JBL 2206H vs. Lambda TD12M

[Defo]

Gonna downsize from my JBL 2226H to something smaller, considering my room size.

They dont need to go very deep, 50hz or so will do.. BUT they have to be quick enough to keep up with my horns.

Pros and cons of each driver?

 

[John_E_Janowitz]

This comparison has come up a few times lately. I'll give you a couple links to my responses regarding the comparison.

Originally the comparison came up in the following thread. You can read my response and the rest of the thread if you want.
http://www.avsforum.com/avs-vb/showpost.php?p=15940399&postcount=221

We got a little more into some of the specifics on page 2 of this thread here:

http://www.avsforum.com/avs-vb/showthread.php?t=1127393&highlight=2226h&page=2

In general the TD12M will have better power handling/power compression due to the way the copper sleeve pulls heat from the coil. It will have cleaner high frequency extension as there is no dustcap breakup and a much better damped cone breakup. High frequency extension is also much higher due to the lower inductance. The lower and more linear inductance also means, much lower distortion due very little change in Le with excursion and greatly lowered flux modulation. All in all there isn't much of a comparison.

John

 

[MisterTwister]

is there a reason, besides cost, why manufactures don't use ferrofluid for cooling woofers' coils?

 

[badman]

Possibly due to excursion related fluid displacement

Or that most woofer failures are from overexcursion, not heat.

 

[planet10]

is there a reason, besides cost, why manufactures don't use ferrofluid for cooling woofers' coils?

I believe that a few do. But in a woofer you have issues of heat & excursion trying to send the ferrofluid thru the dustcap into the outside world, so it is not as easy to do, and requires a different formulation.

dave

 

[Defo]

This comparison has come up a few times lately. I'll give you a couple links to my responses regarding the comparison.

Originally the comparison came up in the following thread. You can read my response and the rest of the thread if you want.
http://www.avsforum.com/avs-vb/showpost.php?p=15940399&postcount=221

We got a little more into some of the specifics on page 2 of this thread here:

http://www.avsforum.com/avs-vb/showthread.php?t=1127393&highlight=2226h&page=2

In general the TD12M will have better power handling/power compression due to the way the copper sleeve pulls heat from the coil. It will have cleaner high frequency extension as there is no dustcap breakup and a much better damped cone breakup. High frequency extension is also much higher due to the lower inductance. The lower and more linear inductance also means, much lower distortion due very little change in Le with excursion and greatly lowered flux modulation. All in all there isn't much of a comparison.

John

Seems like the Lambda driver is my best bet.. BUT are they ready to be shipped imidietly? Think ive read somewhere that it may take a while from the actual order, to the driver is at my door due to Acoustic Elegance being very busy lately. Im worried because when I sell my 2226H drivers, im without sound untill the new drivers arrive..

 

[454Casull]

I believe that a few do. But in a woofer you have issues of heat & excursion trying to send the ferrofluid thru the dustcap into the outside world, so it is not as easy to do, and requires a different formulation.

dave

Has anybody tested the practical excursion limit for ferrofluid filling?

 

[badman]

Make sure you use a polycone if you're going to test excursion vs. ferrofluid displacement. Would be a shame to soak magnetic fluid into the paper cone

 

[planet10]

Would be a shame to soak magnetic fluid into the paper cone

One of the ways you check to see how much abuse an Advent tweeter has had.

dave

 

[badman]

One of the ways you check to see how much abuse an Advent tweeter has had.

dave

Hey, did you measure motor strength related to this? I'd think it'd act as a brake to motion in one direction and an enhancement in the opposite (Presumably it would 'pull' towards the polepiece), probably increasing even order distortion quite a bit.

Any observable effects related to this you noted?

 

[planet10]

Hey, did you measure motor strength related to this? I'd think it'd act as a brake to motion in one direction and an enhancement in the opposite (Presumably it would 'pull' towards the polepiece), probably increasing even order distortion quite a bit.

Any observable effects related to this you noted?

Never measured any of this. The comment was ref that if you start overcooking the tweeter, the ferrofluid starts to boil and tries to escape thru the dustcap, leaving a very visible brown discolouration.

dave