K43 Effeciency

[NJbob]

Can anyone tell me what the effeciency of the LS with the K43 is. I found out my pr had them instead of the K33. I was wondering because of the bad performance of my 2a3 amp.

I measured the drivers they were all 5.9 to 6.1 ohm

Thanks

[Guest " "]

I have this in my k-43 driver info folder - this was previously posted on the forum but is hard to find

K-43 spec

 

TSPs

Fs 36 Hz

Re 3.4 Ohms

Qts 0.314

Qms 5.314

Qes 0.333

Vas 198.474 L

Sd 0.089 m^2

Xmax 0.29 in

BL 15.94

 

It is a 400 Watt woofer with a Sensitivity of 98.5

@ 2.83V/1M. Freq response is 45 to 3,500 Hz and has a 3 in voice coil

[Guest " "]

One of many for compare

PART

#  K-33

RE OHMS

3.39

LE

MH  .96

FS

HZ  34.46

QE  .410

QM  7.39

QT  .390

VAS

LTRS 301.66

XMAX

MM  8.20

BL

TM  11.88

MMS

GMS  78.59

CMS

mm/N .2714

RMS

NS/M 2.3037

SD

SCM  889.59

EBP  84.4

EFF

%  2.91

SPL

dB  96.6

Wattage

 150rms

[Guest " "]

here's one for the k-33-e to compare

Mfg: Klipsch

Mdl: K-33-E

Nomz: 4 Ohms

Revc: 3.5 Ohms

Levc: 1 mH

SPLo: 92.3

SLPi: 91.13

SLPi: 91.71 @ Vg = 2V

Qms: 8.5

Qes: 0.684

Qts: 0.633

no: 1.07%

ni: 0.81%

F0(Fs): 27.99 Hz

Fi: 26.17 Hz

BL: 9.77 Tm

Sd: 0.089 M^2

Vas: 0.343 M^3

Xmax: 4.00 mm

Cms: 305 uM/N

Mms: 106 g

Pmx: 100 W

 

[Guest " "]

some more for the k-33 for compare purposes

PART # K-33

 

RE OHMS 3.39 FS HZ 34.46

LE MH .96 MMS GMS 78.59

QM 7.39 CMS mm/N .2714

QE .410 RMS NS/M 2.3037

QT .390 VAS LTRS 301.66

XMAX MM 8.20 SD SCM

889.59

BL TM 11.88 EBP 84.4

EFF % 2.91 SPL dB 96.6

Wattage 150rms

 

1981 k-33

Re = 3.39 Ohms

Zmax = 46 Ohms @ Fs = 35

Hz

Ro = 46/3.39 = 13.57

Z = Re*SQRT(Ro) = 3.39 *

SQRT(13.57) = 3.39*3.683=12.5 Ohms

Fh=49Hz @ Z=12.5 Ohms

Fl=25Hz @ Z=12.5 Ohms

check >> SQRT

(Fh*Fl) = SQRT (49*25) = 35Hz = Fs (good numbers)

 

Here are the T/S

parameter calculations-

 

Qms = Fs * SQRT(Ro) / (Fh

- Fl) = 35* SQRT(3.68) / (49-25) = 5.37

Qes = Qms / (Ro-1) = 5.37

/ (13.57 - 1) = .427

Qts = Qms * Qes / (Qms +

Qes) = (5.37 * .427) / (5.37 + .427) = .395

 

[colterphoto1]

You might have the LS Industrial version there. They came stock with the K43 woofers.

[Guest " "]

Can anyone tell me what the effeciency of the LS with the K43 is. I found out my pr had them instead of the K33. I was wondering because of the bad performance of my 2a3 amp.

I measured the drivers they were all 5.9 to 6.1 ohm

Thanks 

 

I sent you an email about the LaScala senerio that uses the K-43, which normally includes the AL xover.  If you want to use the LaScala's with a low power amp, best bet would be to put some AA or A xovers in them.  While a lot of home users do not like the AL, I think it has it's place with high powerd amps in high output senerios.

[NJbob]

So it looks like I had it backward

[Guest " "]

"You might have the LS Industrial version there. They came stock with the K43 woofers."

I had a set of regular 1976 LaScala's that had K-43's in them, but of course, they may have been installed later in the game.