I bought a pair of Heresy I's from an estate sale recently. I already have a pair of Heresy II's and KG4's so my purpose was to restore these and sell them. They weren't taken care of all that well and even had stickers on them it looked like they had been used in a mechanic's shop and the stickers made them look like something from NASCAR. The grill cloths were ripped in a couple of places and one of the emblems were missing. I was able to use goo be gone and get the stickers off cleanly, some light sanding and stain cleaned up the wood nicely. I was able to get new grill cloth from Bob Crite and an emblem from eBay, so cosmetically they are great now.
One of the drivers had a small puncture and a rip in the surround. (pic attached) My thought was to 1) re-cone, 2) find a user driver on eBay or elsewhere, 3) Use a new Crite woofer or 4) search the internet for a K-22 "clone" that would work in it's place. Option 1 was seriously considered, used drivers were tough to find and somewhat costly compared to what I had spent already, the Crite woofers were incredibly expensive. So I ended up searching dozens of sites that sold raw drivers and eventually found one that was virtually an exact match.
I found the T/S parameters for the K-22 as follows:
NomZ=8 Ohm Re=6.9 Ohm Le=1 mH Qms=5.3 Qes=0.446 Qts=0.411 Fres=35 Hz Cms=359 uM/N Mms=57.6 Grams BL= 14 TM Sd=.053 square meters = 62 Sq Inches Vas= 143 Liters = 5.05 CuFt Xmax= 4mm Pmax= 100Watts SPL=93 dB @ 2.83V
The driver I found has T/S as follows:
Sensitivity: 96dB (W/M)
Impedance: 8ohm
Re: 7.2ohm
Le: 1.213mH
Frequency response:
48Hz~3KHz
Fs: 48Hz
Qts: 0.39
Qes: 0.428
Qms: 4.5
Vas: 94.5 liters
Xmax: 7mm
Overall frame diameter: 12.28"
Required cutout: 11.06"
Mounting depth: 5.00"
This was as close of a match as I could find with any driver and the price was definitely right. I bought the driver to replace the one that was damaged. I installed it and the sound was great. But - here is the point of this post...........since my place is to sell the speakers, how does mis-matched drivers affect the value? If I were to keep the speakers, I would replace the K-22 with the new driver because personally I thought it sounded better. But to the person that would buy a vintage Hesesy, would having non-Klipsch drivers severely affect the value? What should I do to maximize the resale value?
I've attached pics. The black driver is the new one and the grey driver is the original K-22.