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Thermionic 3 question [message #91396] Fri, 31 January 2020 04:34 Go to next message
ecc82 is currently offline  ecc82
Messages: 3
Registered: January 2020
Esquire
I have an old Thermionic 3 speaker with the PSD2002 compression driver and
would like to change this driver to an DE250 B&C .
My question is, which crossover parts I have to change.

Thank you very much

Frank
Re: Thermionic 3 question [message #91398 is a reply to message #91396] Fri, 31 January 2020 09:23 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17659
Registered: January 2001
Illuminati (33rd Degree)

It'll swap right over. But change the R1/R2 parts to reduce the tweeter 2dB. See the following chart for values:
Re: Thermionic 3 question [message #91400 is a reply to message #91398] Fri, 31 January 2020 15:13 Go to previous messageGo to next message
ecc82 is currently offline  ecc82
Messages: 3
Registered: January 2020
Esquire
Hello Wayne,
Thank you very much for the resistor chart.
What is about the capacitor?
Is it required for the DE250?

Frank
Re: Thermionic 3 question [message #91401 is a reply to message #91400] Fri, 31 January 2020 15:55 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17659
Registered: January 2001
Illuminati (33rd Degree)

You won't need to change the capacitor unless you upgrade the radial horn to our H290C waveguide. If you do that, you'll remove the 0.47uF capacitor R1 and install a 16Ω resistor Rs.
Re: Thermionic 3 question [message #91402 is a reply to message #91401] Fri, 31 January 2020 16:21 Go to previous message
ecc82 is currently offline  ecc82
Messages: 3
Registered: January 2020
Esquire
Wayne,
Thanks for your support.

Frank
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