{"product_id":"threshold-3-piece-combo-fet-10hl-s-1000-monos-a-pass-masterclass","title":"Threshold 3-Piece Combo, FET-10hl \u0026 S-1000 Monos, a PASS Masterclass","description":"\u003cp\u003e\u003cspan\u003eThe audio engineer, \u003cstrong\u003eNelson Pass\u003c\/strong\u003e, is widely revered in the audiophile community for his pioneering designs of solid-state Class-A amplifiers and his generous contributions to the DIY audio hobbyist world.  Part of Pass's \u003c\/span\u003ecareer landed him at Threshold, a company founded in California in 1974.  \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe company built a legendary reputation in the high-end audio market for its patented STASIS technology and pioneering solid-state Class-A designs...all at the hands of Nelson Pass. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eThreshold S-1000\u003c\/strong\u003e was available at its introduction as both a stereo and dedicated mono amplifier.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eThe S-1000 amps were expensive in their day, and thus, rare today.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eMono examples are even harder to find.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eHere we have a matched pair of S-1000 mono block amplifiers.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eCombined with a stunning \u003cstrong\u003eFET-10hl \u003c\/strong\u003eactive analog preamplifier with outboard 15 volt DC power supply.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eThis\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003ecombo is absolutely some of the finest amplification we have had come through the shop, old or new.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe S-1000s together are a highly capable combo from Nelson Pass's revered vintage era. Utilizing a rugged bipolar architecture, the S-1000 monos deliver \u003cstrong\u003e500 watts RMS power into an 8 ohm load\u003c\/strong\u003e.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003e(Up to 100 watts of that in Class-A mode) Running a 4 ohm load? Sure, that’s easy work with more than 1,000 watts of power being transplanted to your speakers, or your welding iron. Impressive, insane, clean power.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eThese amps provide commanding, high-current drive capability for demanding, low-impedance loudspeaker loads.\u003c\/p\u003e\n\u003cp\u003eAt the core of each S-1000 lies the celebrated \u003cstrong\u003eSTASIS\u003c\/strong\u003e topology. This design splits the output stage into two distinct sections: an ultra-linear, low-power loop that operates in pure Class-A to ensure flawless voltage stability, and a high-power current-bootstrap daughter section. By decoupling the voltage and current duties, the amplifier dramatically reduces Total Harmonic Distortion (THD) while preserving dynamic headroom.\u003c\/p\u003e\n\u003cp\u003eTo support its massive power delivery, the S-1000 employs an over-specified linear power supply that easily handles current peaks. The physical construction is robust, incorporating extensive extruded aluminum heatsinks and dual temperature-sensitive, speed-controlled fans to maintain thermal equilibrium.\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003eThese amps are big, heavy, and built to last decades…They already have!\u003c\/p\u003e\n\u003cp\u003eNot to be outdone, the \u003cstrong\u003eFET-10hl \u003c\/strong\u003epreamplifier is a clean-running marvel all its own. Substituting heft for finesse, the FET-10hl is renown for its pristine sonic transparency. Utilizing an entirely discrete J-FET and MOSFET topology with zero op-amps in the signal path, it achieves ultra-wide bandwidth 1.5 Hz - 150 kHz gain with exceptionally low distortion. By isolating the sensitive gain modules and utilizing an over-dimensioned outboard power supply, the preamp eliminates electromagnetic interference, delivering uncompromising signal purity.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eIf you want big, bold, and uncompromising vintage sonic quality, this is the combo for you.\u003c\/em\u003e\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eDemos are encouraged in Andover, MA.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003e$6,999 for the set (plus applicable shipping and\/or MA sales tax)\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"Holt Hill Audio","offers":[{"title":"Default Title","offer_id":43339291918403,"sku":null,"price":6999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2197\/6387\/files\/ThresholdCombo01.jpg?v=1780520566","url":"https:\/\/holthill.com\/products\/threshold-3-piece-combo-fet-10hl-s-1000-monos-a-pass-masterclass","provider":"Holt Hill Audio","version":"1.0","type":"link"}