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Australian

LAB REPORT

Marantz PM-11S3 Integrated Ampliﬁer

CONTINUED FROM PAGE 48

harmonic distortion component is the

second harmonic (HDL²), which is ‘good-

sounding’ because it’s the musical octave of

the fundamental. (So instead of one ‘D’ being

played, for example, it’s as if you played

both the ‘D’ and the ‘D’ the octave above.)

However, even though the second harmonic

is the only signiﬁcant distortion component,

it’s still 95dB (0.0017%) down at 1-watt when

driving either 8Ω or 4Ω loads, and 85dB

(0.0056%) down at 100-watts when driving

those same two loads. As for those higher-

order harmonic distortion components you

can see on these graphs (the small ‘spikes’

rising above the noise ﬂoor), these are mostly

at or below either –110dB (0.0003%) or

–120dB (0.0001%).

Since I have mentioned the noise ﬂoor,

let’s look at it in Graphs 1 and 3. You can

see that it’s most sitting down around 130dB

down referred to 1-watt, and nearly –140dB

referred to rated output. Also note that at

the extreme left of each graph, a signal

(probably at 50Hz) is more than 100dB

down in both cases, which is excellent. As

for the wide-band noise ﬁgures, Newport Test

Labs measured them at 85dB unweighted

referred to one-watt output (increasing to

91dB with weighting) and 91dB unweighted

referred to 100-watts, increasing to 97dB

with A-weighting. These are vanishingly low

levels of noise, probably helped by Marantz

using choke-input ﬁlters, which are more

effective at ﬁltering out the RF noise that is

now present on all mains power lines. (And

the way chokes operate which means they’re

continually storing energy in their magnetic

ﬁelds that is slowly released to the capacitors,

0.00 Hz 6000.00 12000.00 18000.00 24000.00 30000.00

-140.00

-120.00

-100.00

-80.00

-60.00

-40.00

-20.00

0.00

dBFS

Graph 5: Intermodulation distortion (CCIF-IMD) using test signals at 19kHz and 20kHz, at

an output of 1-watt into an 8-ohm non-inductive load, ref. to 0dB. [Marantz PM-11S3]

Newport Test Labs

0.00 Hz 4000.00 8000.00 12000.00 16000.00 20000.00

-140.00

-120.00

-100.00

-80.00

-60.00

-40.00

-20.00

0.00

dBFS

Graph 2: Total harmonic distortion (THD) at 1kHz at an output of 1-watt into a 4-ohm

non-inductive load, referenced to 0dB. [Marantz PM-11S3 Integrated Amplifier]

Newport Test Labs

10.00 Hz 100.00 1000.00 10000.00

-1.00

-0.75

-0.50

-0.25

0.00

0.25

0.50

0.75

1.00

dBr

Graph 6: Frequency response of line input at an output of 1-watt into an 8-ohm non-

inductive load (black trace) and into a combination resistive/inductive/capacitive load

representative of a typical two-way loudspeaker system (red trace). [Marantz PM-11S3]

Newport Test Labs

10.00 Hz 100.00 1000.00 10000.00

-8.00

-6.00

-4.00

-2.00

0.00

2.00

4.00

6.00

8.00

dBr

Graph 7: Tone control action referenced to 0dB at 1kHz. Red trace shows increase in level

when switching tone controls out of circuit. [Marantz PM-11S3 Integrated Amplifier]

Newport Test Labs

0.00 Hz 4000.00 8000.00 12000.00 16000.00 20000.00

-140.00

-120.00

-100.00

-80.00

-60.00

-40.00

-20.00

0.00

dBFS

Graph 4: Total harmonic distortion (THD) at 1kHz at rated output (200-watts) into a 4-ohm

non-inductive load, referenced to 0dB. [Marantz PM-11S3 Integrated Amplifier]

Newport Test Labs

0.00 Hz 4000.00 8000.00 12000.00 16000.00 20000.00

-140.00

-120.00

-100.00

-80.00

-60.00

-40.00

-20.00

0.00

dBFS

Graph 3: Total harmonic distortion (THD) at 1kHz at rated output (100-watts) into an

8-ohm non-inductive load, referenced to 0dB. [Marantz PM-11S3 Integrated Amplifier]

Newport Test Labs

0.00 Hz 4000.00 8000.00 12000.00 16000.00 20000.00

-140.00

-120.00

-100.00

-80.00

-60.00

-40.00

-20.00

0.00

dBFS

Graph 1: Total harmonic distortion (THD) at 1kHz at an output of 1-watt into an 8-ohm

non-inductive load, referenced to 0dB. [Marantz PM-11S3 Integrated Amplifier]

Newport Test Labs

so that there is a continuous charging

current, probably helped kick the power

output ﬁgures along.)

Tone control action was quite unusual,

more like a two-band parametric equaliser,

with centre frequencies at 45Hz and 30kHz,

that offers boost and cut of around 8.5dB. As

you can see (Graph 7) there’s no shelving at

all, but there doesn’t really need to be, since

the controls’ effect at very low and very high

frequencies is self-limiting, so you can’t get

either excessive bass boost or excessive treble

boost. Overall, I’d suspect that in operation,

the effect of the bass and treble controls on

the music will be far more subtle than if a

Baxandall contour were used. So if you’re

normally hesitant about using bass and treble

controls, try the ones ﬁtted to the PM-11S3—

you might be in for a pleasant surprise.

On Graph 7 you can see not only the

‘reference’ frequency response with the tone

controls ‘in circuit’ (the black trace) but also the

frequency response when the tone controls are

switched out of circuit (the red trace).

You can see there’s an overall 1.6dB increase in

volume when you switch the tone controls out

of circuit, which is sufﬁcient that the sound of

the ampliﬁer will appear to ‘improve’ when the

tone controls are switched out, and vice versa

when they’re switched in, even if the bass and

treble tone controls are set to 0dB. In reality,

there’s no actual ‘improvement’ as such, it’s just

a trick of human hearing, which always prefers

the louder of two otherwise identical sounds.

The Marantz PM-11S3 has a low output

impedance (measured by Newport Test Labs

as being 0.04Ω at 1kHz), which means a high

damping factor (200), which in turn means

that this ampliﬁer will be able to keep a ﬁrm

grip on even the most compliant bass driver,

and its frequency response will not vary with

variations in a loudspeaker’s impedance.

Square wave testing showed the ampliﬁer’s

response does not extend to d.c. and that

there’s very little phase shift at low frequencies.

The 1kHz square wave is almost perfect, an

excellent result, as is the 10kHz square wave,

which shows a very fast rise-time and only

minor rounding on the leading edge. Loaded

down with a highly capacitive load (2µF

paralleled with 8Ω) there is a small amount

of ringing, but it’s quickly damped and

always entirely under control, proving that

this ampliﬁer will be stable even into highly

reactive loads… such as electrostatic speakers.

Judging by the results measured by Newport

Test Labs during its testing procedures, it’s

my opinion that this is a very well-designed

ampliﬁer, and one where the design has

also been well-executed in production. My

congratulations to both teams.

Steve Holding

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