Front- vs. Down-Firing Subs and Amp Issue


A couple of assertions in the audio world have me perplexed as to how to select a subwoofer for my two-channel system.

Richard Hardesty makes the blanket statement in his Audio Perfectionist Journal that down-firing subs should never be used for high-end two-channel audio. Only front-firing subs are suitable for this application. I see, however, that some of the most-recommended subs on a'gon (Hsu TN series, ACI and REL come to mind) are down-firing (or up-firing in the case of Hsu.) Maybe the answer is that audiophile subs can't be purchased at the price point most mortals can afford, and the lower-priced subs just happen to be down-firing? Oh, Hardesty also says ported subs are not suitable for high-end audio; must go with a sealed box. Interesting.

The second assertion comes from Mike Barnes at nOrh, who says on his website that the plate amps used in 90% of subs today is crap and puts out only a fraction of power that is claimed. The sound that was rattling his windows and creating "earth-shaking bass" was not bass at all- it was distortion. He also states that he began tests in subwoofer development using the popular Peerless 12" woofer, which was literally shredded by a (non-plate) 150-watt amp.

So now I'm confused. Is it possible to buy a high-quality sub for relatively little money? I can't bring myself to spend $3-5k on a pair of speakers only to turn around and spend nearly that much on a sub. Oh, and then I hear that if I want the best possible configuration I need two subs at twice the price, making my subs more expensive than my speakers. Is this just a fact of life that I'll have to come to grips with if I don't want to buy speakers that go down to 20hz?

Thoughts?
aggielaw

Showing 3 responses by tgrisham

All of the above comments have merit. It will depend on your room. My down-firing REL reinforces my two channel monitors but is crossed-over at 40 Hz and is sealed. It has a "presence" in the room and is necessary for realistic reproduction of music, but not for movies. I have a Hsu VTF-3R Mark 2 and it doubles for movies (crossed at 60 Hz even with floorstanders) and music. It is hardly on for music but fills in a little at the bottom. It is a compromise and better with movies. I recommend REL for adding bottom to 2 channel. My opinion: a subwoofer should be front firing if it is crossed over high enough to localize (60 Hz, 80 Hz, 100 Hz?) and then should be placed in front between the mains. An advantage of the mail-order companies is trying them in your own home and seeing how it fits. Also, 2 subs are twice the challenge of 1 in terms of set-up. Good luck!
Rauliruegas,

I understand the concepts. I too believe that 80 Hz is the limit for localization of low frequencies, but others disagree. Below 80 is not a problem, above 80 can be. Bass frequencies have such long wavelengths that the position of the sub has more to do with modes and room interactions, unless the crossover is high. If the sub can be localized due to the higher frequencies it produces, then it should be placed near the front speakers. This will minimize the confusion created by various sound sources arriving at different times. In an ideal world we would have speakers flat from 10 Hz to 30k Hz and subs would not be as important. As such, I believe that subs are important. Implementing them in a given room is the challenge and I have only been successful through trial and error. I tried the formulas and gave up! The key is to continue to have fun, not take it too seriously and experiment. And, I agree, its only about the music.
Back to the original point....it is personal preference. Money doesn't guarantee performance. Listen to as many subs as possible, in your own room if possible. My opinion is this: I have enjoyed my 2 channel more with a sealed REL and my movies and DVD concerts more with a vented VTF-3R Mark 2 Hsu sub. Good luck!