In order for there to be any "damping factor" issues, there has to be
something to damp that mainfests itself in the electrical domain, i.e.,
it has to show up in the impedance curve as a resonant peak. Second,
the electrical LOSSES (not IMPEDANCE, resistive LOSSES) that form the
effective series electrical loop with the tweeter HAVE to dominate all
other losses.

In point of fact, your conjecture fails on several fronts: first, in the
vast majority of tweeters, bay far the most dominant loss mechanism is
mechanical, either through suspensions losses or deliberately through
fluid viscous losses. This is precisely why the mechanical Q, Qms, of
most tweeters is equal to or less than the electrical Q, Qes.


Dick,

how would a tweeter like the Peerless conetweeter CT62H perform? I
currently use it in an active system, but use a 2.2 ohm resistor in
series with the tweeter. This is said to elevate the highs a little
due to the rise in impedance 10 kHz (which I want), and putting a
resistor in series may also reduce some sort of distorsion (going from
voltage to current drive???). I don't really know how this works (or
the theory behind it) and how it would apply to a tweeter with quite
different electrical/mechanical characteristics than "normal" tweeters
(e.g. QesQms).

The values a

CT 62 H
Thiele Small parameters:
Nominal impedance Zn (ohm) 8
Minimum impedance/at freq. Zmin (ohm/Hz) 6.6/2600
Maximum impedance Zo (ohm) 6.9
DC resistance Re (ohm) 6.1
Voice coil inductance Le (mH) 0.1
Resonance Frequency fs (Hz) 1500
Mechanical Q factor Qms 0.89
Electrical Q factor Qes 7.07
Total Q factor Qts 0.79
Mechanical resistance Rms (Kg/s) 3.01
Moving mass Mms (g) 0.28
Suspension compliance Cms (mm/N) 0.04
Effective cone diameter D (cm) 3.7
Effective piston area Sd (cm²) 10.8
Force factor Bl (N/A) 1.5
Reference voltage sensitivity
Re 2.83V 1m at 2600 Hz (Measured) (dB) 90

Magnet and voice coil parameters:
Voice coil diameter d (mm) 13
Voice coil length h (mm) 1.8
Voice coil layers n 2
Flux density in gap B (T) 1.0
Total useful flux (mWb) 0.1
Height of the gap hg (mm) 2.5
Diameter of magnet dm (mm) 40
Height of magnet hm (mm) 7.5
Weight of magnet (kg) 0.04

Power handling:
Long term Max System Power (IEC) (W) 100