Crown PIP-AMC Technické informace stáhnout pdf (Strana 31)

Macro-Tech 3600VZ Power Amplifier

Page 31

Crown specifications are guaranteed for three years.

In an effort to provide you with as much information as possible about the high power-producing capabilities of your amplifier, we have

created the following power matrices.

Minimum Guaranteed Power Specifications

Crown’s minimum power specifications represent the absolute smallest amount of output power you can expect from your amplifier

when it is driven to full output under the given conditions. Some spaces in each matrix may be left blank because the same guarantee

is not provided for those conditions—however, your amplifier will perform well under all conditions listed in each matrix.

When measuring power, 0.1% THD appears to be the industry standard for distortion. Two of the maximum average power

specifications shown in each minimum power matrix are measured at 0.1% THD so you can easily compare Crown specifications to

those of other manufacturers. But this high level of distortion actually allows for some clipping which is undesirable. Because of this, a

maximum average power specification at 0.05% THD is included in each minimum power matrix which represents non-clipped

conditions. Although most manufacturers do not give you power specifications at 0.05% THD, we encourage them to provide these

specifications so you will have a more realistic representation of the way amplifiers should be used in the real world—without a clipped

output signal.

Many manufacturers publish power specs with a tolerance of ±1 dB or worse. This means their amplifier can deviate more than 20%

in output! A 100 watt amplifier would meet their specification if it only produced 79.4 watts. Other manufacturers qualify their specs by

saying they are “typical,” “subject to manufacturing tolerances,” “single channel driven” or that they are specified with “fuses

Macro-Tech 3600VZ –

Minimum Power (Watts)

Stereo/Mono

Mode

Stereo

(both channels

driven)

Bridge-Mono

(balanced output)

Parallel-Mono

FTC Continuous Average

0.1% THD + Noise

(See note 4)

1 kHz 20Hz-20kHz

Maximum Average

Load (Ohms)

AC Mains120 VAC, 60 Hz Units

1 kHz

0.1% THD+N

(See note 1)

0.1% THD+N

(See note 2)

20Hz-20kHz

Stereo

(both channels

driven)

Bridge-Mono

(balanced output)

Parallel-Mono

0.05% THD+N

(See note 3)

1 kHz

100 VAC Transformer

Stereo

(both channels

driven)

Bridge-Mono

(balanced output)

Parallel-Mono

230 VAC Transformer

885

<680

850

<680

275

1060

2115

2140

895

1780

1785

870

1735

1750

1800

1565

1120

3505

3140

2210

3555

3190

2235

1460

1300

980

2835

2625

1950

2820

2585

1940

1520

1325

965

2800

2515

1900

2910

2565

1935

1035

940

955

1765

1785

1555

1110

3490

3110

2190

3530

3155

2225

1360

1290

970

2825

2600

1940

2810

2550

1925

1495

1300

930

2740

2445

1855

2840

2520

1915

Figure 6.1 Minimum Power Matrix

bypassed.” Each of these statements effectively

removes any performance guarantee. In fact, some

manufacturers use these tactics to generate large

power numbers, and they don’t even print a disclaimer.

We take a different approach at Crown—our amplifiers

are

guaranteed

to meet or exceed their specifications

for three years. Further, because our published specs

are set below our “in-house” measurements, you can

expect

every

Crown amplifier to

exceed

its published

minimum power specs. We believe you should get what

you pay for.

Minimum Power Notes:

All minimum power specifications are based on 0.5%

regulated AC mains with THD of less than 1.0% and an

ambient room temperature of 70° F (21° C). Standard

EIA power (RS-490) is not shown here because it is iden-

tical to FTC Continuous Average Power.

1. A 1 kHz sine wave is presented to the amplifier and

the output monitored for nonlinear distortion. The level

is increased until THD reaches 0.1%. At this point,

average power per channel is reported.

2. A sine wave is presented to the amplifier over the

range from 20 Hz to 20 kHz and the output monitored

for nonlinear distortion. The level at each frequency

is increased until THD reaches 0.1%. At this point,

average power per channel is reported.

3. A 1 kHz sine wave is presented to the amplifier and

the output monitored for nonlinear distortion. The level

is increased until THD reaches 0.05%. At this point,

average power per channel is reported.

4. Continuous power in the context of Federal Trade

Commission testing is understood to be a minimum

of five minutes of operation. Harmonic distortion is

measured as the RMS sum total and given as a per-

centage of the fundamental output voltage. This ap-

plies for all wattages greater than 0.25 watts.

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