No no....I was speaking of SVS because that was your choice.

My choice for output AND sound quality is the Hsu.

No third party has measured a EP500 to 15hz in-room....yet....or 19hz anechoically....it is too new.

The Hsu has been measured flat, anechoicly, to 18hz, and in-room to 16hz by a third party. Obviously...all rooms are different. The sub has been around a long time.

Plus, I have heard the TN1220 compared to my VTF-3, and sound quality wise, it is cleaner.

I have heard two SVS subs in my room...and I thought my VTF-3 was cleaner. Some will call me biased, so if you have a chance to compare, I suggest you do so.

Here are three subs...so you can guess the relative sizes:
SVS PB12+(single driver), my VTF-3, and my STF-2. Remember, the PB12-plus/2 is even bigger.


Despite it being bigger...in my room, it offered no performance gain as far as output is concerned.....but my room is 14x18x9.