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post #9931 of 9937 Unread 04-19-2015, 08:38 PM
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Thanks HTPCat, I emailed Mark earlier tonight and he replied right away and is going to send me packing material and a return label and take care of it. Great service. Hopefully I will be up and running soon. Keep you posted.

Mario
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post #9932 of 9937 Unread 04-20-2015, 10:42 AM
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Quote:
Originally Posted by Skrill View Post
I just wanted to revisit my recommendation of this hum filter. I was taking measurements for the first time since I installed it a couple months ago as I just added some acoustic treatments. I was getting really odd results with all the bass being attenuated rolling off terribly starting at 40 hz (at 20hz it was down over 15db). I traced the issue to this ground loop isolator (along with an intermittent drop off in the 80 hz area). Once I took it out of the signal chain I got much flatter response including very good response below 20hz.

So if you are using this -- I would recommend you take measurements. Perhaps mine is just defective -- but this thing seems to be junk, and I wouldn't trust it.

It certainly kills the hum -- but also kills your bass response.

I did measure distortion with Omnimic.
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post #9933 of 9937 Unread 04-20-2015, 10:54 AM
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Quote:
Originally Posted by derrickdj1 View Post
I did measure distortion with Omnimic.
I was measuring with REW and a UMM-6. My bass response with the hum filter showed an odd dip around the crossover (80hz) that would come and go, and a steep roll off starting at 40hz. I don't have the charts - but I was down 10 db at 30 hz, 15+ at 20 hz and at the noise floor by 15hz. Without the filter I had 85 db response +/- 3db from 15hz to 80hz (which is pretty normal for my setup with the MVC set at -15 -- which is where I measure).

Again -- maybe my unit is defective.
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post #9934 of 9937 Unread 04-20-2015, 11:03 AM
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This is my response. You may need to work on the phase and time alignment of the system. I am not sure without knowing more about your system.
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post #9935 of 9937 Unread Yesterday, 10:28 PM
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Quote:
Originally Posted by derrickdj1 View Post
This is my response. You may need to work on the phase and time alignment of the system. I am not sure without knowing more about your system.
Phase and time alignment are handled by receiver using Audyssey XT32 - and I don't think that is the issue.

I took some measurements. And tried something new -- this Hosa GLT-255 ground lift adapter that I picked up for $9.

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

Here is the baseline sweep with Audyssey on (but Dynamic EQ or DEQ off) - and the sub signal running through my Velodyne SMS-1 to get some further smoothing. Master Volume on the Denon is set to -15db. I used a UMM-6 mic and REW to take the measurements (and set the filters for the SMS-1). None of the charts have smoothing on. This chart shows the sweep using only a cheater plug to kill the ground loop hum:



This next graph is using a Hosa GLT-255 ground lift filter in the signal chain (and plugging in the Seaton SubM directly - i.e., no cheater plug).



I did not overlay them as they are essentially identical measurements.

Next is the reading with the GLT-255 (green) versus the Ebay hum filter Derrick and I are discussing (purple):



You can see the Ebay filter is murdering my bass response. Again -- this could be due to a defective unit. I did email the vendor, and he said he would send a new one.

For fun -- here is a sweep with the GLT-255 (no cheater plug) and DEQ turned back on (blue) - which is how I listen.



So the Hosa GLT-255 seems to be a winner. It kills the ground loop hum dead (I can't hear it at all with my ear virtually against the woofer). And seems to do nothing to the signal quality. Oh and it's $9 shipped via Amazon ... can't beat that!

I would love to further address the dip that starts around 28hz -- but it is within 3db of the average response, and I can only do some much tweaking when there are so many great movies to watch and music to listen to. To my ears the system sounds great.

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post #9936 of 9937 Unread Today, 09:26 AM
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Keep the GLT filter. Since there is no smoothing, I would not worry about any small dips and be happy. You have excellent results and none of the small peaks and dips will be audible. These graphs don't need to look like a line made with a straight edge.

Your results are way different than mines with the filter. You lost around 35 db.
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post #9937 of 9937 Unread Today, 01:54 PM
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Just got back from AXPONA here in Chicago.

My first time experiencing a full 7.4 Seaton System. He was running Catalyst L/C/R, Spark surrounds (x4), and four different (dual stacks) of massive 15" subwoofers.

Damn!

That Interstellar vortex scene was just nuts. I heard people talking about it on other floors as I ventured around and rightly so; a ridiculous amount of raw, effortless, clean sound with crystal clear dialogue punching right through the center of that absolutely giant room. They sounded like they were not even close to straining in the slightest, which is saying a lot for how huge that room was.

The Catalysts impressed me as much as the subs; they not only keep up for movies but played music perfectly as well.

Mark, you've come a long way since selling me that Contrabass out of your garage circa 2003!

Cheers to the most fun room at AXPONA 2015.
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Tags
Seaton Sound , Velodyne Dd 15 Digital Drive Subwoofer 15 Inch Gloss Black , Velodyne , Speaker Systems , New Pac Sni 1 Ground Loop Signal Isolator



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