CR670 - Audio Amplifier YORKVILLE - Free user manual and instructions

USER MANUAL CR670 YORKVILLE

IMPORTANT SAFETY INSTRUCTIONS

CAUTION AVIS

RISK OF ELECTRIC SHOCK DO NOT OPEN ISQUE DE CHOC ELECTRIQUE NE PAS OUVIR

INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS.

CAUTION:

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

INSTRUCTIONS RELATIVES AU RISQUE DE FEU, CHOC ÉLECTRIQUE, OU BLESSURES AUX PERSONNES.

AVIS:

AFIN DE REDUIRE LES RISQUE DE CHOC ELECTRIQUE, N'ENLEVEZ PAS LE COUVERT (OU LE PANNEAU ARRIERE). NE CONTIENT AUCUNE PIECE REPARABLE PAR L'UTILISATEUR.

CONSULTEZ UN TECHNICIEN QUALIFIE POUR L'ENTRETIENT.

Read Instructions:

The Owner's Manual should be read and understood before operation of your unit. Please, save these instructions for future reference.

Packaging:

Keep the box and packaging materials, in case the unit needs to be returned for service.

Warning:

When using electric products, basic precautions should always be followed, including the following:

Power Sources:

Your unit should be connected to a power source only of the voltage specified in the owners manual or as marked on the unit. This unit has a polarized plug. Do not use with an extension cord or receptacle unless the plug can be fully inserted. Precautions should be taken so that the grounding scheme on the unit is not defeated.

Hazards:

Do not place this product on an unstable cart, stand, tripod, bracket or table. The product may fall, causing serious personal injury and serious damage to the product. Use only with cart, stand, tripod, bracket, or table recommended by the manufacturer or sold with the product. Follow the manufacturer's instructions when installing the product and use mounting accessories recommended by the manufacturer.

The apparatus should not be exposed to dripping or splashing water; no objects filled with liquids should be placed on the apparatus.

Terminals marked with the "lightning bolt" are hazardous live; the external wiring connected to these terminals require installation by an instructed person or the use of ready made leads or cords.

No naked flame sources, such as lighted candles, should be placed on the apparatus.

Power Cord:

The AC supply cord should be routed so that it is unlikely that it will be damaged. If the AC supply cord is damaged DO NOT OPERATE THE UNIT.

Service:

The unit should be serviced only by qualified service personnel.

Your new CR670 power amplifier is designed and built to provide years of trouble free performance. The CR670 is capable of powering large distributive loudspeaker systems as well as sound reinforcement loudspeakers (plenty of headroom under the hood). Like all Yorkville Sound amplifiers, it is designed to be rugged and reliable in all applications. The limiter has two modes of operation, which maintains the clarity of midrange signals, but can also provide thumping bass notes. Generous output current capability along with low distortion and high headroom performance guarantee the sonic integrity of the CR670 power amplifier.

Since the CR670 has been designed and manufactured by Yorkville Sound, each unit undergoes rigorous Quality Assurance tests. Each circuit is tested by sophisticated computer controlled equipment (which is capable of identifying any deviation from the design center parameters). The final tests include a temperature cycled burn-in period.

INPUTS

Figure 1

Figure 2

The two input channels have independent gain controls that sum into one signal, which is amplified by the power amplifier section.

Unbalanced Inputs

The Combi-jack and terminal strip can be used to connect an unbalanced signal to the CR670. Follow the directions in figure 3 through 5 for the various unbalanced connections. If possible, always use balanced cables, as they will reduce the possibility of noise entering the sound system. If unbalanced cables must be used, keep the length of the cable as short as possible to minimize the amount of noise picked up by the cable.

Balanced Inputs

The CR670 has high quality balanced inputs with hum rejection. Three types of balanced input connectors are available. The Combi-jack input will accept a standard 1/4-inch TRS (stereo) phone plug or an XLR plug for balanced operation. The tip of the 1/4-inch TRS (stereo) phone plug and pin 2 of the XLR plug are the positive (hot) connections. A terminal strip input allows for a direct-wired connection for installation applications. Use a forked lug for a #6 screw to connect the input wires to the barrier strip. Follow the directions in figures 1 & 2 (on the sidebar) for the various balanced connections. We recommend using balanced connections wherever possible to ensure that the system is noise free.

Mono Operation

The CR670 is a mono amplifier. The loudspeaker load is connected across the red and white binding posts with the positive lead of the loudspeaker wire connected to the red channel binding post.

Optiona* M2 Input Microphone Mixer Module

Adding the optional M2 Input Microphone Mixer Module can increase the versatility of a CR670. The M2 module is a two-channel microphone mixer complete with bass and treble controls. The module provides independent gain control of the two microphone inputs, allows bass and treble control of the music signal, then mixes its signal with the summed signal from input channels A and B before entering the limiter circuit.

