Yes, this is part of my DNA! 😀
Yes, that is true. An undesirable outcome of the digital world, I guess. 🙁
Andy
the output impedance of this attenuator is roughly 6k8.
This requires a VERY low capacitance after the attenuator.
You will need to check the receiver RF capacitance to ensure it is compatible.
Fitting the two resistors inside the RCA/Phono plug is normal and easy and the best place for them. Label the plug so that you know what you are plugging in many months/years later.
This attenuating cable must have the resistor plug at the receiving input socket, not at the send end.
Thanks.
Stupid question maybe: how do I know what's the receiver RF capacitance? What happens if said capacitance is too high?
Also, the send end plugs would have a 400Hz/12dB RC filter included. In order to calculate the values, should I take in account the value of the resistors in the attenuator plug? Or just the 47K input Z of the receiving amplifier? Or both?
Thanks a lot for your answers... ��
A filter need both an impedance to the flow and another impedance to the return.
eg CR or LR or RC or RL or CL or LC Notice that in all of the options, there is one or more reactive components.
How did your plug achieve a 400Hz filter?
Look at the sch for the receiver and at the input. If there is some reactive component there you should be looking at what filter type it creates.
eg CR or LR or RC or RL or CL or LC Notice that in all of the options, there is one or more reactive components.
How did your plug achieve a 400Hz filter?
Look at the sch for the receiver and at the input. If there is some reactive component there you should be looking at what filter type it creates.
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I think you misunderstood what I wrote.
In short (see my separate thread) I need a cable that does 400Hz low-pass filter (2nd order) and 12dB fixed attenuation in the same cable. Kind of a custom made F-mod low-pass filter followed by a custom-made Rothwell in-line attenuator, linked by 50cm VDH D102 cable. The end goal is to completely replace my active crossover with passive filters included in the cables. I only need 2nd order filters, and it's a bi-amped system so I have no need for anything more compilcated or flexible. I want custom filters for the amps I'm currently using and I want them as transparent as possible.
I've never done such a thing before but theorically it seems feasible...?
too complicated and too big to fit inside an RCA phono plug.
My suggestion - forget going passive, inside a plug.
My suggestion - forget going passive, inside a plug.
The noise from minidsp is analog noise from output stage of the dac.
Digital noise is at -144 dB, analog at -100dB. Lowest distortion is at -20 dBFS
I guess the noise is from the poweramp, that has too much gain for your needs. X25 cant take much more than 10 volts. And that is loud at normal distances.
So maybee wasting some watts into powerresistor before the x25 tweeter will kill the noise?
Fineadjust the volume in the minidsp
Digital noise is at -144 dB, analog at -100dB. Lowest distortion is at -20 dBFS
I guess the noise is from the poweramp, that has too much gain for your needs. X25 cant take much more than 10 volts. And that is loud at normal distances.
So maybee wasting some watts into powerresistor before the x25 tweeter will kill the noise?
Fineadjust the volume in the minidsp
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