Best sub for clarity?

[thaster 10+ year member]

http://cgi.ebay.com/2-image-dynamics-idq-12s-4ohm-svc_W0QQitemZ150254313760QQihZ005QQcategoryZ18803QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

*If you don't know, don't speculate.

If you wish to know, seek knowledge

If you do know, speak up and teach the world*

those are v.1. here's the image dynamics store. http://www.imagedynamicsstore.com/idstore/

 

[Electrodynamic 10+ year member]

If you need something right his minute, knock the Mag off your list. They're being made right now but won't be in for another couple weeks.

 

[PuZo 10+ year member]

those are v.1. here's the image dynamics store. http://www.imagedynamicsstore.com/idstore/

They only have 10's, I think I want a 12

Im thinking of getting the JL W6's

heres the link for the idq subs, but they only have v2

http://www.imagedynamicsstore.com/idstore/-c-21_33.html

 

[Cmonster 10+ year member]

Go with the IDQ

 

[thaster 10+ year member]

here's the idq v.3 12 inch. http://woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=6225 this site is also an authorized dealer so buy it from them if image dynamics dont have it.

 

[JohnEJanowitz 10+ year member]

kinda late to this thread, but here are a couple other links about drivers and "clarity." When I think of clarity, a lot has to do with low distortion, a lot with the proper alignment for the application. As Electrodynamic posted the link, this applies to the so called "acceleration factor" of the woofer. A paper titled Bl/Mms - Nonsense explains the flaw in this.

http://web.archive.org/web/20010810141852/lambdacoustics.com/library/whitepapers/bl_mms.htm

The "speed" of the woofer is directly equal to the frequency being played. The fastest woofers are the ones that can play the highest frequencies. This has nothing to do with size and actually nothing to do with mass. Our TD15M can play upwards of 4KHz on axis and sounds better at these frequencies than the 10" or 12" version. The reason in this case is due to the cone profile on the 15" driver. The reason all of these drivers can play so high is due to their extremely low inductance. The TD drivers may very well have the lowest non-linear distortion of any driver ever manufactured. Again, here is a brief overview of the Lambda motor, but it explains a lot about woofers and distortion in general. http://www.aespeakers.com/Lambda001-1.php

John

 

[donpisto 5,000+ posts]

kinda late to this thread, but here are a couple other links about drivers and "clarity." When I think of clarity, a lot has to do with low distortion, a lot with the proper alignment for the application. As Electrodynamic posted the link, this applies to the so called "acceleration factor" of the woofer. A paper titled Bl/Mms - Nonsense explains the flaw in this.
http://web.archive.org/web/20010810141852/lambdacoustics.com/library/whitepapers/bl_mms.htm

The "speed" of the woofer is directly equal to the frequency being played. The fastest woofers are the ones that can play the highest frequencies. This has nothing to do with size and actually nothing to do with mass. Our TD15M can play upwards of 4KHz on axis and sounds better at these frequencies than the 10" or 12" version. The reason in this case is due to the cone profile on the 15" driver. The reason all of these drivers can play so high is due to their extremely low inductance. The TD drivers may very well have the lowest non-linear distortion of any driver ever manufactured. Again, here is a brief overview of the Lambda motor, but it explains a lot about woofers and distortion in general. http://www.aespeakers.com/Lambda001-1.php

John

I'm not sure if I'm understanding correctly, but are you stating that the subwoofer you are mentioning plays up to 4 KHz? If so, why would would it be necessary to have a subwoofer play that high? Just wanting some clarification, hope it doesn't seem as though I'm coming off rude.

 

[mokedaddy 5,000+ posts]

I'm not sure if I'm understanding correctly, but are you stating that the subwoofer you are mentioning plays up to 4 KHz? If so, why would would it be necessary to have a subwoofer play that high? Just wanting some clarification, hope it doesn't seem as though I'm coming off rude.

Throw some 15s in the kick on axis and just run a set of tweets. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I think this actually would have much more practical use in pa skeakers or h/t.