Figure 3

Figure 4

Figure 5

Figure 6

*The M2 module can be ordered through any Yorkville dealer. A certified service technician MUST install the M2 module.

Outputs

Two types of output connectors are on the output of the CR670. Heavy duty binding posts accept a banana plug, or bare wire connection. A terminal strip output allows for a direct-wired connection for installation applications. Use a forked lug for a #6 screw to connect the loudspeaker wires to the barrier strip.

The CR670 delivers up to 600 watts into an 8 ohm loudspeaker. Don't put anything less than an 8 ohm loudspeaker load across the speaker terminals or the amplifier may go into protection. Please read the section on Designing and Installing 70 volt Audio Systems in your manual.

Gain Controls

The CR670's gain controls are located on the back of the amplifier. This prevents tampering with the gain controls when the amplifier is rack mounted. The gain controls are calibrated in dB (decibels), corresponding to the audio voltage present at the speaker output jacks. Where many amplifiers are used in an installation, the gain controls scaled in dB allow the user to precisely set the audio output level of one CR670 amplifier relative to the other CR670 amplifier. This only works if the amplifiers are receiving the same amplitude of input audio signal. The 0db or "full" position of the gain control refers to 70 volts RMS (which equals 600 watts into 8 ohms) on the output of the amplifier when a 1.4 volt

RMS voltage is present at the input jacks. Placing the gain control in the -3dB position with 1.4 volt RMS voltage present at the input jacks will result in a 49 volt signal (which equals 300 watts into 8 ohms) at the speaker output.

Limiter

The limiter switch located on the back panel of the amplifier changes the mode of the limiter. When the limiter

switch is in the "peak" position, the limiter acts as a peak limiter with a short decay time. This allows the bass thumps in music to drive the output of the amplifier into clipping for the duration of the thump, but will not heavily clip a continuous signal like someone screaming into a microphone. When the limiter switch is in the "average" position the release time of the limiter is extended and the limiter acts more like a leveler. This mode is useful for public address applications where the full headroom of the amplifier is utilized and the quality of the voice is maintained by using the soft clipping feature of the limiter.

Short Circuit Protection

The CR670 is fully protected against all possible passive loudspeaker load conditions. It can operate with a "dead" short continuously without damage (however, we don't recommend that you short your CR670 "just for fun"). Shorts create a lot of stress on the output devices. If a short is present on the output of the amplifier with a signal passing through the amplifier then the protect LED will illuminate continuously and the amplifier will go into "sleep mode" turning off the audio signal passing through the amplifier. After 8 seconds, the amplifier will allow the signal to pass through the amplifier and check to see if the short has been removed. If the short is still present the amplifier will go through the sleep mode cycle again. If the short has been removed, the amplifier will continue to drive the speaker.

Cooling & Thermal Protection

Passive cooling (this means that there isn't any fan in the amplifier) was chosen for this design to provide years of maintenance free operation. In dusty locations dirt may settle on the heatsinks. If the amplifier is permanently installed in a dusty location the heatsinks must be cleaned on a regular schedule.

When operating the CR670, care should be taken to allow adequate cooling around the heatsink fins along the sides of the chassis and not to block the ventilation holes in the top and bottom covers of the chassis. The CR670 was designed to run cool under normal operating conditions, but restricting the airflow around or through the amplifier could cause the amplifier to thermally shutdown.

If the temperature on the heatsinks of the CR670 exceeds the safe operation temperature, then the amplifier will shutdown illuminating both protection LED's and turn off the audio signal to the speaker output jacks until the heatsink temperature drops to a safe level.

Rack Mounting

The CR670 was designed to mount into a standard 19-inch rack. Care must be taken to provide adequate ventilation around the amplifier. Here are some tips to ensure that the CR670 will have adequate cooling when mounted into a rack:

• Leave a blank rack space above and below the amplifier when stacking equipment into the rack.

• If several CR670s are stacked in a rack, in addition to the tip above, provide fan forced cooling from the bottom of the rack up through the amplifier stack.

The rack itself should have adequate ventilation to the outside air. Leave the front and back of the rack as open as possible. If fans are used, draw the air in through the bottom front of the rack; drive the air up through the amplifiers, allowing the air to vent out through the top back section of the rack.

Clip / Protection LED's

The clip/protection LEDs on the front panel will blink to visibly indicate any signal excursion beyond the dynamic headroom of the amplifier. The clip/protection LEDs will remain on when the amplifier goes into its protection mode. The CR670 will go into protection for one of three reasons:

• The power switch of the amplifier has just been turned on or off.
• The amplifier has a shorted speaker load on the output of the amplifier.
• The temperature on the heatsinks of the CR670 exceeds the safe operation temperature.

Design And Installation of 70 Volt Audio Systems

1. When do you need a 70V system?

70 volt systems are needed when there are either a large number of loudspeaker locations or the distance between the source amplifier and the loudspeakers is greater than 100 feet (30 meters).

