Used Powersoft T304 / T604: Buying Guide and Condition Notes

The Powersoft T304 and T604 are 1U four-channel DSP amplifiers that show up regularly on the secondary market, and they are a practical workhorse for rental racks and fixed installs. Both share the same platform: four channels, 4×XLR in and 4×Speakon out, front-panel plus network control, 100–240 V AC operation and a 5.2 kg chassis. The difference is output — T304 delivers 4×300W @ 4Ω, T604 delivers 4×600W @ 4Ω. When you are shopping for used Powersoft T304 / T604 DSP amplifiers for sale, the model number and the channel count matter less than what the unit has been through.

Condition grade A is the baseline you should expect from a serious exporter: cosmetically clean, no missing rack ears or Speakon terminals, and fully tested before dispatch. Ask for the test record, not just the grade. A proper bench check covers all four channels loaded at 4Ω, a signal sweep to confirm no dead channel or intermittent output, DSP preset recall over the network, and a front-panel control check. Because these amps are network-controlled, confirm the network port and the control software handshake before the unit leaves the warehouse.

On the physical side, inspect the fan and heatsink path. A 1U four-channel amplifier runs hot in a dense rack, so dust loading and fan noise tell you how hard it has worked. Look for evidence of prior repair around the power supply, check that the mains inlet and voltage selection are intact for 100–240 V AC operation, and confirm all four XLR inputs and four Speakon outputs are present and undamaged. If the seller cannot show photos of the rear panel and the internals, treat the listing as incomplete.

For rental companies, the T304 and T604 are usually deployed as monitor amps, zone amps or sub/line-array support in compact systems. If you are pairing them with used line array speakers or building a venue sound reinforcement system, buy amplifiers in matched batches so DSP presets and gain structure stay consistent across the rack. Mixed-condition stock creates service headaches later, especially when a single channel fails mid-tour.

Distributors buying for resale should think about documentation and spares. Confirm what firmware the DSP is running, whether the unit has been reset to factory defaults, and whether any lock codes or custom presets are still loaded. For export orders, ask for the packing method — 1U amplifiers ship well in double-walled cartons with foam, but Speakon connectors and rear-panel network ports are the parts most likely to be damaged in transit. This is standard practice across our used pro audio equipment for export range.

Finally, treat quantity as a negotiation point rather than a fixed number. Stock on used Powersoft amplifiers moves quickly, so confirm availability before quoting a client, and request a fresh test on the exact units being shipped. If you are comparing this platform against other four-channel DSP amps, read our second hand amplifier and DSP buying guide before you commit. A grade A T304 or T604 with a documented test is a low-risk purchase; one without paperwork is a gamble.

Questions about this unit or about shipping to your country? Contact us for condition photos, test results and a quote.