QUICK Question on baffles

[Petebass]

Thanx for that Mr. Foxen,

Has anyone USING these Orange ISOBARIC cabs got any opinions??
e.g. -
Does the 2x10 sized 410 actually put out as much SOUND as a regular 410?

It bugs the he'll out of me that Orange market these cabs that way. There's already enough bullsh1t in loudspeaker marketing without Orange going out of their way to destroy their credibility with anyone who actually knows a little bit about speaker design.

 

[GregDunn]

Incidentally, putting a speaker in a small enough sealed cabinet actually causes a pressure build-up that restricts the cone motion substantially; Edgar Villchur at Acoustic Research took advantage of this in the 50s to build a particular type of sealed cab called the "acoustic suspension" box. He used a driver with an extremely low resonant frequency, and the act of sealing it in a small box raised the resonant freq to something roughly the same as that of a large ported box, but used the air as part of the speaker's suspension, which was incidentally more linear than some of the spider/spring systems in use at the time. It was capable of quite a large linear excursion for its day. His first model, the AR-1, got quite clean low bass out of a modest little box and made hi-fi systems palatable to those who didn't have huge rooms to dedicate to their hobby.

Of course, he sacrificed a lot of sensitivity for this, so the AR speakers sort of kicked off the trend toward bigger power amps in hi-fi systems...

Anyway, just a tidbit for those of you who probably don't care, about another type of fairly common sealed box. I bet they're occasionally used for instrument amplification too, but the low sensitivity probably makes them very unpopular.

 

[Mr. Foxen]

I bugs the he'll out of me that Orange market these cabs that way. There's already enough bullsh1t in loudspeaker marketing without Orange going out of their way to destroy their credibility with anyone who actually knows a little bit about speaker design.

Orange has always been marketing first, it is most of the point of being orange.

 

[Arjank]

Has anyone USING these Orange ISOBARIC cabs got any opinions??

I don't see the advantages with bassguitar cabs.
The isobaric principle was used in some hifi speakers in the 80's e.g Dynaudio and Linn.
But since the invasion of the bycicle-tire-suspension-woofers and amplifier power is plenty available, Isobaric is not needed to produce clean low bass out of a small cabinet.
There are two advantages with Isobaric:
1.it is claimed they have lower 2nd order harmonic distortion(only when drivers are mounted face to face or back to back)
2.Vas is halved because the cone mass in doubled, this means a cabinet size half of the normal size.

Point 2 is actually pretty pointless for a compact basscabinet since the couple chamber between the front and inner drivers will take up some of volume.

A well designed bycicle-tire-suspension-woofer can do that too.
Isobaric sounds great as a marketing word, thats probably why they used it (selling more cabs) no offense.
Just my 2 cents.