Crown Audio 800CSL Test 14 Odep Limiting, Test 15 LF Protection, Test 16 Signal to Noise Ratio

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Power Base-2 & 800CSL Amplifier Service Manual

Checkout Procedures

Procedure Capacitive: Load each channel to 8 ohms in parallel with 2 µF. Inject a 20 kHz sine wave with 30 VAC output for 10 seconds.

Procedure Inductive: Load each channel to 8 ohms in parallel with 159 µHenries. Inject a 1 kHz sine wave with 15 VAC output for 10 seconds.

Procedure Torture: Load each channel with the primary (red and black leads) of a DC-300A transformer (D 5781-6). Inject a 10 Hz sine wave at sufficient output level to cause 3 to 5 flyback pulses, for 10 seconds. Procedure Short: Inject a 60 Hz sine wave at 5 VAC. After establishing signal, short the output for 10 sec- onds.

TEST 14: ODEP LIMITING

Spec: No oscillation on ODEP Limiting wave form; either channel controls limiting in Parallel Mono Mode. Initial Conditions: Controls per standard; rag or other obstruction blocking fan so that it does not turn.

Procedure: Load the amplifier to 4 ohms on each channel. Inject a 60 Hz sine wave and adjust for 35 Vrms at the output. After a few minutes observe a wave form similar to Figure 4. Remove the input signal from both channels and allow the amplifier to cool for a few minutes. Switch the amplifier to Parallel Mono and remove the load from Channel 1. Inject the signal into Channel 1 and observe that ODEP limiting occurs at the output of both channels. Remove the load from Channel 2, and install the load on Channel 1. Again, observe that both channels limit. Return all amplifier controls to standard initial conditions. Remove the fan obstruction.

TEST 15: LF PROTECTION

Spec: Amplifier mutes for low frequency.

Initial Conditions: Controls per standard.

Procedure: No load. Inject a 0.5 Hz 6 volt peak-to-peak square wave into each channel and verify that each channel cycles into mute.

TEST 16: SIGNAL TO NOISE RATIO

Spec: 100 dB (105 dB A-weighted) below rated 8 ohm power.

Initial Conditions: Controls per standard. Short inputs.

Procedure: Load each channel to 8 ohms. Measure less than 400 µV at the output of each channel (or –100 dB from reference of +36.25 dBu).

TEST 17: TURN ON TRANSIENTS

Spec: No dangerous transients.

Initial Conditions: Controls per standard.

Procedure: From an off condition, turn on the amplifier and monitor the output noise at the time of turn on. Note: Turn on noise may increase significantly if the amplifier is cycled off and on.

TEST 18: TURN OFF TRANSIENTS

Spec: No dangerous transients.

Initial Conditions: Controls per standard.

Procedure: From an on condition, turn off the amplifier and monitor the output noise at the time of turn off. Note: Turn off noise may increase significantly if the amplifier is cycled off and on.

TEST 19: INTERMODULATION DISTORTION

Spec at 0 dB Output: 0.01%.

Spec at –35 dB Output: 0.05%.

Initial Conditions: Controls per standard.

Procedure: Load each channel to 8 ohms. Inject a SMPTE standard IM signal (60 Hz and 7 kHz sine wave mixed at 4:1 ratio) at 320 Watts (41.0 VAC). With an IM analyzer measure less than 0.01% IMD. Repeat test at –35 dB (reference 320 Watts or 41.0 VAC) and mea- sure less than 0.05% IMD.

TEST 20: CLIPPING

Spec: No protective action during test.

Initial Conditions: Controls per standard.

Procedure: Load each channel to 8 ohms. Inject a 1 kHz sine wave at each input and drive output 6 dB into clip for 10 seconds. The amplifier should not activate any protective circuits (ODEP, Fault, or LF Protection).

