Inspired Audio Eflex Q5 Four Channel 2U Lightweight Power Amplifier

The eFlex Q5 is a four-channel system amplifier housed in a 2U lightweight steel chassis that utilises class D amplifier technology to deliver 1250 w per output channel while weighing just 9 kg. The amplifier package also includes full onboard 96 kHz DSP real time monitoring and can be software controlled via network or USB connection. The package offers a level of flexibility than enables Inspired Audio to offer the eFlex Q5 as the only amplifier option for integrated power and management control of single loudspeakers or systems. Internally the channels are grouped in two channel modules which have an independent mains switch and power supply; as a consequence, channel pairs can be easily bridged. This function enables the amplifier to be configured as a four channel, three channel, or two channel unit dependent on the loudspeaker system requirements. Each channel pair also shares a common two in, two out DSP allowing flexibility on programming and product pre-set selection.

The eFlex Q5 benefits from the power density that can be achieved from modern class D switching topology but also combines this with true audiophile performance. A ground up rethink of the topology which has included the use of modern state of the art semiconductors, a short signal path and turning the inherently low level of negative feedback common with switching designs from a disadvantage to an advantage has ensured that sonic issues common on older class D designs have been eradicated. The result is a fast and open sound that is truly sonically transparent. A holistic approach to design has matched the units switch mode power supplies in harmony with the output stages. Potential sources of noise and distortion have been eliminated and a further benefit is the unit’s ability to auto select the mains voltage for global operation.

Software control

The eFlex Q5 uses ‘Podware’ control software and ‘BV Net’ network protocol; both tried and trusted industry standard tools that have been developed by Inspired Audio’s technology partner Linea Research. Software connection can be via the rear panel USB connection or the RJ45 network socket utilizing a BV Net interface box. Alternative options for system control include an Ethernet bridge which allows WIFI connection and integration with the ‘Dante’ digital transmission protocol.

Podware will control a single amplifier or a network of up to 32 amplifiers linked under the BV Net protocol. Amplifiers within the network can be grouped together to allow universal parameter changes across selected amplifiers. The output DSP functions are locked to users and determined by factory pre-set files that cover all EQ, crossover, delay and limiter settings for the product range. On request custom files will also be supplied to cover customers with unforeseen needs or to allow customization within an installation.

Podware also allows a front-end user interface that allows overlay adjustments to EQ, gain and delay, to compensate for local conditions or room acoustics. This function can be defeated via a front panel defeat button that restores the factory pre-set

Regulatory compliance

This product complies with the EMC & LVD directives as issued by the Commission of the European Community. Compliance with these directives implies conformity with the following European standards: • EN55103-1 Electromagnetic Interference (Emission)
• EN55103-2 Electromagnetic Susceptibility (Immunity)
• EN60065 Electrical safety

The eFlex Q5 also meets the requirements of FCC part 15B

General Specifications

Output power (RMS, 20 Hz to 20 kHz, both channels driven):

Per channel:

1250 w into 2 ohms
800 w into 4 ohms
450 w into 8 ohms

Per bridged pair:
2500 w into 4 ohms
1600 w into 8 ohms
900 w into 16 ohms

Input impedance:
10 k Balanced

Maximum input level:
+20 dBu

Input gain:
26.8 dB (32.8 dB bridged)

Frequency response (4 ohm):
20 Hz - 20 kHz +/-0.5 dB

Output noise:
- 106 dB A weighted, (Ref max output, 22 kHz BW)

Distortion:
< 0.05% (1 kHz, -3 dB output. 22 kHz BW)

Slew rate:
>80 V/us

Damping factor:
120 (ref 8 ohms)

Efficiency:
>90% typical

Power supply:
Dual, high current, high frequency, switch mode

Mains voltage:
115 v/230 v +/- 10%

Mains frequency:
45 - 65 Hz

Mains frequency selection:
Automatic

Other PSU features:
Automatic soft-start, Automatic brownout recovery, Remote shutdown, Automatic over voltage protection

Temperature range:
0 to +40° C

Humidity range:
0 to 80% (non-condensing)

Thermal management:
3 off variable speed fan