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So we get new Yamaha desks? CL series
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<blockquote data-quote="Langston Holland" data-source="post: 50232" data-attributes="member: 171"><p>Re: So we get new Yamaha desks? CL series</p><p></p><p>Hi Mike:</p><p></p><p>That is an interesting point about the likely sonic change as you reduce the head amp gain from +18dB down to +17dB while the CL's relay steps the impedance down from 10kΩ to 3kΩ.</p><p></p><p>My thoughts are identical - sonics.</p><p></p><p>The highest input impedance I've seen to date in a console was the analog Crest at 4kΩ.</p><p></p><p>It is likely that the great majority of live sound types have never done a shootout speaking into various mics while varying mic preamp input Z as you have.</p><p></p><p>It's not subtle and EQ will not fix the losses of higher loading (lower Z's). The HF detail particularly from dynamic mics takes a hit when paralleling mic preamps with an analog split to a monitor console.</p><p></p><p>It is interesting that Yamaha chose to drop back down to 3kΩ with higher voltage output sources such as certain capacitor mics and line level sources. Sources with that kind of output have much lower output impedances, thus degrade far less under 3kΩ and lower input impedances. It's unlikely to be detectable sonically - but I'd love to find out their reasoning behind dropping back down to 3kΩ.</p><p></p><p>It requires better preamp design to properly deal with RF, voltage spikes and other non-audio garbage with higher input Z's. This is something more often found in high-end low channel count devices, not consoles.</p><p></p><p>IMO, the 10kΩ input Z with digital gain compensation at monitor world to avoid the parallel loading of an analog split is going to provide a happy surprise for a lot of people.</p><p></p><p>A very cool development.</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 50232, member: 171"] Re: So we get new Yamaha desks? CL series Hi Mike: That is an interesting point about the likely sonic change as you reduce the head amp gain from +18dB down to +17dB while the CL's relay steps the impedance down from 10kΩ to 3kΩ. My thoughts are identical - sonics. The highest input impedance I've seen to date in a console was the analog Crest at 4kΩ. It is likely that the great majority of live sound types have never done a shootout speaking into various mics while varying mic preamp input Z as you have. It's not subtle and EQ will not fix the losses of higher loading (lower Z's). The HF detail particularly from dynamic mics takes a hit when paralleling mic preamps with an analog split to a monitor console. It is interesting that Yamaha chose to drop back down to 3kΩ with higher voltage output sources such as certain capacitor mics and line level sources. Sources with that kind of output have much lower output impedances, thus degrade far less under 3kΩ and lower input impedances. It's unlikely to be detectable sonically - but I'd love to find out their reasoning behind dropping back down to 3kΩ. It requires better preamp design to properly deal with RF, voltage spikes and other non-audio garbage with higher input Z's. This is something more often found in high-end low channel count devices, not consoles. IMO, the 10kΩ input Z with digital gain compensation at monitor world to avoid the parallel loading of an analog split is going to provide a happy surprise for a lot of people. A very cool development. [/QUOTE]
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