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SVS AS-EQ1 Sub EQ

by Tom Andry last modified May 12, 2009
AS-EQ1 Sub EQ

AS-EQ1 Sub EQ

Summary

  • Product Name: AS-EQ1 sub EQ
  • Manufacturer: SVSound
  • Review Date: May 12, 2009 10:15
  • MSRP: $799
  • First Impression: Gotta Have It!
Specifications
  • Driven by an advanced Digital Signal Processor (DSP) using sophisticated Audyssey customized
    room-correction algorithms
  • Utilizes Adaptive Low Frequency Correction Technology (ALFC) from Audyssey Lab the most advanced
    bass calibration method available to consumers today
  • Performs in both frequency and time domain, for superior artifact-free bass adapted for your room
  • Dual subwoofer processing for better blending and integration with main channels
  • FIR filters to avoid time/phase distortion inherent with IIR filters for superior bass clarity
  • Corrects bass for an incredible 32 positions in horizontal and vertical space to cover any listening area
  • Heavy-duty steel chassis with SVS's magnetically-retained CNC'd aluminum face-plate
  • Twin sub in, twin out, with multiple configuration modes. Mains level calibration signal output jack.
  • Easy-to-use laptop PC graphical user interface (GUI) and CD operating software and users' guide
  • Dedicated Audyssey microphone and AV receiver external calibration pass thru cables included
  • High quality, isolated 12V. power supply, and USB cable included
  • On-line SVS tech support page for easy software updates, upgrades and news
  • Power and unit status LEDs
  • Front-panel easy access for calibration microphone and USB connection
  • Final test and assembly in SVS's Ohio headquarters
  • Limited production, world-wide distribution only by exclusive SVS resellers

Executive Overview

as_eq01_woplateThere are so few standalone active room correction systems on the market these days. Those that are available tend to be standalone not only in function but price costing many thousands of dollars. The alternative is usually to buy a sub with some manual correction (like a signal parametric EQ knob), an expensive sub with a more complete suite, or to buy a new receiver every few years. The ones with the really good room correction system usually cost quite a bit of money so again, you're stuck with a substantial investment. Even if you have purchased a receiver in the last few years, the newest ones are coming out with multiple subwoofer outputs which is giving most every audioholic a bad case of upgraditus.

as_eq01_subeq_guiSVS may have what ails you. For a very reasonable (in this category) $799 (currently $699 on preorder) the AS-EQ1 sub EQ is their new standalone room correction system. A joint venture with Audyssey Labs, a name that is becoming synonymous with room correction, the AS-EQ1 offers computer interface, dual subs, and some very interesting aesthetics. The unit sports a magnetic faceplate which covers all the controls and most of the lights. The SVS and Audyssey logos are prominently placed on the faceplate but not the control face underneath. This has your mic inputs and outputs and your USB connection.

Unlike other standalone room correction systems (most notably the Velodyne SMS-1), the AS-EQ1 seems to be taking a different tact altogether. Most room correction systems use parametric EQs - the Audyssey solution uses a system of FIR filters (more info here). In fact, you may be familiar with the particular flavor of Audyssey used by the AS-EQ1 - MultEQ. While they don't specify this, the fact that the SVS version can take up to 32 measurement positions suggests that they are actually using MultEQ XT. This is often found on the very best receivers on the market with only one more "higher end" version of Audyssey available - MultEQ Pro. Receivers with MultEQ XT generally run in the $1000+ range.

as_eq01_fullbackWith dual sub support, the AS-EQ1 is definitely a forward thinking product. The tweakers in the audience might not be as in love with the AS-EQ1 however as it is mostly an automatic process. Unlike other solutions in the same range, the AS-EQ1 will do most of the work for you - you just have to set up the mic and press "go." What was a slightly odd choice was that the SVS solution doesn't have a onscreen interface. Instead, you have to plug it in to your computer. Not a problem for those of us with laptops (or really long cables) but could discourage some buyers. You're definitely going to want to be aware of this limitation.

SVS makes some pretty serious claims about the AS-EQ1 such as, "In fact, we guarantee it. Acoustical nightmares are cleaned up fast as you can move the included microphone through your room." They are obviously excited by the product and want you to be as well. Ease of use is on the menu as is ease of setup. With two inputs and two outputs, it couldn't be simpler. What's nice is that if you have a single sub output on your receiver and you have two subs, you can plug the input into A and connect both of the subs - the AS-EQ1 will split the signal for you. In fact, if you have two different subs in two different systems you can use the unit to calibrate each separately.

The AS-EQ1 is designed to be used with your receiver/processor's Auto EQ system. If you plan on using it, you connect the receiver/processor calibration mic up to the mic passthrough port on the front of the AS-EQ1 and run the auto calibration. The AS-EQ1 will tell your receiver that a sub is available but will not allow any test tones to the sub. This forces your receiver to calibrate only the speakers and leave the sub to the AS-EQ1. This is extremely handy as it ensures that the AS-EQ1 is truly an add-on bonus and doesn't defeat or make obsolete other (or future) room correction systems. One thing that all users will like is that the AS-EQ1 will provide before and after graphs of your room. This will let you know exactly what the AS-EQ1 has done. If you're still seeing problems, it's time to look into passive room treatments.