2. What do I need?

First, you need an amplifier that is capable of supplying 70 volts. The CR670 will do just fine. Then, for the loudspeakers, you'll need loudspeakers with built in 70 volt step-down matching transformers, or add 70 volt step-down transformers to low impedance (4 or 8 ohm) loudspeakers. (Loudspeakers like the Yorkville C110 and C120/70 have built-in matching transformers.)

3. Putting it all together

a) Amplifier Power. 70V systems require a certain amount of power to distribute the signal properly. The total number of loudspeakers you can connect correlates directly to the power output (watts) of your amplifier (and the loudspeaker's 'power tap' that you have chosen on your loudspeaker's matching transformer). For example, if you're using a CR670, which is a 600 watt power amplifier, you can connect up to a maximum of 98 loudspeakers (with transformers) by using the 5 watt power taps on their matching transformers. (600W divided by 5W = 120 , less 20% as a safety margin = 98 .) Now that's a lot of loudspeakers!
NOTE: it's recommended to allow approximately 15-20% as a safety margin for headroom accounting for the losses in the transformers when calculating how many loudspeakers
b) Calculating Amplifier Power. The power demand of the system will depend on the total of your loudspeaker's transformer power tap selections. once you've set the power taps for each loudspeaker/transformer, just add it up. If you have to guess, guess on the high side then add about 20% . For general (quiet room) applications, about 10 watts per loudspeaker is more than adequate.
c) Power Taps. 70 volt loudspeaker transformers usually have several 'power taps' (wires or solder tabs) so you can set the comparative loudness of each loudspeaker during installation. As an example, the Yorkville C110 and C120/70 loudspeakers have a rotary switch with 3 power settings as well as a straight-through setting (which bypasses the built-in transformer for conventional usage and presents an 8 ohm load to the amplifier). Do not operate your CR670 with several loudspeaker in parallel when the loudspeaker's switch is set to the "straight through" setting.
d) Connecting the loudspeaker transformers to the loudspeakers. If your chosen loudspeaker does not contain a 70 volt step-down transformer, then you will have to connect a transformer in series to the input terminals of the loudspeaker. The loudspeaker matching transformer should have various power tap leads (or terminals) plus one marked COM on the 'system' side (the side that connects to the amplifier). The other side of the transformer (for connection to the loudspeaker) will usually have two or three leads (or terminals), one probably marked 4 ohms, one 8 ohms and the other marked COM (or C). That is the side that you attach to the loudspeaker. Using a short length of loudspeaker cable, attach the transformer's COM lead or terminal to the negative loudspeaker terminal. Then attach the other lead (marked 8 ohms) to the positive loudspeaker terminal.
e) Connecting the loudspeaker transformers to the system leads. The loudspeaker's matching transformer's COM (or C) lead should connect directly to the 'systems' COM wire. Connect the chosen transformer power tap lead to the 70 volt system live wire. Each loudspeaker connects to the 70 volt system wire in parallel. See the Diagram on last page.
f) What if the loudspeakers have built-in transformers? Just connect the 70 volt system COM wire to the negative loudspeaker terminal and the 70 volt system live wire to the positive loudspeaker terminal.

INTRODUCTION

Continuous Power: (1 KHz, 0.1% THD)

8 ohms 600 Watts 70VRMS

Burst Power: (10m Sec of 1KHz, 1% THD)

8 ohms 960 Watts

Frequency Response: ±1 dB 50Hz - 20 KHz

Hum and Noise: < -104 dB (unweighted)

Distortion: <0.015% THD (typ, 1 KHz 8 o

<0.15% THD (typ, 50 Hz - 20KHz, 8 ohms)

Slew Rate: >40 V/uSec

Damping Factor: >300

Input Impedance: 20 K ohms Balanced

10 Kohms Unbalanced

Input Sensitivity: 1.4 (34dB gain) VRMS Sine

Common Mode Rejection (CMRR): 54 dB minimum / 66 dB typical (at 60 Hz)

Modes: Mono

Power Consumption: 450 Watts (typ), 810 W (max)

Protection: DC, Load, and Thermal

Limiter: Selectable Peak or Average

Cooling: Passive Convection

Input Connectors: Terminal Strip and XLR / 1/4-inch Phone (TRS) Combi-Jack

Transformer: Toroidal

Rack Space: 3 Spaces

Size: 28 cm x 48 cm x 13 cm (DWH)

11 in x 19 in x 5.25 in (DWH)

Exterior Finish: Baked, Black Painted Aluminum

Weight: 23 lbs. 10.5 Kg

Specifications

Puissance Continue: (1 KHz, 0.1% THD)

8 ohms 600 Watts 70VRMS

Puissance d'éclatement: (10m Sec of 1KHz, 1% THD)

8 ohms 960 Watts

Distortion: <0.015% TH

Vitesse de propagation: >40 V/uSec

Niagara Falls, New York

14305 USA

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