Pioneer D-23
(1978 - 1983)

Available well into the 1980s, the Pioneer D-23 was advertised a lot, sold ok but not that much in the end. It was preceded by the SF-70, later complemented by smaller equivalents like the D-70, and part of the famous Series 20.

Right is an image from a may 1979, german Hifi Exclusiv test - a photocopy of it at any rate which nevertheless shows the guts of the D-23. Other units tested were the Sony TA-D88B, Accuphase F-5 and Mark Levinson LNC-2. Winner of this test was, sorry guys, the Sony :D

The test shows a better s/n ratio than spec'ed by up to 5dB, some divergence on frequencies depending on volume/slope (mainly at 500Hz which in fact turns out to be 466Hz, so a 6,8% error) and some overshoot at the 18dB slope due to the Butterworth structure. The specs here published are a mix of of those from Pioneer and those from said test - a bit more accurate ;)

LOW & MID-LOW crossover:
MID-LOW & MID-HIGH crossover:
MID-HIGH & HIGH crossover:
Slopes:
Volume:


L/R volume pot accuracy:
Stereo separation:
Rise time:



Input:
Output impedance:


THD:
S/N ratio:
Frequency response:

PC:
Dimensions:
Weight:
List price:

63 / 80 / 100 / 125 / 160 / 200 / 250 / 320 / 400 / 500 / 630Hz
320 / 400 / 500 / 630 / 800 / 1k / 1,25k / 1,6k / 2k / 2,5k / 3,2kHz
1,6k / 2k / 2,5k / 3,2k / 4k / 5k / 6k / 8k / 10k / 12,5k / 16kHz.
6 or 12 or 18dB per octave
linked L/R pots
0dB to -30dB by 1dB steps
-30dB to ¬
0,7dB
50,5dB (high outputs)
0,7mS (6dB slope)
1,5mS (12dB slope)
1,3mS (18dB slope)

50kOhm [110kOhm??]
190Ohm (low)
90Ohm (mid)
70Ohm (high)
0,005% (20Hz...20kHz at 1V output)
100dB (1V output)
10Hz...100kHz (+0 / -1dB)

14W
42 x 15 x 35,2cm
8,7kg.
1900DM (1979)