MPP

I have an old friend as a guest today. A 20 year old Caldera that i have updated and repaired. Lets see how that sounds.
 

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The Calderas may be a bit too honey dipped in the fundamental tones and i have heard more squiky clean and focussed but man, do this ancestors have space and SOUL.
Volume is more then enough with my 20W class A amp.
This is still a very modern concept : Linear Phase, fully modular, pneumatic baffle. The cabinets are made from " dancing floor ", a sandwich material with a soft internal layer.
The midrange cabinet has a steel double cross that is tunable.
Of cause i made some changed, substituted the Scan Speak 29mm soft dome with a modern ring radiator and the woofers have a proper rubber surround now. But still i am surprised about how much thought and innovation went into this speaker.
 
Are you also using a feedback capacitor?

I assume that you are using +/-5V supplies with decoupling caps caps close by, but I can't figure out the other two resistors that don't seem to be the where the feedback resistor would be.


I am using the ADA4898. That chip can drive very low impedance so i use a 100 Ohm feedback resistor. That gives with my Titan i 100/6 = 16,66..
 
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