I moved this question from my build thread to here. It seems more appropriate.
Has anyone heard of (silly question since everyone here is on the edge of the art) :-) the SVS/Audyssey AS-EQ1?
It's pretty expensive, and I am trying to do my project on somewhat of a budget, but it sure looks like an interesting device to optomize in-room response with multiple subs.
I get the feeling that it can flattten response by doing more than attenuating or boosting at certain frequencies. If I understand it correctly, it can alter the phase between subs to reinforce or cancel in certain locations.
What's the story? Anyone know?
Last Edit: May 18, 2009 10:39:56 GMT -7 by luv2boat
Don't know if anyone will find this interesting. I figured I'd post in none the less just in case. I am curious about this device since I just completed a two manifold IB install, and am now trying to figure out the best way to equalize it. My friend Reinyn pointed me to this device as he has been seeing it mentioned on several threads about town, and thought it might just be a hot solution for my install. I went to the website and looked for specs, but could not find any. I decided to drop them an email and ask about the product. Here is my email and their reply. I pasted directly from my email so it reads in reverse order with my question at the bottom.
I’m a big fan of IB subs, having helped design/install a few myself.
The AS-EQ1 has sufficient filter resolution to equalize into the 6-7 Hz region, and does not have an internal high pass or any other type of low-end limiting. As you are probably aware, most electronic chains (player, pre/pro, amp) start to high pass <10 Hz anyway, and chasing the response to DC is more trouble than its worth. If your system can maintain a flat or rising (due to room gain) response to <10 Hz, the AS-EQ1 will follow suit. With that said, it does have an extremely sensitive roll-off sensing algorithm, so if there is a high pass somewhere in the signal chain, the AS-EQ1 will find it, and will start to roll-off the system at that frequency.
Without having seen or measured the FR of your system, I have high confidence that if the system is seeing a decent amount of room gain, that a flat response to 10 Hz or even deeper is quite likely. Having said that, I have seen some bizarre modal responses at ULFs though, depending on the house dimensions, the presence of long ductwork, and the overall structural rigidity of the boundaries. So I strongly recommend that you measure the native FR of your system with a high quality test rig (i.e., don’t use an RS meter for a mic and a $40 sound card) and Room EQ Wizard (freeware) so that you have a baseline/reference point.
Regardless, the AS-EQ1 comes with a 45-day no-questions-asked in-home trial period – all you risk is shipping. There isn’t another EQ solution on the market which can touch the AS-EQ1 for filter resolution, overall processing power, dual sub capability, the ability to address both the magnitude response and the time domain response, and which uses minimum phase FIR filters which do not suffer from phase anomalies (unlike conventional IIR filters). If you think your un-equalized IB sounds good now, just wait until all that raw power is harnessed by the AS-EQ1. Think iron fist in a silk glove and you’re there. :^)
Ed Mullen, PE
Customer Service Director / Product Development Manager
SV Sound, LLC
(585) 486-1787 (fax)
From: Chris Bolkan [mailto:ChrisB@cadwell.com] Sent: Friday, May 15, 2009 6:00 PM To: SVS - Tech Support Subject: AS-EQ1
Hello SVS Techs and Engineers!
I have just completed a very large dual IB subwoofer project in my home (essentially giant dual subs) and need to EQ it . Each manifold contains four 22mm linear X-max 15 inch subs which use the basement of the home as the enclosure and vent into the listening area. Total driver count is 8. I have adequate power to take all drivers to X-max. The ELF response and power is almost unbelievable. I expect it to achieve near reference level at 10 Hz, although I haven't measured actual output yet. It is an experience just to listen WITHOUT equalization! The reason for all this babble is to convince you that the system is capable of tremendous output at frequencies lower than most equipment is designed to even function.
This system will need EQ. I am looking with great interest at the AS-EQ1. What is the useful frequency response of this device? Can it can optomize the ENTIRE frequency range my subs will be capable of reproducing, ie. Useful response <10Hz? I have not been able to find any detailed specifications on the device. It looks like the BOMB, but I want to see detailed enough specifications before I consider purchasing one. I would HATE to purchase any solution that is not capable of taking FULL advantage of the sub's potential capabilities.
Please let me know the capabilities of this device.
I look forward to your response with great interest.
Chris Bolkan Ouality Assurance/ Regulatory Affairs Cadwell 909 N. Kellogg St. Kennewick, Wa. 99336
Post by ramrod152001 on Jan 24, 2010 12:51:04 GMT -7
Hey everyone, I want to strongly endorse the AS-EQ1 for your system, it was the best money I ever spent on my system besides building my IB. Im just the type that hated doing all the BFD measurement crap, now its in my closet where it belongs. AS-EQ1 made it nice and flat, but if you desire more slam with lower volume, just turn up the subwoofer trim level a few decibels. Now I want to buy a pre pro with Audyssey to see what it does for my 4 Energy Connoisseurs C-9 and one Energy CC-3. Having the flat EQ makes it so you can raise the volume without the fatigue.
Post by ramrod152001 on Jan 24, 2010 12:53:54 GMT -7
And yes it does optimize full bass frequencies all the way down to 5hz, in fact it was funny comparing my IB graph results to box subwoofers because the bass in the IB graph extended strongly to 5 and 10hz compared to the roll off at about 20hz with (good) box subs