Polk Audio SDA 2B (Real Wood)

Specs

3-way configuration,

closed box (passive radiator),

bass radiator Polk Audio SW121 300mm, rubber surround,

polymer cone midwoofer Polk Audio MW 6503 165mm, SDA dimensional driver, rubber surround,

polymer cone midwoofer Polk Audio MW 6511 165mm, stereo driver, rubber surround,

dome tweeter Polk Audio SL 2000 25mm, silver coil,

Stereo Dimensional Array,

30-350W@6Ω,

16-20000Hz ±? dB,

38-20000Hz -3 dB,

sens. 90 dB,

mm 420x1005x290, kg 36,3.

Proton AM-452

Specs
2x25W@8Ω/20-20000Hz,

2x2 Sanken A1186 C2837 power transistors,
4x2200µF Panasonic filter caps,
Panasonic SU components,

pre out,

phono mm,

mm 446x80x332, kg 6.

Rotel RA-840BX4

Specs

50Wx2@8Ω/20-20000Hz,

4x2 B817 D1047 power transistors,

2x8200µF Rubycon filter caps,

Elna, Nichicon Muse / BP, Rubycon Black Gate F components,
toroidal power transformer,

phono mm / mc,

mm 444x86x346, kg 7,2.

Heybrook Point Five

Specs

2-way configuration,

closed box,

paper cone midwoofer Heybrook 180 HB 0.5 180mm,

aluminium frame, rubber surround,

aluminium dome tweeter Seas Prestige 19 TAF/G H414 19mm,

19mm aluminium voice coil, mesh grid,

**-***W@6Ω,

**-20000Hz ±3 dB,

sens. -- dB,

mm 230x400x230, kg 5,9.

Polk Audio Monitor 4 Series 2

Specs

2-way configuration,

bass reflex via front-firing plastic port,

tri-laminate polymer cone midwoofer Polk Audio MW 6502 165mm,

die cast frame, rubber surround,

tweeter Polk Audio SL 1500 25mm,

20-100W@8Ω,

35-25000Hz ±3 dB,

sens. 88 dB,

mm 216x362x190, kg 5,4.

Pioneer A-400

Specs

2x50W@8Ω/20-20000Hz,
2x70W@4Ω/20-20000Hz,

2x2 Toshiba 2SA1302 2SC3281 power transistors,
2x10000µF Pioneer (Elna) filter caps,
Elna Duorex, Nippon Chemicon AS / NX-V, Panasonic AU components,

phono mm / mc,

mm 420x126x352, kg 8,0.

Pioneer CT-757

Specs
3 heads (R: Hard Permalloy, P: Hard Permalloy, E: double gap Ferrite),
3 DC motor,
full logic,
4 digit linear / r/t counter,
Dolby B-C NR HX Pro, mpx,

motorized tape loading,

meter range selector,

Nichicon Great Supply, Nichicon Muse, Panasonic AU, Nippon Chemicon ASF / AS, Elna components,

No 15-21000 Hz (-20dB vu),

CrO2 15-21000 Hz (-20dB vu),
Me 15-22000 Hz (-20dB vu),
S/N 60 dB (Dolby off), 70 dB (Dolby B, 5 kHz), 79 dB (Dolby C, 5 kHz),

W&F 0,024% (wrms),

mm 420x135x370, kg 7,3.

Tdk SF (1990)

Specs
IEC II tape
100 mins

Sony HF-ES (1990)

Specs
IEC I tape
46 mins