Getting the most bass out of a driver

[BAM]

Which design would get the most bass out of the Hi-Vi B2S wideband 2"? I want to design a pair of ultra-mini-speakers and I want to know whether it is better to build a transmission line or a vented box (that is, which is better for harnessing the back wave?) The Hi-Vi B2S's are cheap enough for this kind of project, and they'll be driven with about 5 watts.

[planet10]

Originally posted by BAM
Hi-Vi B2S wideband 2"

Got specs/ A URL. I've seen pictures of these -- they look quite interesting.

dave

[navin]

how much bass can you get out a 2"?

are these similar to what Bose uses in their Acoustimass series?

[planet10]

Originally posted by navin
how much bass can you get out a 2"?

not much, but it quite amazing how low these small drivers seem to go. I have both Apple/HK's 25mm and 35mm speakers and they do a credible job at low volumes. Start turning it up and they just can't move enuff air.

dave

[navin]

yes i saw those small apple speakers thought they came with a sub.

looked like gallo speakers.

might be useful in 4s for surround speakers. 4 to increase capacity and dispersion (if angled accordingly).

[BAM]

The H/K Odyssey drivers that come in the Apple Pro Speakers are right around 1.5" in diameter, and they are in a sealed enclosure. They are mighty fine, in my opinion, for multimedia drivers. The iSub (as the H/K Apple sub is called) is sold separately, or with the USB SoundSticks.

These drivers are actually smaller than those used in the Bose dual-cube speakers, but they are slightly larger than those used in their Jewel Cube speakers, and of a lot higher quality. They are aluminum-coned.

All I'm going for is percieved bass response, not actual low bass. These need to be relatively compact and look good. These are "casual listening" speakers and won't be used for much more than radio and the occasional CD, and ultimate SQ isn't absolutely necessary. The B2S look like they would be better at the lows than the Tangband 2-inchers.

Parts Express
http://www.partsexpress.com/pe/pshow...number=297-432

[planet10]

Originally posted by BAM
The H/K Odyssey drivers that come in the Apple Pro Speakers are right around 1.5" in diameter, and they are in a sealed enclosure. They are mighty fine, in my opinion, for multimedia drivers. The iSub (as the H/K Apple sub is called) is sold separately, or with the USB SoundSticks.

I have a pr of these from my wife's cube (affectionatly called crysal spheres). I'm still not sure whether they are sealed or the elaborate internal structure actually terminates in a very restricted opening (ie aperiodic). The iSub and the sub with the sound sticks are slightly different -- these subs are often called jellyfish subs.

Parts Express
http://www.partsexpress.com/pe/pshow...number=297-432 [/B]

With a Q of 1.2 these would probably like an aperiodic enclosure to get the most extension from a small box.

dave

[navin]

what does Bose use for the Acoustimass series.

while I am on that topic many years ago I was asked to repair a pair of Bose 301s. the speaker had 1 8" woofer and 2 1" cone tweeters. total driver cost $10 ($7 for the woofer and $1.50 for the tweeters) include cabinet and what they call a crossover (a single cap) and total estimated raw material costs for a pair $50.

They were sold for $300+ that they could sell them for $300 is testament to Bose. Marketing or otherwise (MS has a simialr reputation) Bose was and is able to sell more speakers at better marins than just about anyone else.

From this I gather they dont sound half bad. ;-)