posted
Decided to start a new topic on this cuz I just thought of something..
I was reading the post about isobaric loading...and I noticed that buzz said:
"The other largest advantage to this design is that it compensates for the speakers inherent non linearities."
I've read this on jl's site about the non linearities, i think....and I was wondering...would an isobaric load make for better sq?
How noticeable are these "non linearities" on a regular loaded box...not iso?
Also...I've heard that iso loading actually is 3 db's less than a single sub at X wattage. In order for and iso load to be as loud as a single...would you also have to double the watts?
1 sub @ x watts = 2 subs iso @ 2x watts?
does that sound right?
thanx
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Posts: 213 | From: Carriere, MS, US | Registered: Jun 1999
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posted
Due to most speakers having their magnetic centers and suspension centers in different places the way a speaker moves forward and backward can be different. If you mount one speaker backwards on top of the other and you couple those two together, they should behave the same forward and backward. Although I've used iso mounted subs for years I have no idea if this makes any noticable difference.
You do lose 3 db if you keep the same wattage because you double the mass of the speaker, so you do have to double the power to keep the same output.
posted
Hmmm, I've never noticed a loss. You may double mass, but you doubled motor too... I've always subscribed to an iso loaded pair having the same output for the same power, and only the reduced box as the benefit.
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And that's the bottom line, cuz: LORD DUKK SAYS SO!
The Big Show The Dukk says: Know your bass: PORT your damn box!! Have HoleSaw, Will Travel!
posted
I never noticed a difference either but this was a couple years ago and I never had them go head to head. I was going on a test report from a couple years ago and now that I think about it I think they were talking about the difference between using two subs regular and two iso.
posted
Yes, ISO is better for Sq, in some cases. Depends on the response curve of the woofers anechoeically . A superior woofer ISO'd will only sound like a standard superior woofer. A standard woofer, however, will reap huge benefits from ISO, due to things mentioned above. In theory, you DO lose 3Db from the ISO load, however, in practice, I've only noticed power loss when you had to wire in series for impedance purposes. By the way, I found that the Pioneer 10" subs respond VERY well when ISO mounted, in .75f3 sealed and stuffed. Played very deep, very powerful, and plenty loud for Sq.
------------------ If it dont fit, force it... if it breaks, it needed to be replaced anyway... members.tripod.com/Audiophyle
Posts: 3120 | From: nowhere | Registered: May 1999
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posted
One of the downsides I Have heard with the ISO is the fact that the subbass sometimes doesn't seem as "punchy". Like when a drummer hits the bass drum, you get some harmonics in there as well as the regular frequency. When you have a driver face to face with another driver, you lose some of that.
As far as advantages, it used to be that you could get away with a smaller box. With the volume requirements of the new subs out on the market, its pretty pointless to use an ISO setup (just look at how many of these setups you see today versus like 5 or 10 years ago).
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