Which is a better K33E

[Rhadamanthus]

Should I replace the old square magnet K33E with a new round magnet K33E?

Is one better than the other?

I like the funky look of the square magnet, sure, you can't see it in there, but you know which one is in there.

The square one seems to have a bit more weight to it.

One of the old ones has a 1inch cut in it, that is why it may be replaced.

Any thoughts?

[TBrennan]

I doubt there's any difference, evidently PWK didn't think so because I had a pair of Cornwalls with one round magnet K-33 and one square magnet one.

[Rhadamanthus]

One round and one square one would bug me to death! Do you still have them, or did you move them out?

[Jeff Matthews]

Were the speakers good with 2 good round magnets? If you'll be bugged by having 1 of each, get round.

[Rhadamanthus]

Were the speakers good with 2 good round

magnets? If you'll be bugged by having 1 of each, get round.

So, you would say the round magnet type are better than the square?

[Jeff Matthews]

I have no idea. I was only suggesting that if it would bug you to have 1 of each, and if the speakers were good when both rounds were functional, then get a matching round. That way, the speakers will sound good and you will not be bugged by having 1 of each.

If you let somebody get it in your head that square is better, I bet you get caught up and wind up buying 2 squares to match - paying alot more than you planned for speakers that would have been just fine by replacing only the 1 magnet that you need.

At the link below, you can read up a little on magnets and maybe post your specific question. The only thing I got out of it is AlNiCo magnets are preferred because they produce a smoother sound.

http://www.webervst.com/sptalk.html

[jwc]

Should I replace the old square magnet K33E with a new round magnet K33E?

Is one better than the other?

I like the funky look of the square magnet, sure, you can't see it in there, but you know which one is in there.

The square one seems to have a bit more weight to it.

One of the old ones has a 1inch cut in it, that is why it may be replaced.

Any thoughts?

I would take your square magnet one that has a cut in it and send it to bob crites for repair. These square magnets ones have a lower Fs. Theoretically there is a lower response. The round magnet came out after the Cornwall production ceased.

[Jeff Matthews]

I thought you had said you had 2 round and that 1 was bad. That's why I was saying get another round. Now that I reread your original post, get another square. J.W. had a good suggestion. BTW, you never said there was anything wrong with the way the speaker performs. If there is not, I'd leave it alone.

[djk]

Square is less efficient use of material from a magnetic standpoint.

The original magnets were square because the top and back plates were square.

When they became able to punch round top and back plates out of 3/8" steel they went to round magnets.

BEC measured three K33E drivers, two old square, one new round. The average efficiency of the square was 2.36% vs 2.44% for the round. This is a difference of 0.14477823368622843625092129222177dB in favor of the round. (Fs^3*Vas*0.00000277)/Qes , Vas is in cu ft.

The low frequency cut-off for vented boxes based on (Fs/Qes)*0.312 is 26hz on the average of the square woofers, and 27hz for the round. In a sealed test box the three drivers were within ±2hz of the average sealed box Fc.

Even though the measured parameters of all three drivers varied greatly, we can see from the above that they are substantially equal.

Klipsch issued a DFH note saying the newer K33E was an improvement over the old one. I would agree for the reason that the new dustcap makes less noise at higher volumes.

[Rhadamanthus]

Square is less efficient use of material from a magnetic standpoint.

The original magnets were square because the top and back plates were square.

When they became able to punch round top and back plates out of 3/8" steel they went to round magnets.

BEC

measured three K33E drivers, two old square, one new round. The

average efficiency of the square was 2.36% vs 2.44% for the

round. This is a difference of 0.14477823368622843625092129222177dB in

favor of the round. (Fs^3*Vas*0.00000277)/Qes , Vas is in cu ft.

The

low frequency cut-off for vented boxes based on (Fs/Qes)*0.312 is

26hz on the average of the square woofers, and 27hz for the round. In a

sealed test box the three drivers were within ±2hz of the average

sealed box Fc.

Even though the measured parameters of all three

drivers varied greatly, we can see from the above that they are

substantially equal.

Klipsch issued a DFH note saying the newer

K33E was an improvement over the old one. I would agree for the reason

that the new dustcap makes less noise at higher volumes.

Thank you, that is the kind of information I was looking for.