MEASURES
-
Rails: +/- 24VDC under load
-
DC offset at speaker teminals: +/- 2mV
-
BIAS: 1.3A (0.61V on R13/R14)
-
Voltage gain: 10 (20dB)
-
THD+N (at 1 Watt into 8 Ohms at 1kHz): 0.08%
-
THD (at 1 Watt into 8 Ohms at 1kHz): 0.04%
MEASURES
-
Rails: +/- 24VDC under load
-
DC offset at speaker teminals: +/- 2mV
-
BIAS: 1.3A (0.61V on R13/R14)
-
Voltage gain: 10 (20dB)
-
THD+N (at 1 Watt into 8 Ohms at 1kHz): 0.08%
-
THD (at 1 Watt into 8 Ohms at 1kHz): 0.04%
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NOTES
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R7 changed to 52.3k to remove excess negative DC offset at the output of the amp
-
R4 changed to 8.2 Ohms and 220uF bipolar capacitor added to remove DC offset at Edcor input (pin 1)
-
Boards, Edcor transformers and MOSFETs from TeaBag
-
Harris IRFP9240 MOSFETs
-
Matched Toshiba JFETs from FET Audio
-
Dual mono implementation
-
2 x 250VA transformers from Toroidy - 230V primary, 2x18V secondary
-
8 x 22000uF KEMET PEH200 in power supply
-
Deluxe 4U chassis from Hi-Fi 2000
RESOURCES
-
Manual: First Watt M2
-
diyAudio: Official M2 schematic, M2 Clone boards with 120mm UMS spacing
-
Other: Edcor
Last update: 10.03.2019.
NOTES
-
R7 changed to 52.3k to remove excess negative DC offset at the output of the amp
-
R4 changed to 8.2 Ohms and 220uF bipolar capacitor added to remove DC offset at Edcor input (pin 1)
-
Boards, Edcor transformers and MOSFETs from TeaBag
-
Harris IRFP9240 MOSFETs
-
Matched Toshiba JFETs from FET Audio
-
Dual mono implementation
-
2 x 250VA transformers from Toroidy - 230V primary, 2x18V secondary
-
8 x 22000uF KEMET PEH200 in power supply
-
Deluxe 4U chassis from Hi-Fi 2000
RESOURCES
-
Manual: First Watt M2
-
diyAudio: Official M2 schematic, M2 Clone boards with 120mm UMS spacing
-
Other: Edcor
Last update: 10.03.2019.
Faital 3WC-10
Designed by Troels Gravesen. 3-way classics using professional Faital drivers for bass and midrange and SB Acoustics beryllium tweeters.
DRIVERS & CROSSOVERS
CABINETS
STANDS
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SPECS:
-
Sensitivity: 91 dB/2.8 V/1 meter
-
Impedance: 4-8 Ohms, minimum 4 Ohms @ 125 Hz
-
Dimensions: 32 x 34 x 68 cm, W x D x H
-
Drivers: Faital 10RS350, Faital 6RS140-8, SB Acoustics SB29BAC-C000-4
NOTES:
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Cabinets built from 19mm Valchromat (high density fibreboard) cut by Atlantic Timber. Measured panel thickness: 19.65mm.
-
Stands built from 19mm Valchromat cut by S.L. Hardwoods
-
American Maple paper backed wood veneer from The Wood Veneer Hub
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Cabinets finished using Osmo Polyx Oil
LINKS
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Troels Gravesen's website: Faital 3WC-10, Tips and ideas, Cabinet damping
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Speaker kits: Jantzen Audio
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Faital drivers: Lean Business Audio
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Electronic components and loudspeaker accessories: HiFi Collective, Willys Hifi
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Cabinets: Peter Rawlings videos, Wood Finishes Direct
Last update: 06.06.2023.