These are very nice! Mine are usually held together with liquid nails on construction grade 3/8" plywood. 
Is the Mundorf thingy a thermister or fuse? A tweeter protector?
Is the Mundorf thingy a thermister or fuse? A tweeter protector?
It's a copy of the Dutch Tonemaster design. So just Klipsch like in the wooden plank style and simplicity. Whatever issues it might have I don't know of. Still have to build the speakers.
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Resistor in parallel with the hf compression driver:Stabilizes (flattens) the driver’s impedance
Every compression driver has an impedance curve that:
- Peaks around its mechanical resonance (fs),
- Rises at higher frequencies due to voice‑coil inductance.
A big Rp in parallel will:
- Dampen the resonance peak (lowering its Q),
- Limit the high‑frequency rise,
- So that Z₍parallel₎ = (Z₍driver₎ · 20 Ω) / (Z₍driver₎ + 20 Ω)
— you end up with a much more “constant” Z around your crossover region, which keeps your filter slope and crossover point where you designed them.
3. Damps unwanted resonances
By giving the driver a resistive load at frequencies where its own impedance spikes, the shunt resistor absorbs some of the stored energy in mechanical/acoustic resonances. This:
- Smooths out breakup modes or driver‑ringing,
- Yields a flatter on‑axis response,
- Improves directivity control.
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I know all that, good summary though. What I was surprised by was the two legged transistor. I've never seen a resistor in that form before. Well, maybe I have, but I didn't know what it was until now. Thanks.
Ah OK. Now understand. I was thinking what is he on about.
Copper-manganin foil resistors ... New to me too.
Copper-manganin foil resistors ... New to me too.
There are several resistors in FET style cases. Caddock(black), Mundorf(Grey), Vishay (blue), just to name a few.