Figure 4. ODEP Limiting Wave Form

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Contents Power BASE-2& 800CSL Avis Table of Contents Warranty IntroductionScope Parts Mechanical SpecificationsPower PerformanceBLU Voltage ConversionFront END Operation FeaturesTheory OverviewVoltage Translators Error AmpHigh Side HS Grounded Bridge TopologyLow Side LS Output Device Emulation Protection OdepPositive Standard Initial Conditions Checkout ProceduresTest 2 Output Bias Adjustment Test 3 Odep Voltage AdjustmentTest 12 Output Power Test 4 AC Power DrawTest 5 Common Mode Rejection Test 7 Phase ResponseTest 17 Turn on Transients Test 16 Signal to Noise RatioTest 14 Odep Limiting Test 15 LF ProtectionPost Testing Mechanical Non-Module Parts Output Assembly ONE PER Channel Back Panel AssemblyChassis Front Assembly Main Chassis Assembly Main Modules Module InformationModule History Output ModulesQ42647-0 Output Module Parts List P10137-1 Board Q42717-1 Output Module MT/MA #2 for PB-2 Q42717-1 Output Module Parts List P10233-8 BoardQ42871-6 Output Module MT/MA TO-3P Driver for PB-2/ 800CSL Q42871-6 Output Module Parts List P10305-4 BoardQ42966-4 Output Module TO-3P Driver #2 for PB-2/ 800CSL Q42966-4 Output Module Parts List P10305-4 BoardQ43015-9 Output Module Parts List P10341-9 Board Q43203-1 Output Module Parts List P10397-1 Board Q42665-2 Main Module Parts List D 6910-0 Board Network ResistorsQ42665-2 Main Module Original for PB-2 IC’S SwitchesQ42683-5 Main Module #2 for PB-2 Q42683-5 Main Module Parts List D 6910-0 BoardZero OHM InterconnectsQ42818-7 Main Module 3rd Gain for PB-2/800CSL Q42818-7 Main Module Parts List D 7251-8 BoardDpdt Side Header 5 PIN Q43059-7 Main Module Parts List D 7993-5 Board Jumper UPA75

800CSL specifications

Crown Audio has long been a respected name in professional audio equipment, and the 800CSL amplifiers are a testament to their unwavering commitment to quality and performance. Designed for professional sound reinforcement applications, the Crown 800CSL offers an impressive blend of power, reliability, and versatility, making it a popular choice among audio engineers and event coordinators.

At the heart of the Crown 800CSL is its robust power output. This amplifier delivers an impressive 800 watts per channel at 4 ohms, ensuring that it can drive even the most demanding speakers with ease. It features a Class D design, which not only maximizes efficiency, allowing for more power with less heat generation, but also contributes to a lightweight chassis that is easy to transport and install. This makes the 800CSL a versatile option for both permanent installations and mobile events.

One of the key technologies employed in the Crown 800CSL is its comprehensive built-in protection circuitry. This includes advanced short circuit protection, over-temperature protection, and current limiting. Such features ensure that the amplifier operates reliably in challenging conditions, reducing the risk of damage to both the amplifier and the connected speakers. The inclusion of a low-frequency filter further enhances performance, providing clean, powerful bass without distortion.

The Crown 800CSL also offers a range of connectivity options, including XLR and ΒΌ-inch inputs, making it compatible with a wide variety of audio sources. This flexibility, combined with user-friendly front panel controls, allows audio professionals to set up and adjust the system quickly and efficiently.

Additionally, the amplifier features a robust and compact design with a lightweight aluminum chassis. This not only contributes to its portability but also aids in heat dissipation, further enhancing performance during prolonged use. The included handles on the chassis make it easy to transport the unit between gigs, while its durable components ensure longevity.

In summary, the Crown Audio 800CSL stands out for its power, efficiency, and reliability. From its Class D amplification technology to its comprehensive protection features, this amplifier is designed to meet the needs of professionals in the audio industry. Whether for concerts, events, or installations, the 800CSL is poised to deliver exceptional sound quality and performance, making it a valuable addition to any audio toolkit.
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