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Offered is „Filter 3-P XLR“ by Octave as new device from the category „passive filters“ on audio-markt.de - the online market place for high-end. The advert with the number 5068503454 ends on 30.11.2026 at 10:58 o'clock.
The timing matters little: the Filter 3-P remains Octave’s current listed model, so this is not an obsolete generation being cleared out. At €1,400, it is a strong deal against the two comparable used listings: below the €1,532 25th percentile and comfortably under the €1,664 median. Even allowing for ordinary variation in condition and RCA/XLR configuration, the price looks notably attractive.
This is a serious passive analogue-signal filter, designed to sit between a DAC and preamp or integrated amplifier, with especially useful common-mode noise rejection and a selectable ground connection. It is well regarded when a system suffers from hum, RF or EMI contamination, and it should not impose the tonal bleaching associated with some conventional filters. Confirm the connector version, test the ground switch and inspect the substantial casework, but with clean operation and the relevant interconnect configuration, this is a worthwhile buying opportunity.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Octave Audio traces its roots to 1968, when Karl Heinz Hofmann established a transformer winding factory in Karlsbad, Germany. His son, Andreas Hofmann, joined in 1975, developing early semiconductor and tube amplifiers. In 2000, Andreas took the helm, rebranding it as Octave Audio to channel his decades-long passion for tube-based electronics into high-end hi-fi components.
The brand specializes in meticulously hand-built tube amplifiers, including preamplifiers, power amps, and integrated models like the V 16 Single-Ended and Jubilee series. Octave emphasizes premium features such as external power supplies, balanced connectivity, adjustable gain, and modular upgrades for phono stages and power conditioning. Their in-house transformer expertise ensures low-noise performance across full-range designs, from 8-watt single-ended units to 30-watt powerhouses.
Positioned firmly in the high-end market, Octave commands respect among audiophiles for its German craftsmanship, sonic purity, and innovative tube technology. Hand-assembled with top-tier components at their Karlsbad headquarters, these amplifiers deliver uncompromising musicality, appealing to discerning buyers seeking perfection over mass production.
See all Octave listings on RADAR.
