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Technology H-PAS Bookshelf Speakers First Look

post #1 of 9
9/27/10 at 8:18am
Thread Starter 
http://www.audioholics.com/reviews/s...chnology-h-pas

SpecificationsType H-PAS, 2-way
Woofer: 5.25" (135mm) GLH
Tweeter: 1-1/8" (28mm) low resonance silk dome
Frequency Response: ~39Hz - 20kHz ±3dB
Nominal Impedance: 6Ω
Crossover Frequency: 2.1kHz
Crossover Type: Parallel, 2nd-order LP, 3rd-order HP
Sensitivity: 89dB
Recommended Amplifier Power: 20 - 200 Watts RMS
Dimensions w/grille: 8-3/4" W x 15-5/8" H x 12-1/4" D (222 x 396 x 310mm)

The prototype of the new Atlantic Technology AT-2 is less than 16 inches tall and has an interior acoustic volume of less than 2/3-cubic foot, yet it delivers full, rich bass response down to 39Hz at -3dB.

The prototype version of Atlantic Technology's upcoming AT-2 bookshelf loudspeaker uses a single 5-1/4" long-excursion woofer and the same 1-1/8" Low Resonance Tweeter (LRT) used in the AT-1. It has a crossover frequency of 2,100 Hz, which is much lower than most conventional two-way speakers, affording much wider horizontal midrange dispersion. The cabinet dimensions are just 8-3/4" wide by 15-5/8" high 12-1/4" deep (222 x 396 x 310mm).

No pricing info yet but these look interesting
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post #2 of 9
9/27/10 at 9:07am
Quote:


prototype of the new Atlantic Technology AT-2 is less than 16 inches tall and has an interior acoustic volume of less than 2/3-cubic foot, yet it delivers full, rich bass response down to 39Hz at -3dB.

You know that is just marketing spin, right??

One man's full, rich bass is another man's crap bass
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post #3 of 9
9/27/10 at 9:15am
Thread Starter 
Quote:
Originally Posted by penngray View Post

You know that is just marketing spin, right??

One man's full, rich bass is another man's crap bass

Well the tower version get a pretty good review

http://www.soundandvisionmag.com/tes...h-pas-speakers

And, at least in the AT-1, H-PAS performs as advertised. A bit paradoxically, however, the AT-1's ability to make real bass may not amaze less critical listeners, because plenty of similar-sized speakers produce subjectively impressive bass, usually via an intentional rising frequency response through the 120 Hz-60 Hz octave, before falling off sharply below that point. But it should gobsmack knowledgeable audiophiles.

In my room, Atlantic Tech's modest towers yielded what I judged to be unfettered output to at least 30 Hz. And by "unfettered" I mean flat or damned near so - not -6 or -10 dB (or more) at 30 Hz, which is how every other speaker remotely close to this size would measure.
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post #4 of 9
9/27/10 at 9:21am
That is all find and dandy but getting a flat response down to X Hz isnt all that meaningful, Its one of the biggest audio myths out there to believe that a flat response on axis alone remotely matters. Its meaningless without other important measurements. Companies push the flat on axis agenda because they can sell you on it.

Tower, bookshelf. The size of the box is not all that important when it still uses a very small driver and is selling you on the idea that small drivers can do bass....Laws of physics are never broken

As long as you understand the limitations of this design then enjoy all the marketing hype around it.
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post #5 of 9
9/27/10 at 9:27am
fwiw, We have discussed H-PAS on this forum and in more detail in the DIY forum in the past (you can search).

I do think the design stuff is cool, Of course its just like the Acoustimass from BOSE
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post #6 of 9
9/27/10 at 9:32am
penn...I agree that off-axis numbers are important, but for bass(which I think people are focusing on with this speaker), since it becomes less and less directional, it isn't a big deal. I don't think I have seen poor off-axis "bass" measurements for any speaker.

While I understand what you are saying about marketing hype, there is at least some merit to what they are able to achieve. 39hz is great number for that size of box and driver, but not remarkable.
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post #7 of 9
9/27/10 at 9:35am
Quote:
Originally Posted by cschang View Post

penn...I agree that off-axis numbers are important, but for bass, since it becomes less and less directional. I don't think I have seen poor off-axis "bass" measurements for any speaker.

While I understand what you are saying about marketing hype, there is at least some merit to what they are able to achieve. 39hz is great number for that size of box and driver, but not remarkable.

Anyone can claim A "flat down to....." statement and get it down at some lowish DBs but for the claim to be valid wouldn't we want to know what is the max SPL of that speaker for clean, flat output down to 30Hz??

I mean if it can not even do 100dB that low then who cares how flat the response is at 75dB measurement levels. It will sound like crap during any peak momments in songs and movies.

We debated this topic already and I will agree that for its size its pretty cool but I will post again the OP should know its limitations.

Computer speakers, near field listening are fine applications but 30Hz to 80Hz requires proper design to be qualified as "full, rich bass " in my books. Maybe Im just too fussy about my bass There is nothing FULL and RICH about that bass design compared to LMS 5400 with 4000Watts in a 3 cuft box
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post #8 of 9
9/27/10 at 9:54am
penn...when you state +-XdB...or take measurements, you do so (usually at 1w/1m), so in the case of this particular bookshelf, it is -3dB at 39hz, which would be about 86dB if the specs are correct.

39hz at 86dB is very audible.

There are not many people that listen for pleasure, for more than a single song(if that much), with 100dB peaks. Also, when you listen that loudly, you can't discern the differences in FR....so a flat FR, on or off axis, really doesn't matter.
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post #9 of 9
10/20/10 at 9:42am
While I can't vouch for the AT-2, I have heard the AT-1 and can say that it most defintely can play loud at those very low frequencies - which is one of the inherent benefits of the H-PAS design. No, I've not measured it - except with my ears / body.

Again in the case of the AT-1, if there had been a limitation of any kind in its higher level deep bass reproduction, I am certain that those who have now posted reviews (including S&V) would have pointed this out.
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