Just in case somebody here has already done the hard work.
Would anybody have the values for the cored inductors in this old RadioShack 3-Way crossover?
I am assuming they are book values for 8R drivers but just in case they are not.
I an trying to insert a 100mm midrange into a big 2-Way and wondering if I can utilise this old unit and not go out and order more parts
Would anybody have the values for the cored inductors in this old RadioShack 3-Way crossover?
I am assuming they are book values for 8R drivers but just in case they are not.
I an trying to insert a 100mm midrange into a big 2-Way and wondering if I can utilise this old unit and not go out and order more parts
I never got the manual, these came as part of a gifted bundle of parts many years ago.
I was guestimating based on book values but thought it was worth asking.
I was guestimating based on book values but thought it was worth asking.
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I thought so and I wish this picture would zoom better. There are a few different ways you could measure.
Instead here's a thought. What if you assumed the filters were either 0.5 or 0.7 and they were designed for eg an 8 ohm resistor. This would let you use the capacitance values to work out a specific range for the inductor values?
Instead here's a thought. What if you assumed the filters were either 0.5 or 0.7 and they were designed for eg an 8 ohm resistor. This would let you use the capacitance values to work out a specific range for the inductor values?
I may have the RadioShack book by Weems somewhere [ most probably in the shed] so if I know the XO frequencies I can work it out.
XO points will be a lot higher than I usually use but I may be able to use it for the midrange to tweeter divide, save me going shopping.
XO points will be a lot higher than I usually use but I may be able to use it for the midrange to tweeter divide, save me going shopping.
For example say the capacitor (in a high pass) was 4.7uF Now you know that it could be...
Butterworth into 8 ohms at 3kHz with an inductor of 0.6mH, or..
LR at 2,100Hz with an inductor of 1.2mH
Butterworth into 8 ohms at 3kHz with an inductor of 0.6mH, or..
LR at 2,100Hz with an inductor of 1.2mH
I found the old RadioShack book
XOs at 800/1600 and 5k/7k
Basically unusable for what I want to do with 8R drivers. However I may be able to use it in the future with some of those throwaway 70mm HTiaB drivers that seem to multiply in dark corners. Not worth listing for sale in eBay without the boxes and paperwork
XOs at 800/1600 and 5k/7k
Basically unusable for what I want to do with 8R drivers. However I may be able to use it in the future with some of those throwaway 70mm HTiaB drivers that seem to multiply in dark corners. Not worth listing for sale in eBay without the boxes and paperwork
If I can find some cheap panels it might be "fun" to use this XO as it is and build one of those old speakers just to have on the shelf as a comparison model. One of those that had the bass woofer and the mid woofer sharing the same box perhaps even.
I do happen to have some of those old drivers sitting around after all.
I do happen to have some of those old drivers sitting around after all.
I needed a new DMM so I paid a few dollars more and got one with an inductance meter built in.
My quick calculations based on book values were close enough so my arithmetic hasn't got any worse
My quick calculations based on book values were close enough so my arithmetic hasn't got any worse