM..

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Old 06-22-08, 06:33 PM   #5
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Re: Testing the DSpeaker Anti-Mode 8033



All it all it seems like a pretty impressive device. Way simpler than the Velo SMS-1 and almost half the price (those people must be spitting nails right about now!) Not sure how one would do a specific house curve for it, though. On a thread at AVS, one of the DSPeaker company proprietors noted that the "lift" settings were house curve options. Not sure I would exactly call them that...

Regards,
Wayne


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Old 06-23-08, 12:57 AM   #6
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Re: Testing the DSpeaker Anti-Mode 8033


Very nice work thank you! Very much appriciate it.

Sounds to me like this is a very good product if it took your experience + 3 hours to replicate what the 8033 does in a couple of minutes. Obviously not for the tweaker.

If you could do a multi position calibration and compare that to what you can BFD I would love to see it.


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Old 06-23-08, 09:11 PM   #7
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Re: Testing the DSpeaker Anti-Mode 8033


I think you could use far fewer than 12 BFD filters to get the same or better graph.


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Old 06-24-08, 04:06 AM   #8
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
Nate wrote: View Post
I think you could use far fewer than 12 BFD filters to get the same or better graph.
I don't agree

To simply correct the overall level of the frequency response fewer filters could be used, but that would not correct the decay. To correct the decay the filters have to match the modal resonances, it is the resonances in the room that determine how many filters are required.


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Old 06-24-08, 06:02 AM   #9
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
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I don't agree

To simply correct the overall level of the frequency response fewer filters could be used, but that would not correct the decay. To correct the decay the filters have to match the modal resonances, it is the resonances in the room that determine how many filters are required.
Really?

Is this for to have effect exact resonance freqency more than frequencys around it?

For example I have room modes on both 50Hz and 45Hz. These combined makes quite nasty effect which I have tried to even out with as one big modal peak. Rosponse measurements before and after BFD treatment below.


Even though the responce is quite good when BFD is used, reverbation time is at 50Hz is 3 or 4 times longer than frequencys around it. Even with doublesubs I built after the response measurements above.


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Old 06-24-08, 09:00 AM   #10
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Re: Testing the DSpeaker Anti-Mode 8033


You should use one filter for each modal peak. The spectral decay plot is the best tool to identify the centre frequencies of the peaks, the modal resonances show up more clearly in the later slices as the rest of the soundfield decays away. The decay plot also makes it easy to see the effect you are having on the decay time as you alter the bandwidth of the peak to get the best match to the mode, and to check you have the correct centre frequency by trying slightly higher and slightly lower frequencies and measuring the result. To accurately counter a mode the filter centre frequency needs to be within 1% of the mode's frequency. 1% corresponds to 1/60th of an octave, which conveniently is the step between frequencies of the BFD. Your "50Hz" peak might be 49.5Hz, or 49.0Hz etc. You will see the difference in the decay plot provided you have the filter bandwidth narrow enough, try starting at 2/60th of an octave on the DSP1124P (or 0.067 octaves on FBQ2496, which specifies the width differently) while identifying the correct centre frequency then vary the bandwidth once the centre frequency is right.


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Old 07-13-08, 04:27 AM   #11
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Re: Testing the DSpeaker Anti-Mode 8033


Can anyone test between the SMS-1 and the 8033 ? It would be interesting to see the graph results on REW between the two. I suspect the 8033 would easily outperform the SMS-1 (in manual tweaking mode).

I'm also keen on the 8033 and almost about to pull the trigger. I currently have the SMS-1.

Regards,


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Old 07-13-08, 04:00 PM   #12
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Re: Testing the DSpeaker Anti-Mode 8033


http://www.avsforum.com/avs-vb/showt...1#post14278205


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Old 10-08-08, 04:06 PM   #13
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Re: Testing the DSpeaker Anti-Mode 8033


It would seem the 8033 is not for 'tailoring' but for 'matching' your specific sub to your room, and in that regard, it is invaluable. Even more remarkable, it is not expensive (compared with SMS), and could not be easier to use.
No doubt, if you have the time and interest, going the BFD/REW route is not only even more economical, but likely just as effective, and certainly affords you an education.
I think either method puts the SMS-1 further down on the list of desirable tools these days.


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Old 11-17-08, 02:39 AM   #14
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Re: Testing the DSpeaker Anti-Mode 8033


Would I run Audyssey before or after I setup and run the anti-mode setup?


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Old 11-17-08, 12:21 PM   #15
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
stepyourgameup wrote: View Post
Would I run Audyssey before or after I setup and run the anti-mode setup?
I think I would treat the 8033, after it does calibration, as an integral part of the subwoofer. And run Audyssey only after the 8033 CAL.

I don't know enough about Audyssey to know if there would be any significant changes in the bass region. It's a good question.


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Old 11-17-08, 01:52 PM   #16
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
htaddikt wrote: View Post
I think I would treat the 8033, after it does calibration, as an integral part of the subwoofer. And run Audyssey only after the 8033 CAL.

