Your journey with lower-watt tube amps -- Can a kit be good enough?

Again, in a nutshell: They shine when not presented with bass or asked to make much power.  I've already explained why they sound good when they do so.

@atmasphere Ralph, I'd like to test that with the implementation of my SETS (I've got the low power part covered with high efficiency speakers and modest listening levels). So I figure I need to split the audio signal before it gets to the SET and create one for the SET and one for my powered subwoofers. The first being treated with a high pass filter and the latter a low pass filter. It so happens I own a MiniDSP 2x4HD which I think can do the job. The only limitation is that I need to then use the internal Dac of the of the MiniDSP and it is not my preferred Dac. Are there alternative approaches that won't cost too much? My music server is a Mac mini running Roon. Roon can do DSP but as far as I know I can only treat one signal stream at a time and there is no way to split the original signal in two and get two outputs from the computer. Any ideas would be appreciated.

Is there possibly a way to split the output from a Dac and then apply the high and low bandpass filters using some combinations of resistors and capacitors as done in a speaker crossover?

@bruce19  You could install a coupling capacitor between the source (perhaps a preamp) and the SET, with a value calculated to have a -3dB point at the desired crossover frequency.

Frequency in Hz = 1,000,000/Capacitance in uF times Resistance on Ohm time 2Pi  (Usually when this formula is used the one million is a 1, but the capacitance is in Farads, which is too large to be easy to use. So I do the formula this way so I get practical audio values)

So if you wanted 60Hz as the crossover frequency and the input impedance of your amp is 100KOhms, then the capacitor would be about 0.027uf (that yields a 59Hz -3dB point).

This cap can be tiny since it does not need to handle much Voltage. So you might be able to install it inside an RCA connector of the interconnect cable.

@bruce19 

If you already own the 2x4, there's no harm experimenting with an active crossover setup like you described, which sounds like it would work fine. If you're pleased with the proof of concept, then you can consider the DAC question. Just my 2¢! 🙂

That is great, thank you! I needed that specificity of detail in your example to get it. I'm looking forward to giving this a try. Probably as good a jump in performance as a $1,000 cable :-)

@atmasphere 

PS to the previous reply. Does the type pf cap matter? Film or ceramic? I don't think electrolytics come in that small a rating.