Pioneer AS-305A (1977)

In 1977, a box labeled "AS-305A" held a 12-inch, 3-way, 5-driver floorstander. It was built from matched Pioneer parts, wired and ready to assemble.

Overview

The Pioneer AS-305A wasn't a finished speaker you could plug in. It was a do-it-yourself kit for a custom 12-inch, 3-way, 5-speaker system designed for high-fidelity sound. It was aimed at the hands-on audiophile, not the mass-market bookshelf buyer. Pioneer didn't sell a box of loose drivers and a schematic. The crossover came fully wired and pre-assembled, with level controls already built in. The drivers were carefully matched units pulled from their broader lineup of quality speakers, so the system was engineered to work as a whole, even with you bolting it together.

A kit like this sounds like a budget move, but the specs say otherwise. The AS-305A had a 12-inch woofer, a 5-inch midrange and a 3-inch cone tweeter. The 3-way design split the signal at 800Hz and 3kHz, so each driver handled its own range. Frequency response ran from 30Hz to 20kHz, which was no small feat for a consumer-grade system in the late 1970s. It stood 640 mm tall and weighed 23 kg. It was a floorstanding bass reflex system, and it did not disappear into the room.

Pioneer did a lot of the work before the first screw was turned. The crossover wasn't a bare board. It was a complete, pre-wired unit with level controls, so adjusting output balance took no soldering iron or multimeter. With an 8-ohm impedance and 40-watt power handling, it suited the solid-state receivers of the era, from Pioneer's own SA series to competitors' gear.

Specifications

Manufacturer	Pioneer
Product type	Speaker assembly kit
System type	3-way
Number of speakers in system	5
Woofer	12-inch
Midrange	5-inch cone
Tweeter	3-inch cone
Crossover frequency	800Hz and 3kHz
Impedance	8 ohms
Power handling	40 watts
Frequency response	30Hz - 20kHz
Dimensions (H x W x D)	640 x 380 x 300 mm
Weight	23 kg
Enclosure	Bass reflex type
Design	3-way, 3-speaker bass reflex system

Key Features

Pre-Wired, Fully Assembled Crossover

The crossover was the standout part of the AS-305A kit. It came fully assembled and wired, with level controls already integrated. Owners didn't have to source components, calculate values, or risk a wiring mistake. For a DIY product, that was a major advantage. The dual crossover points at 800Hz and 3kHz separated the woofer, midrange and tweeter cleanly, which reduced distortion and let each driver work where it was strongest.

Matched Driver Selection

The kit didn't use generic or off-the-shelf drivers. It was made up of carefully matched units selected from Pioneer's own range of quality speakers. That meant tighter tolerances, consistent performance between left and right channels, and a cohesive sound signature. In an era when speaker matching was often left to chance or dealer stock, that was a real benefit.

Bass Reflex Floorstanding Design

With a 12-inch woofer and a bass reflex enclosure, the AS-305A was built to move air. The 30Hz lower limit was meant to give real bass that could fill a room without a subwoofer. The cabinet's 640 mm height and 380 mm width provided the internal volume for that, and the bass reflex port improved efficiency and extension. At 23 kg, it wasn't light.

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