I don't know enough about Audyssey to know if there would be any significant changes in the bass region. It's a good question.
If you insist on using the 8033 with Audyssey, I would implement the 8033 before Audyssey set up as you suggest. OTOH, I have found that, while the 8033 does a very nice job with the subwoofer, Audyssey is at least as good and does much else as well. IMHO, there's no need for the 8033 if you have MultEQ XT. (Possibly, those with multiple subs might like to have an 8033 on each one before running Audyssey on the ensemble.)

Kal


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Old 11-18-08, 12:43 AM   #17
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
Kal Rubinson wrote: View Post
. . . IMHO, there's no need for the 8033 if you have MultEQ XT. . . .
Not sure about that Kal. It would depend on how bad one's room is, whether the additional filters in an outboard EQ would improve subjectively over the number of filters available in Audyssey. Certainly those folks who are running into receiver volume IC limitations with Audyssey alone would benefit by offloading some of the EQ work to an external unit.

I also would set up the 8033 filters first and then configure Audyssey. An unresolved question is, should one stop after the two steps above, letting Audyssey have the final say, or finish by rerunning the 8033 and let it's programming have the last word?


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Old 11-18-08, 09:44 AM   #18
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Re: Testing the DSpeaker Anti-Mode 8033


By doing the last option you would potentially undo all the Audyssey corrections, as the 8033 would probably select entirely different filters the second time, as the response is very different. It would be like running Audyssey with one sub, then swapping the sub and run 8033.


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Old 11-18-08, 02:40 PM   #19
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
Geoff Gunnell wrote: View Post
Not sure about that Kal. It would depend on how bad one's room is, whether the additional filters in an outboard EQ would improve subjectively over the number of filters available in Audyssey. Certainly those folks who are running into receiver volume IC limitations with Audyssey alone would benefit by offloading some of the EQ work to an external unit.
Since I have not run into the volume IC limitation and my room is not terrible, I found that the 8033 results were not an improvement on Audyssey's nor did I see any reason to need more filters.

The limitations of both, of course, are their inflexibility: you get what they serve. (The new AudysseyPro software addresses this.) The other limitation of the 8033 is the number and weighting of different mic positions.

Kal


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Old 11-18-08, 03:42 PM   #20
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Re: Testing the DSpeaker Anti-Mode 8033


This is what Audyssey in my former NAD T785 did for my three subs combined... no BFD and no 8033. This was two PC13-Ultra's in the front corners and the dual 15" Behemoth in the rear of the room. I was very impressed.



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Old 11-19-08, 08:51 PM   #21
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Re: Testing the DSpeaker Anti-Mode 8033



Quote:
Nate wrote: View Post
I think you could use far fewer than 12 BFD filters to get the same or better graph.
Quote:
JohnM wrote: View Post
I don't agree

To simply correct the overall level of the frequency response fewer filters could be used, but that would not correct the decay. To correct the decay the filters have to match the modal resonances, it is the resonances in the room that determine how many filters are required.
John,

Did you check the BFD's electrical response for the twelve filters after you were finished?


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Save for a few minor ripples, I created virtually identical electrical response with seven filters:


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Would there be any measurable difference between these two sets of filters? More importantly, would there be any audible difference?

Regards,
Wayne


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Old 11-20-08, 04:07 PM   #22
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
Wayne A. Pflughaupt wrote: View Post
Would there be any measurable difference between these two sets of filters?
Yes, most easily seen in the waterfall or low frequency decay plots of the response.

Quote:
Wayne A. Pflughaupt wrote: View Post
More importantly, would there be any audible difference?
That depends on the audibility of extended decay times, which in turn depends on frequency and how long the decays are.

The filter set I arrived at on the day were determined by examining the effect on the low frequency decay plots of altering the filter parameters and tuning for best results. I've since developed some more advanced impulse response analysis tools to extract the modal resonance parameters directly, avoiding the manual tweaking and remeasuring that was required. Those will be included in the next REW release, once the testing has been completed.


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Old 11-22-08, 06:55 AM   #23
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Re: Testing the DSpeaker Anti-Mode 8033


Nice overview on the device John

Flipping I forked out around £120.00 for the Behreinger BFQ2496 I was rather surprised with this devices automatic performance, with slight variances between the (BFQ2496 and the Anti-Mode 8033) interesting most interesting.

So can you hire this device out for the day?



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Old 02-04-09, 01:03 PM   #24
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Re: Testing the DSpeaker Anti-Mode 8033


I am contemplating between SMS-1 & 8033. My room has modal peaks at 28hz(approx 8db) & 50hz(approx 12db) with corresponding dip at 40hz. BFD/REW is too daunting for me therefore I am looking at an auto EQ that will minimize the peaks. Need input from all you experts.
Thanks.


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Old 02-04-09, 01:45 PM   #25
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Re: Testing the DSpeaker Anti-Mode 8033


Quote:
vinodk wrote: View Post
I am contemplating between SMS-1 & 8033. My room has modal peaks at 28hz(approx 8db) & 50hz(approx 12db) with corresponding dip at 40hz. BFD/REW is too daunting for me therefore I am looking at an auto EQ that will minimize the peaks. Need input from all you experts.
Thanks.
You will probably get more response and/or a better response by starting a new thread.


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