SR300 - Speaker YORKVILLE - Free user manual and instructions

USER MANUAL SR300 YORKVILLE

IMPORTANT SAFETY INSTRUCTIONS

CAUTION AVIS

RISK OF ELECTRIC SHOCK DO NOT OPEN ISQUE DE CHOC ELECTRIQU NE PAS OUVRIN

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 SR300 power amplifier is designed and built to provide years of trouble free performance. Although specifically designed to power small studio monitors it has many other applications as well. Like all Yorkville Sound amplifiers, it is designed to be rugged and reliable in all applications. The limiter and high pass filter are optimized to increase the reliability of small studio monitors but can be used with higher power speakers as well. Generous current capability along with low distortion and high headroom guarantee the sonic integrity of the power amplifier.

The SR300 is designed and manufactured by Yorkville Sound. Each unit undergoes a temperature cycled burn-in period, and each circuit is tested by sophisticated computer controlled equipment which is capable of identifying any deviation from the design center parameters.

Balanced Inputs

The SR300 has a high quality balanced input with high hum rejection. The 1/4'' inputs will accept a standard 1/4'' TRS (stereo) plug for balanced operation. The tip is the positive (hot) connection. We recommend using balanced connections wherever possible to ensure that the system is noise free. Connecting a balanced input to an unbalanced output works very well giving almost all of the hum rejection of a truly balanced inter-connection. The key to this connection is to use cable with 2 wires plus a shield. The "ring" connection (return) should be connected to ground at the source ground. This ensures that almost all of the hum created by the interconnection is canceled by the input circuit.

figure 2

figure 3

Unbalanced Inputs

The SR300 will accept an unbalanced 1/4'' connector, however the benefit of balanced interconnection will be lost.

Mono Operation

The SR300 may be operated in mono by plugging into either of the inputs. This signal will be sent to both amplifiers. Each amplifier will be controlled by its corresponding level control. You cannot use the remaining input jack to "loop through" since the amplifier will take this jack as the input for that channel.

To connect a bi-ampable speaker, configure the amplifier for stereo and connect to the appropriate connectors. (e.g. CH A For the Low frequencies and CH B for the High frequencies.)

Short Circuit Protection

The SR300 is fully protected against all possible passive load conditions. It can operate with a "dead" short continuously without damage. (However, we don't recommend that you short your SR300 "just for fun"). Shorts do create a lot of stress on the output devices. The limiting allows for up to 30 degrees of phase shift at 4 ohms or a load impedance of 2.6 ohms with no phase shift.

Cooling & Thermal Protection

The SR300 protects itself against over temperature operation by advancing the current limit until the power output is limited to a safe operating point. With the limiter engaged the level will drop to prevent distortion. This will not occur except at very high temperatures. If the SR300 is to be used for continuous operation at maximum output and into 4 ohms the installer should ensure that adequate ventilation is provided.

Clip LED's

The clip LED's on the front panel will visibly indicate any signal excursion beyond the dynamic headroom of the amplifier.

Signal LED's

The signal LED's will indicate that a signal of low listening level is reaching the amplifier. This is useful when troubleshooting the system. If the LED's are active and no signal is heard from the speakers then the speaker wiring or the speakers are not working. The activity LED's are connected after the level controls, the level controls must be up for the LED's to light.

Limiter LED's

The limiter LED's indicate that the limiter has reduced the gain of the amplifier. If the limiter is engaged but the signal level is below the threshold and the amplifier is not clipping the limiter LED's will not light. This is the normal mode for reference monitor operation.

The limiter in the SR300 serve a dual purpose, keeping the signal level below clipping and preventing excessive continuous power from damaging the speakers. The operation is fast for clipping prevention and slow for continuous power. The continuous power limit is 30 watts into 8 ohms. With normal music the amplifier can easily reach clipping without exceeding this limit. Use of the limiter in conjunction with the filter will prevent the most common damaging signals from reaching the speakers. Current limiting due to over heating or incorrect loads will also trigger the limiter just like clipping.

In applications where it is desired to operate the amplifier at full output the input can be driven about 6 dB higher than required to reach clipping and the limiter will automatically adjust the gain to maintain full output.

Setting the limiter switch out will disable the limiter action. This will not however disable the current limit circuit that protects the output devices.

SubSonic Filter

The SR300 features a specially designed subsonic filter which effectively blocks potentially destructive energy in the band below 35Hz while slightly enhancing the band between 40 and 70 Hz. Engaging this filter produces the perception the same "bottom end", while excessive and possibly damaging excursions of the speaker cone are prevented. The filter provides an 12 dB/Oct skirt below 35Hz and 1dB boost at 50Hz . We recommend using this filter. With the filter disabled, the SR300 is flat down to 20Hz , and rolls off at 12 dB/Oct below that.

SPECIFICATIONS

Continuous Power: (Both Channels driven, 1 KHz, 0.1% THD)

8 Ohms 110 Watts (x2)

4 Ohms 150 Watts (x2)

Burst Power: (Both channels driven, 10m Sec of 1KHz, 0.1% THD)

8 Ohms 125 Watts (x2)

4 Ohms 195 Watts (x2)

Burst Power: (One channel driven, 10m Sec of 1KHz, 0.1% THD)

8 Ohms 140 Watts

4 Ohms220 Watts

Frequency Response: ±1 dB 20Hz - 20 KHz

± 0.5 dB 20Hz - 20 KHz (typ.)

Hum and Noise: < -95 dB re: 150W output (typ, unweighted, 22Hz -22KHz BW)

< -98 dB re: 150W output ("A" weighting)

Distortion: (Both channels driven, -1 dBr full output, 80KHz BW)

<0.008% THD (typ, 1 KHz 8 Ohms)

<0.03% THD (typ, 20 Hz - 20KHz, 8 Ohms)

<0.01% THD (typ, 1 KHz 4 Ohms)

<0.1% THD (typ, 20 Hz - 20KHz, 4 Ohms)

High Pass Filter: -3dB at 35Hz, -12 dB/octave rolloff

Slew Rate: >10 V/uSec

Damping Factor: >400 (20-400Hz, 8 Ohms)

Crosstalk: < - 60 dB 1 KHz

< - 50 dB 20Hz - 20 KHz

Common Mode Rejection: - 50 dB minimum / -65 dB typical at 60 Hz

Turn On/Off transient: < 15 mW-Sec

Maximum Output Current: 10 A RMS burst, 7.5 A RMS Continuous

Power Consumption: 200 Watts (typ), 500 W (max)

Transformer: Toroidal

Protection: Current Limit, Thermal Overload

Cooling: Convection

Size: 38cm × 48cm × 9cm (DWH)

15 in x 19 in x 3.5 in (DWH)

2 Rack Spaces

Weight: 23 lbs. 10.3 Kg

figure 1

INTRODUCTION

8 Ohms 140 Watts
4 Ohms220 Watts

Niagara Falls, New York

14305 USA

Voice: [phone]

Fax: [phone]

Quality and Innovation Since 1963

Printed in Canada