notes@isucs1.UUCP (10/26/85)
Since I just purchased a NAD 2200 PowerTracker, I thought I would make a few comments on the way it works, at least in comparison to the larger Carvers...
The following is from the NAD literature.
The NAD 220 is a "commutating " power amp, ie it has two power supplies,
switching to the high-voltage supply when maximum power is needed, and
sithcing to the lower-voltage supply for cooler operation at average power
levels. (190V and 125V) ...
(Rather than "borrowing" power like the Carver, the NAD...)
In the NAD 2200 the right channel is internally inverted in polarity.
When a bass waveform causes the left channel to draw current from the
positive supply, the right channel draws its bass power from the
negative supply, and vise-versa. This efficient usage halves the
instantaneous drain on either supply, allowing much stronger bass to be
reproduced without draining the supply. The right channel is re-inverted
at the speaker posts.
The NAD is rated at :
100 W (20dbW) Continuous Ave Power (8 ohms)
IHF dynamic headroom (8 ohms ) +6 dB
For further information, consult the review in Oct 85 Stereo Review,
or send mail. The NAD dealer in town is quite competent, and should
be able to answer most questions one may have.
p.s. The NAD lists for $448
The 400t lists for $449
The 500t lists for $559
Dave Jobusch at Iowa State University
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