Crown Micro-Tech MT-1000 Informations techniques télécharger pdf (Page 27)

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Micro-Tech 600/1200/2400 Power Amplifiers

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 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+noise so you can easily compare Crown specifications to those of other manufactur-

ers. But this high level of distortion actually allows for some clipping which is undesirable. Because of this, a maximum average power specifica-

tion at 0.05% THD+noise 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 represen-

tation 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 specifications by saying they

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

tions for three years. Further, because our published specs are set below our “in-house” measurements, you can expect

every

Crown amplifier

exceed

its published minimum power specs. We believe you should get what you pay for.

Micro-Tech 600 –

Minimum Guaranteed 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

285

210

570

420

320

220

645

450

635

450

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)

400

325

225

750

655

450

700

665

450

20Hz-20kHz

335

300

210

650

605

425

Stereo

(both channels

driven)

Bridge-Mono

(balanced output)

Parallel-Mono

285

215

565

430

320

230

645

465

645

455

380

335

230

730

680

465

680

665

460

305

220

625

440

0.05% THD+N

(See note 3)

1 kHz

395

325

220

745

650

445

695

660

450

375

330

230

725

670

465

675

665

455

International Units

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). Inter-

national units with multi-tap transformers are speci-

fied for the worst-case transformer tap (normally 100

VAC, 50 Hz). The standard EIA power measurement

(RS-490) is not identified here because it is identical

to the FTC Continuous Average Power specification.

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

and the output monitored for nonlinear distortion.

The level is increased until THD+noise reaches

0.1%. At this level the average power per chan-

nel 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+noise

reaches 0.1%. At this level the 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+noise reaches

0.05%. At this level the average power per chan-

nel is reported.

4. Continuous power in the context of Federal Trade

Commission testing is understood to be a mini-

mum of five minutes of operation. Harmonic dis-

tortion is measured as the RMS sum total and

given as a percentage of the fundamental out-

put voltage. This applies for all wattages greater

than 0.25 watts.

Fig. 6.1 Micro-Tech 600 Minimum Power Matrix

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 38 39

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