 

[JohnEJanowitz 10+ year member]

I'm not sure if I'm understanding correctly, but are you stating that the subwoofer you are mentioning plays up to 4 KHz? If so, why would would it be necessary to have a subwoofer play that high? Just wanting some clarification, hope it doesn't seem as though I'm coming off rude.

No problem at all. The particular woofer I'm talking about is more of a midbass woofer. We use them in PA systems, studio monitors, large home theaters, etc from say 45Hz on up. The high bandwidth up to 4KHz gives a lot of room for crossover and allows for lots of options to mate to on the top end. Our other TD woofers have similar characteristics and can be used up to 2KHz or so and are used for woofer and subwoofer use. You may not need the high frequency extension, but it's not a bad thing either. You do want the other benefits that come with the copper shorting ring though, low inductance, linear inductance, low distortion, better heat dissipation, etc. As the other paper mentions, how "fast" a woofer is really depends mainly on how high it can play as speed is proportional to frequency. A woofer that can play 2KHz accurately can play quite well at any frequency needed for woofer use as well.

Also, in most cases you want a woofer that is clean electrically to several octaves above the highest frequency you are going to use it. This does apply to car woofers as well, especially with so many of the huge, high inductance coils out now days. Our old HE15 made by TC sounds had inductance so high that it would actually have a big peak at 75Hz and roll off quickly after. In this range, distortion skyrocketed and there was quite a resonance. It's a good idea to have a woofer that is electrically flat up to the point where your xover is going to be 48dB down. This means if your xover is 75hz at 24dB, you want it electrically flat up to 300Hz or higher. This means that the xover will work properly without a lot of phase shift caused by the inductance, and without distortion added by inductive rise.

Linear inductance with excursion is also a very important point. You want the core inside the VC to be the same at all excursions.

John

 

[donpisto 5,000+ posts]

Thanks for the clarification John, I figured that it was more for a midbass driver. You guys have some nice products. In the future I'll probably order the IB 15 and possibly some PR's. Love the specs on the IB15, especially that 16 Hz Fs //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif. Awesome pricing as well.

 

[req 5,000+ posts]

IDQ or GTi.

how about IDQ IN a GTi

//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[audioholic 5,000+ posts]

how about IDQ IN a GTi

//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

Gawd no!!!
//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[PuZo 10+ year member]

what do all the ohms mean? I know its resistance, but is 1 ohm better than 4, better than 8?

 

[bose301s 5,000+ posts]

kinda late to this thread, but here are a couple other links about drivers and "clarity." When I think of clarity, a lot has to do with low distortion, a lot with the proper alignment for the application. As Electrodynamic posted the link, this applies to the so called "acceleration factor" of the woofer. A paper titled Bl/Mms - Nonsense explains the flaw in this.
http://web.archive.org/web/20010810141852/lambdacoustics.com/library/whitepapers/bl_mms.htm

The "speed" of the woofer is directly equal to the frequency being played. The fastest woofers are the ones that can play the highest frequencies. This has nothing to do with size and actually nothing to do with mass. Our TD15M can play upwards of 4KHz on axis and sounds better at these frequencies than the 10" or 12" version. The reason in this case is due to the cone profile on the 15" driver. The reason all of these drivers can play so high is due to their extremely low inductance. The TD drivers may very well have the lowest non-linear distortion of any driver ever manufactured. Again, here is a brief overview of the Lambda motor, but it explains a lot about woofers and distortion in general. http://www.aespeakers.com/Lambda001-1.php

John

Yes, but if the woofer makes a "slow" transition from the forward to rearward stroke or vice versa you will get distortion. If the driver snaps from one direction to the other it will have less distortion. This is accomplished easily through BL linearization techniques like XBL^2 employed in the new Stereo Integrity drivers. I am not doubting that your drivers are good, but Nick does know what he is talking about quite well. Also, that lambda motor doesn't look much different from a standard overhung design with a copper shorting ring.

 

[bose301s 5,000+ posts]

what do all the ohms mean? I know its resistance, but is 1 ohm better than 4, better than 8?

No ohm rating is inherently better than any other. You need to look t your goals, how many drivers you will run and what amp and decide what to buy from there to get the correct power delivered.