Originally Posted by Mark Seaton
Ground loops when using the XLR-RCA adapters and high power (>1000W) amplifiers is more common that we would prefer. In most systems using a non-grounded preamp such as your Integra, it's usually a simple fix of providing a ground at the preamp. There are a few options, but the most convenient is if you have a surge protector near the preamp.
1. If your surge protector has a coaxial output for cable/sat, you can connect either of the outputs to the antenna input with any coax cable. The surge protector grounds the shell of the coax to the 3rd pin ground at the wall and provides a ground to the receiver through the braided shield of the cable.
2. If you have a component/rack style surge protector similar to this
you can connect any wire from the "ground lug" on the back to the ground terminal on the back of your preamp next to the phono input (small thumb-screw).
3. You can also connect a wire to the phono ground screw on your Integra and then to a screw on an outlet cover or to any other device that is grounded. For testing you can even just wrap the wire around the threaded shell of the coax outputs on a surge protector.
All of these work in the same manner, with the preference just being what will stay in place and what is easiest to accommodate. You may also want to try disconnecting the cable or satellite line from the electronics to check if this is the source of the problem.
Quick update on my impressions of the dual Seaton Submersive HP+ vs. my JL Audio F112 pair as I wait for my cable tv line hum eliminator:
I did a quick Audyssey XT32 calibration (waiting on my minidsp 2x4 to EQ them properly) prior to listening:
1.) These subs are in a different league vs. my dual JL Audio F112
2.) Listening to pop/rock with strong electronic bass beats, it finally provides the hit you in the chest, totally clean, tight and fast bass that I was looking for. Note: The JL Audio F112s are really phenomenal for their size and they will take up position in the rear of my room.
3.) I have not yet found their limits. The wife needs to be out of the house prior to this test
4.) I was waiting a while, debating between a JL Audio Gotham or Paradigm Sub 2. For about the price of a single Gotham or Sub 2, I now have four incredible subwoofers in my movie room with the added benefit of having the dual Submersives vs. a single Gotham or Sub 2.
5.) The power headroom of the Submersives might be compared to when you hear a very powerful singer that can effortlessly keep increasing the volume and you have total confidence that their voice can keep getting louder without any hint of strain.
6.) I have only tested a few movies. The transformer (original) scene where Ironhide does the barrel roll to dodge the tank ordinance while the lady below him screams was finally done right with no unnatural sounds. The first two transformer movies, while they may not have the deepest bass, have some powerful bass that is truly amazing to me with these new subs. I was just sitting there with a smile on my face.
7.) Again, music is truly phenomenal in my room: clean, very tight, powerful bass ... it puts a grin on my face when I crank it up.
So I am completely happy with my purchase and can't wait to continue to demo more and more movies. I have already sent an invite out to my buddies for guys movie night next weekend.