Power Amplifiers

A 70 V or 100 V amplifier drives many speakers in parallel on one line, each with a transformer tap, which suits ceiling speakers spread across offices, shops and hotels. A low-impedance amplifier drives a few speakers at 2 to 8 Ω, which suits full-range and subwoofer cabinets.

Bose PowerShare and PowerShareX channels can be set for 4 to 8 Ω or 70 V / 100 V. The Bose FreeSpace IZA 2120-HZ is a 70 V / 100 V model and the IZA 2120-LZ a low-impedance model.

Bose PowerShare lets a 4-channel amplifier distribute its total power unevenly across its outputs, so a busy zone can use power that a quieter zone does not need. The Bose PowerShare PS404D shares 400 W and the PS604D shares 600 W across 4 channels.

Without sharing, the PS604D is rated 150 W per channel. This means the amplifier can be sized for the total system load rather than for the largest zone, and spare power can be used for later changes.

Bose rates the PowerShareX PSX1204D at 300 W per channel, the PSX2404D at 600 W per channel and the PSX4804D at 1,200 W per channel, each into 4 Ω, 8 Ω, 70 V or 100 V with all 4 channels driven.

All three are 1RU Class D amplifiers with 4 analog and 4 Dante inputs, weighing 7.0 kg. Power can also be shared unevenly across channels, as on the PowerShare range.

The d&b D40 and 40D have the same output power, 4 × 2,400 W into 4 Ω and 4 × 2,000 W into 8 Ω, but the D40 is built for mobile touring use and the 40D for permanent installations.

The 40D is a 2RU unit weighing 13.3 kg with Euroblock connectors for AES3 and GPIO, while the D40 uses touring connectors. Both accept 8 Milan network inputs, 4 analog and 4 AES3 channels.

The d&b 5D is the compact choice: a 4-channel installation amplifier in 1RU at half rack width (9.5 inches), weighing 4.6 kg, rated 4 × 600 W with flexible power sharing between outputs.

It takes 4 analog inputs and 4 Dante channels and drives selected d&b E-Series, xS-Series, xC-Series and T-Series loudspeakers. For more power in a permanent install, d&b offers the 10D at 4 × 700 W into 4 Ω and the 40D at 4 × 2,400 W into 4 Ω.

A d&b touring rack is a fully equipped, prewired system rack holding 3 or 6 amplifiers, with mains power distribution, connector panels and internal cabling, so a touring system can be set up quickly.

This collection lists D40, D80 and D90 touring racks in several versions, some with an audio network bridge. Several listings are marked NEMA or US mains versions, so confirm the mains panel version for UAE 230 V supply before ordering.

A Bose FreeSpace IZA is a mixer amplifier that combines music inputs, a paging microphone input and a power amplifier in one rack unit for small commercial zones. The IZA 190-HZ is rated 90 W at 70 V or 100 V in a half-rack-wide 1RU chassis.

The IZA 2120-HZ provides 2 × 120 W at 70 V or 100 V, and the IZA 2120-LZ 2 × 120 W at 4 Ω. Bose ControlCenter CC-1 and CC-2 wall plates add local volume and source control.

The Shure MXN-AMP is a PoE+ powered amplifier rated at 14.5 W combined output, enough for up to 4 Shure MXP loudspeakers in 8 Ω mode or up to 8 MXP-5 or MXP-6 loudspeakers in 70 V mode.

It has 4 Dante inputs and 4 Dante outputs, so it takes audio directly from a Dante processor or Shure conferencing system, and it needs no mains outlet at the ceiling or rack because it is powered from the network switch.

d&b audiotechnik rates the D80 at 4 × 4,000 W into 4 Ω. It is a 4-channel touring amplifier in 2RU, 530 mm deep, weighing 19 kg, with an autosensing power supply and active power factor correction.

d&b also offers the D80 in prewired touring racks of 3 or 6 amplifiers. The D90 goes further, rated 4 × 5,400 W into 4 Ω and 4 × 2,700 W into 8 Ω, with 8 Milan network inputs.

Add up the transformer taps of all speakers on each channel and choose a channel rating above that total, with spare capacity for later speakers. For example, 20 speakers tapped at 6 W need 120 W, so a 150 W channel fits.

In this collection, a Bose PowerShare PS604D gives 4 × 150 W, or 600 W shared, and a PowerShareX PSX2404D gives 4 × 600 W at 70 V. Check each channel's tap total before connecting it.