Yamaha T-700 User Manual download pdf (Page 1)

Australian Hi-Fi

equipmenT

review

Newport Test Labs

Power Output: Both channels driven into

8-ohm and 4-ohm non-inductive loads at

20Hz, 1kHz and 20kHz using High-Z

speaker output setting. [Yamaha AS700]

Yamaha A-S700

Integrated Ampliﬁ er

Yamaha is now one of the only large multi-

national manufacturers that continues to offer

an extensive range of high-quality two-chan-

nel ampliﬁ ers and if the incredible success of

its ﬂ agship stereo ampliﬁ ers, the AS-2000 and

AS-1000 are any indication, the other compa-

nies are already ruing the day they decided to

exit the two-channel market. The good news

for everyone else is that Yamaha is now offer-

ing even more of the same, in the shape of the

A-S700, at less than half the cost of the award-

winning AS-1000 (it picked up a ‘Best Product

Award 2008–9’ from the European Imaging

and Sound Association).

The Equipment

Visually, the A-S700 is almost a clone of the

ﬂ agship model A-S2000, with what appears

to be an identical front-panel layout. How-

ever, when you investigate more closely, you

will see that although the control locations

are identical, different front panel controls

are ﬁ tted to those locations. If you look at

the photograph above, the two switches be-

low the input selector are for ‘CD Direct’ and

‘Pure Direct’, whereas on the A-S2000 these

front panel positions are used for phono stage

switching (MC/MM) and audio muting. And

whereas on the A-S700 the small rotary con-

trols to the right of the headphone socket

are for speaker selection (Off, A, B, A+B) and

record output switching (Line 1/2/3, CD,

Phono, Tuner), the two on the A-S2000 are for

headphone volume and record output switch-

ing. Take your ruler to the ampliﬁ ers and

you’ll ﬁ nd that although the A-S700’s front

panel is the same width (435mm) and a little

higher (151mm), it’s not nearly as deep (the

A-S700 is only 382mm deep, compared to the

A-S2000’s depth of 465mm). And if you resort

to weighing the two ampliﬁ ers to differentiate

them, you’ll discover that the A-S700 is only

half the weight (10.9kg vs. 22.7kg).

Despite this difference in weight (which

would seem to indicate at least some econo-

mies in the A-S700’s power supply), Yamaha

rates the power output of the A-S700 at 90-

watts per channel (into 8Ω), which is exactly

the same output it speciﬁ es for the A-S2000.

To skip ahead of myself slightly, the reason

Yamaha has been able to pull this trick is

found on the rear panel, where a user-adjust-

able speaker impedance selector must be man-

ually switched between ‘Low’ (for speakers

with a nominal impedance rating lower than

6Ω) and ‘High’ (for speakers rated at 6Ω or

higher). This switch ad-

justs the circuitry inside

the ampliﬁ er for either

maximum current drive

or maximum voltage, so

it’s an ‘either/or’ propo-

sition, whereas the A-

S2000 doesn’t have a

switch, so you get both

maximum current and

maximum voltage, no

matter what the imped-

ance of the speakers you

connect.

Activate the ‘Pure

Direct’ switch on the A-

S700 and the signal at the

CD input goes through

the input selector switch

and the volume control

but bypasses the tone

controls, loudness con-

trol and balance control.

22-28 Yamaha HFMar10.indd 22 26/02/2010 11:02:47 AM

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Summary of Contents

Page 1 - Yamaha A-S700

22 | Australian Hi-FiequipmenT reviewNewport Test LabsPower Output: Both channels driven into 8-ohm and 4-ohm non-inductive loads at 20Hz, 1kHz and

Page 2

24 | Australian Hi-FiequipmenT review Yamaha A-S700 Integrated Ampliﬁ erfeel that is typical of motor-driven volume controls, however the bene

Page 3

24 | Australian Hi-FiequipmenT review Yamaha A-S700 Integrated Ampliﬁ erfeel that is typical of motor-driven volume controls, however the bene

Page 4 - Laboratory Test Results

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Yamaha T-700 User Manual Page 1

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