Marantz 2325 2275 2250 B Brochure

Page 2

things to look for
when buying a

stereo recelver.

But first look at the nameplate. If it says Marantz 2325, 2275 or 22508,
you can be sure youre getting all twelve points described below.
These design concepts often make the difference between acceptable
performance and exceptional performance.

POWER AMPLIFIER SECTION

1. Full Complementary
Symmetry Output

Assures higher stability, better linearity and lower distortion than the
quasi-complementary outputs used in the amplifier sections of most
receivers.

Quasi-complementary circuitry tends to generage high order harmonic
distortion and is particularly susceptible to crossover distortion. To reduce
these types of distortion. manufacturers increase the amount of feedback
within the amplifier. Under actual dynamic conditions. however, the
amplifier with excessive feedback is prone to higher transient distortion
and also lower stability.

In contrast, full complementary symmetry output circuitry requires less
feedback by incorporating positive and negative amplifiers which are
balanced to mirror-image each others characteristics. This design produces
exceptional linearity, lower total harmonic distortion and lower inter-
moduiation distortion.

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"Full complementary symmetry output assures higher
stability, better linearity and lower distortion than
the quasi-complementary outputs in most receivers"

For these excellent reasons. Marantz receivers feature full complementary
symmetry designas used extensively in Marantz Professional Products.

2. Direct Coupled Power Output

Provides wide power bandwidth. excellent low frequency transient
response and improved damping factors.

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The direct coupled power output circuitry used in
Marantz receivers has eliminated the need for
coupling transformers and capacitors and the sound
inaccuracies they can cause?

Early transistorized power amplifiers featured one of two types of output
design: A transformer or a capacitor was incorporated between the power
output stage and the speaker system. However necessary this was for
proper output-to-speaker coupling, it tended to limit low frequency power
response or to cause degrading phase shift, and thus impair sound
accuracy.

Today's more advanced technology has eliminated the need for coupling
transformers and capacitors and the sound inaccuracies they can cause.

The sophisticated direct coupled output stages used in Marantz amplifiers
assure you of extremely high damping factors at low frequencies and
the best possible low frequency response.

3. Heavy-Duty Power Supply

High reserve power supply sections and power output circuitry ensure that
Marantz receivers will continue to meet specifications through years of
steady performance.

A massive power transformer forms the heart of a dual-balanced positive
and negative power supply that symmetrically powers the amplifier stages.
Large capacity electrolytic capacitors assure high energy power reserves,
while massive heat sinks promote highly reliable. long-term operation
even under full power output Conditions.