2. amps-preamps
  3. 1379016115

impedance matching and interconnect capacitance

I am considering moving my rack from between my speakers. The move would require me to have 25ft long interconnects single ended between my pre and my mono block power amps.

According to the specs of my amps, the impedance matching should not be an issue 260ohm output from my ARC SP-16, into a 100K ohm load at the input of the Quicksilver Mono blocks.

The manual for the SP-16 states that a maximum output capacitance is 1000pf.

I plan on using Mogami 2549 as the interconnect with a total capacitance of 87pf/m or 661pf total for 25 ft [7.6m] (not including connectors). This would leave me 340pf shy of the limit. Is this enough or are there other sources of capacitance to consider?
nick_sr

Showing 1 response by georgehifi

georgehifi's avatar
georgehifi
10,312 posts
 
With the output impedance of your ARC SP-16 at 260ohm and your capacitance of the cable at 661pf will make a HF filter at -3db at 926khz, no problem at all.
And the spec for 1000pf max load capacitance of your ARC is the max it can take for it may start to ring on "square wave test" as with 1000pf the -3db is at 612khz, still not effecting the audio band at all.
So it will just come down to if there is any noise with this length of single ended interconnect, or the colourations it may give.

Cheers George
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