Conclusion

logoSVS most likely has a winner on their hands with the AS-EQ1. We're dying to get our hands on one for review to see just how well it works. For the two channel crowd or people that are waiting for HDMI 1.4 to upgrade their receivers and want an easy to use room correction system, the AS-EQ1 is just what the doctor ordered. It's built to work with existing technology without overriding anything, it is easy to setup and maintain, and it lets you know exactly what it did via pretty graphs. If your mouth isn't watering just thinking about this product, you may have your Audioholics license revoked.

For more information, please visit www.svsound.com.

Recent Forum Posts:

Post Reply
rmk posts on June 14, 2009 20:33
Warpdrv;581922
Looks really nice by the graphs, they did a nice job with this product...

In room EQ is really starting to get to be nice and easy, as well as potentially having a major impact on ones system, depending on the room..

I am very happy to say that Anthems ARC has done an extremely nice job in my difficult room, so I have no need for a product like this, but many will.

Thats cool that the ARC is doing the job for you (with a little assist from quad subs).
Doug McBride had looked at photos of my room (there are a couple around) and we were both skeptical as to what if any improvements the AS-EQ1 would make in my room due to the multiple subs and extensive treatments. As it turned out there was a noticeable difference. Now I just need to decide if I like the difference. That’s going to take more than the two hours I had last week.

I think the product was designed for the non-dedicate/treated space and that is its real sweet spot.
Warpdrv posts on June 14, 2009 19:02
No, ARC only accounts for just the LFE channel, not separate subs - but I have 4 of them in my room and it has shaped the FR very very well in my room. No complaints from me here....

I will have to do some measuring with REW to see what the response is from multiple locations, but I have never really had an issue with poor bass in this large really oddly shaped room, even without any bass traps whatsoever. So that pretty much makes me spoiled. I had more of a difficult time trying to get enough bass, never worrying about poor bass, but I got that problem licked for sure.
Lordoftherings posts on June 14, 2009 18:42
Hey Warpdrv, is Anthem/ARC1 does Room Correction EQ for two subs?

Bob
Warpdrv posts on June 14, 2009 16:37
rmk;580017
Here is the combined output before/after


These graphs show a nice improvement in FR but they can be a little deceptive due to averaging and a lack of resolution in the graphs themselves. In other words, the sound improvement is slightly better in my room subjectively speaking but not to the degree the graphs might indicate.



Looks really nice by the graphs, they did a nice job with this product...

In room EQ is really starting to get to be nice and easy, as well as potentially having a major impact on ones system, depending on the room..

I am very happy to say that Anthems ARC has done an extremely nice job in my difficult room, so I have no need for a product like this, but many will.
rmk posts on June 14, 2009 11:49
Interesting exchange re the AS-EQ1 with Ed Mullen on another Forum:

Quote:
Ed Mullen wrote: View Post
If you noticed a lack of slam/impact on certain scenese after the AS-EQ1 was set-up, I suspect your subs were simply running too hot previously and/or had peaks which have been flattened.

The AS-EQ1 targets a flat FR and does not have any limiters or DRC circuits. It also targets a level-matched subwoofer with the remaining speaker channels (which I suspect is the primary cause of your observations).

A level-matched and flat subwoofer system will playback as intended by the director and mixing engineers, provided the subwoofer system does not otherwise have any output/extension limitations (which is certainly the case with your dual Danley, which have virtually unlimited clean output).

After the AS-EQ1 EQ routine is run at 75 dB (required to avoid digital headroom/clipping issues), then the user is free to run the subwoofer system as hot (or cool) as he wants to satisfy his personal taste in bass (which vary greatly among enthusiasts).

Over time, I have gravitated to a preference for a flat and level matched subwoofer system, as opposed to any fixed/static "house curves" or running the sub system hot. It may be initially less impressive during demos, etc., but over time it is far less fatiguing and simply sounds "right" to my ears. Bass effects - even deep/loud/impressive ones - are rarely mixed at such a level as to completely dominate a soundtrack to the point of being distracting.

You're free to run the subs as hot/cool as you like of course, but I recommend giving flat/level-matched a try for a while before concluding it sounds castrated or nuetered; "different" is often initially perceived to be "worse" until the listener adjusts to the new sound. I'm betting if you adjust to flat/level and then go back to hot/peaky, that the subs will simply sound overblown and domineering. It's often just a matter of time/perspective that will skew our opinions accordingly.

As for the AS-EQ1 and the SMS-1 having different trim/gain settings, that is simply a function of the two devices have different sensitivity and unity gain settings on the inputs stages and different voltages on the output stages. That is why, of course, the AS-EQ1 instructions require the gain setting on the amplifier(s) be adjusted during the subwoofer test tone so that the subwoofer is playing at 75 dB before proceeding to the EQ stage.

Thanks for the comments Ed. Of the fours hours I had with the AS-EQ1 at least two of them were spent on connections and running the setup. That did not leave enough time to reach any valid opinions so my comments are more casual observations.

I did find the trim/gain delta interesting. I had to increase the gain on my sub amp 25% to get setup to run and after running the AS-EQ1 setup, I had to increase the sub evel in my Integra Pre/Pro by more than 10db to hit the target 75db. That is a pretty significant sensitivity delta.

In any case, I run my subs level matched (or very close) with the other speakers and the SMS-1 takes care of the peaks so that I have +/-4db from 18Hz - 100Hz on the LFE channel at the #1 LP. What you describe as "hot/peaky", I could call dynamics. Audyssey Flat is one thing but there seemed to be LF content that was missing altogether when running Audyssey (hence nuetered). I found that was the case with Audyssey on my SSP as well but after many attempts, I finally got it to where I liked it. Maybe that is the adjustment period you mentioned.
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