BT20A
amplifier
$80
Gebrauchtmarkt: $60*
Technische Daten
3 von 6 Werten mit vermerkter QuelleKommentar des Toningenieurs
Headroom Notes
The plain BT20A, not the BT20A MAX already in this catalogue: a 24 V / 4.5 A supply, ATS2853 Bluetooth, and 100 W x 2 into 4 ohms across 20 Hz - 20 kHz at 0.04 % THD. Fosi's description also invites you to drive '280 watts (8 ohms) and 320 watts (4 ohms)' speakers, which is a statement about the speakers' power handling and not about what this amplifier delivers into them.
Thermal Behavior
Same page layout, same numbers and the same internal contradiction as Fosi's TB10A: the load range of 2 - 8 ohms is stated only in the specification table, and the distortion figure differs between the table and the description.
Was im Datenblatt tatsächlich steht
Wörtlich von der Herstellerseite zitiert, mit dem Datum der Prüfung. Wir behaupten das Gedruckte, nicht die Absicht dahinter.
«Specifications: THD ≤ 0.5%; Output power 100W + 100W — against the description above it: '100W X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD)'»
The specification table gives the power without naming a load and the distortion as ≤ 0.5 %, while the description above gives the same power into 4 ohms at 0.04 % - a twelvefold difference in the distortion limit on one page. Fosi repeats this layout across the TB10A and the T20; only the description carries the measurement conditions.
geprüft am 5.8.2026* Geschätzt über das Abschreibungsmodell (~75% Restwert). · geprüft am 5.8.2026