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Old 9th May 2008, 04:43 PM   #11
gareth is offline gareth  Wales
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Originally posted by Conrad Hoffman
In a nutshell, if you build something with much wider bandwidth than you need, it will have near zero phase shift in the area you care about. This assumes no crazy all-pass networks in the circuit, but that's probably a safe assumption. Build a power amp that's -3 dB at 3 Hz and -3 dB at 100 kHz, and the phase shift between 20 and 20000 will be very small. Reasonable phase shift isn't generally considered audible, but IMO it's still a desirable thing to keep it to a minimum.
Hi Conrad,

Thanks for that. I will be using SACD as one of my sources and was hoping to have a wide bandwidth design to maximise the frequency range of the player. So I suppose all topologies could achieve this? (if designed properly).

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Old 9th May 2008, 04:45 PM   #12
gareth is offline gareth  Wales
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Originally posted by GRollins
I'm still not clear how you came to believe that this is a major problem in audio gear. Depending on how you want to look at things, your average dynamic loudspeaker (the kind with a voice coil and magnet) is regarded as a current-driven transducer; the idea that voltage is involved is just an inconvenient side effect. In fact, you can make an excellent argument for using current source amplifiers (as opposed to voltage source amps) to run midranges and tweeters. There's an even stronger case to be made for using them for woofers, except for the annoying fact that woofers need a low impedance source driving them to keep the cone from running away. That, in turn, can be overcome by using a current source amplifier, then using a servo system to hold the cone back...but that's getting rather farther down the road than you'll be wanting to go at the moment.
Trust me, this is tantamount to fretting over the color of paint on a race car when discussing how fast it will go.

But surely red cars are faster!!
I like the sound of what you describe but yeah I think that is a bit too far down the road for me at the moment. Thanks.

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