USERS GUIDE STEREO POWER AMPLIFIER DPA 6.
DPA 6.
DPA 6.4 UNPACKING Please read the User Guide carefully before attempting to use this apparatus. The Users Guide comprises general and specific information on adaptations/adjustments to give you the best possible performance of the apparatus. Please store the packing materials for later use. When the apparatus is unpacked, please check that it has not been exposed to any damage and that the package contains the following items: 1 pc. Dynamic Precision DPA 6.4 2 pcs. mains fuses T5A. IEC127 1 pc.
DPA 6.4 GENERAL INFORMATION We congratulate you on your choice of a Dynamic Precision DPA 6.4. The technical performance of this product is based on the company’s unique electronics circuit design to achieve the best possible musical reproduction. This apparatus is electronically balanced and DC-coupled to optimise pulse response and low noise. All Dynamic Precision products are wide bandwidth products (see page 10), so please observe the following: 1.
DPA 6.4 CAUTION: READ THIS BEFORE OPERATING Dynamic Precision DPA 6.4. 1. Do not open the amplifier's cabinet as this might result in damage to the set, or electrical shock. 2. To prevent lightning damage, pull out the power cord during an electrical storm. 3. When removing the power plug from the wall outlet, always pull directly on the plug, never pull the cord itself. 4. Do not use force when operating the switches. 5.
DPA 6.4 SWITCHES AND INDICATORS Figure 1. DPA 6.4 front panel SWITCHES Power supply OFF/ON switch. INDICATORS SIGNAL: Indicates an input signal of at least 5 mV. CLIP: Indicates ≥ 1% harmonic distortion on the output signal. POWER: Indicates that the amplifier is turned on. STANDBY: Illuminates for a while when the power is turned on, and during the following situations: 1. 2. 3. Temperatures higher than 110 °C measured on the cooling bracket. DC-voltage on either input or output terminals.
DPA 6.4 CABLES AND CONNECTIONS Figure 2. DPA 6.4 back panel. CONNECTIONS Note: All cables to be connected prior to turning the power on. The preamplifier, crossover network or any other equipment shall be turned on prior to the power amplifier. SIGNAL INPUT AND OUTPUT TERMINALS: This power amplifier is equipped with electronically balanced inputs using XLR-terminals (female). Pin allocation is as follows: • • • Pin 1 = GND/shield Pin 2 = signal (+) in phase Pin 3 = signal (-) anti-phase DPA 6.
DPA 6.4 CABLES AND CONNECTIONS AUDIO CABLES Balanced cables The audio inputs are equipped with XLR-terminals (male and female). Balanced signal sources shall always be connected using balanced cables as shown in Figure 3. The benefit of a totally balanced system is that any noise superimposed on the signal paths will be cancelled on the input. On the other hand, when using an unbalanced system there is no control of the noise in the system.
DPA 6.4 PARALLEL MONO / BRIDGING SET-UP BRIDGING: Figure 5 Special cable used to bridge the power amplifier. XLR-Female XLR-Male 1 1 2 2 3 3 Loudspeaker, plus (+) (-) Input signal Figure 6 Loudspeaker, minus Bridging using a special cable. Note: Bridging will result in an output power four times higher than the single channel stereo output. Please consult the technical specifications on page 10.
DPA 6.4 PARALLEL MONO / BRIDGING SET-UP PARALLEL MONO SET-UP: Figure 8 XLR-cable for parallel mono connection of the power amplifier. XLR- Female XLR-Male 1 1 2 2 3 3 Loudspeaker Bass section Input signal Figure 7 Loudspeaker Treble section Parallel mono connection using an XLR-cable. The loudspeakers must be equipped with separate connectors for the bass and treble sections. Remember to remove the strap between the bass and treble sections on the loudspeakers.
DPA 6.4 TROUBLESHOOTING SYMPTOM Apparatus is put in STANDBY. POSSIBLE CAUSE 1: High frequency noise POSSIBLE SOLUTION 1: Insert a mains filter between the power amplifier and the main outlet. 2: Problem with the signal cable. 2: Check for proper grounding/shield of the cables, or replace the cables. 3: DC on the inputs. 3: Check if DC is present on the signal source output. 4: Overheating. 4a: Check if the loudspeaker cables are partially shortcircuited, or replace the cables.
DPA 6.4 TECHNICAL SPECIFICATIONS DPA 6.4 OUTPUT POWER, RMS, 20Hz-20kHz, @ 1% THD (clipping level) : 8Ω 4Ω 2Ω 8Ω Maximum output current: More than 60A per channel (120A peak) DISTORTION, THD @ 400W 20Hz-20kHz in a 4 Ω load: Less than 0.002% DISTORTION, THD @ 35V RMS, 1 kHz: Less than 0.0002% IM DISTORTION, CCIR 13 kHz and 14 kHz, 8 Ω load: Less than 0.0003% (typical 0.
DPA 6.4 WARRANTY DURING THE WARRANTY PERIOD The warranty and purchasers/vendors contractual obligations are in accordance with the Sale of Goods Act. All warranties shall be void if any carelessness, misuse and/or unacceptable handling of the apparatus or any other conditions, which may be ascribed to the negligence of the purchaser of this product.
