{"product_id":"closer-acoustics-bi-amp-interface","title":"Closer Acoustics Bi-Amp Interface","description":"\u003ch2\u003e\u003cb\u003ePassive line-level cable splitter for wideband + bass systems\u003c\/b\u003e\u003c\/h2\u003e\n\u003ch3\u003e\n\u003cb\u003eWhat is it?\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003eCloser Acoustics Bi-Amp Interface\u003c\/b\u003e is a high-quality passive line-level interface designed as a dedicated Y-splitter cable.\u003c\/p\u003e\n\u003cp\u003eIt features a \u003cb\u003efixed low-frequency crossover\u003c\/b\u003e, created for purist bi-amping systems where simplicity, coherence and signal integrity are the highest priorities.\u003c\/p\u003e\n\u003cp\u003eIt allows a single source (\u003cb\u003ePhono, CD Player, DAC or Streamer\u003c\/b\u003e) to feed \u003cb\u003etwo integrated amplifiers simultaneously\u003c\/b\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eone amplifier driving the \u003cb\u003ewideband (full-range) loudspeakers\u003c\/b\u003e,\u003c\/li\u003e\n\u003cli\u003ea second amplifier driving the \u003cb\u003ededicated bass modules\u003c\/b\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAll filtering is performed \u003cb\u003eat line level\u003c\/b\u003e, using a carefully tuned passive RC network integrated directly into the cable.\u003c\/p\u003e\n\u003cp\u003eThere is \u003cb\u003eno DSP, no active electronics and no power supply\u003c\/b\u003e involved.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eIntended system topology\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eThis interface is designed specifically for systems based on a \u003cb\u003ewideband driver supported by a separate bass module\u003c\/b\u003e, powered by two integrated amplifiers with independent volume controls.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003cb\u003eWideband Amplifier\u003c\/b\u003e receives a \u003cb\u003efull-bandwidth signal\u003c\/b\u003e, with no filtering.\u003c\/li\u003e\n\u003cli\u003eThe \u003cb\u003eBass Amplifier\u003c\/b\u003e receives a \u003cb\u003elow-pass filtered signal\u003c\/b\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis preserves the fundamental advantage of wideband systems:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eno electrical crossover components between amplifier and wideband driver,\u003c\/li\u003e\n\u003cli\u003eno energy storage or phase disturbance in the midrange,\u003c\/li\u003e\n\u003cli\u003ea single driver handling the most sensitive part of the audio spectrum.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eKey advantage: No L-pads in the signal path\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional loudspeaker crossovers, the Bi-Amp Interface allows \u003cb\u003eprecise level matching\u003c\/b\u003e between drivers \u003cb\u003ewithout using L-pads or resistors in the loudspeaker signal path\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp\u003eIn conventional systems, matching a high-efficiency wideband driver with a bass module requires dissipating excess energy as heat, which inevitably reduces dynamics and immediacy.\u003c\/p\u003e\n\u003cp\u003eWith the Bi-Amp Interface:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ethe wideband driver remains \u003cb\u003edirectly coupled to its amplifier\u003c\/b\u003e,\u003c\/li\u003e\n\u003cli\u003edynamics, micro-detail and tonal openness are preserved,\u003c\/li\u003e\n\u003cli\u003elevel matching is performed \u003cb\u003eat the amplifier level\u003c\/b\u003e, not in the loudspeaker signal path.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eElectrical concept\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePure Path\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe wideband branch is designed for maximum transparency, keeping the signal path as direct and unencumbered as possible in the midrange and high frequencies.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTuned Bass Filter\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe bass branch incorporates a precision-tuned passive network, providing a smooth \u003cb\u003e6 dB\/octave\u003c\/b\u003e low-frequency roll-off.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance Requirement – IMPORTANT\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe bass filter is tuned for use with bass amplifiers featuring an input impedance of \u003cb\u003e47 kΩ or higher\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp\u003eUsing an amplifier with lower input impedance will shift the crossover frequency and increase insertion loss.\u003c\/p\u003e\n\u003cp\u003eIf you are unsure about your amplifier’s input impedance, please consult the manufacturer or contact us before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eVerified Performance\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e        Measured and verified using the CLIO measurement system.\u003c\/p\u003e\n\u003cp\u003eA representative frequency response plot is included.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eProfessional Build\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eConstructed using low-capacitance professional cabling and original \u003cb\u003eAmphenol RCA connectors\u003c\/b\u003e for stable, low-loss signal transfer.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eAvailable versions\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eBass 72 Hz \u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA balanced and musically natural crossover point tuned to match OKHO wide band unit, offering weight, scale and coherence without compromising the character of the wideband driver.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eBass 43 Hz\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eOptimized tuning for OGY monitors.\u003c\/p\u003e\n\u003ch2\u003e\n\u003cmeta charset=\"UTF-8\"\u003e \u003cb\u003ePolarity note – IMPORTANT\u003c\/b\u003e\n\u003c\/h2\u003e\n\u003cp\u003eDue to the electrical phase behaviour of a first-order passive line-level crossover, the \u003cb\u003ebass section must be connected with inverted polarity\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp\u003eThis means:\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003ethe \u003cb\u003eloudspeakers driven by the bass amplifier must be connected with reversed polarity\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e(positive to negative, negative to positive at the loudspeaker terminals).\u003c\/p\u003e\n\u003cp\u003eThis configuration ensures optimal acoustic summation in the crossover region and the most coherent integration between the wideband driver and the bass module.\u003c\/p\u003e\n\u003ch3\u003e\n\u003cb\u003eHow to connect\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e1.\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eConnect the input of the Bi-Amp Interface to your source (\u003cb\u003ePhono, CD Player, DAC or Streamer\u003c\/b\u003e).\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e2.\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eConnect the branch marked \u003cb\u003eBASS 72 Hz\u003c\/b\u003e (round enclosure) to the amplifier driving the bass modules.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e3.\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eConnect the remaining branch to the amplifier driving the wideband loudspeakers.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e4.\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eUse the volume controls on both amplifiers to achieve precise level matching between wideband and bass.\u003c\/p\u003e\n\u003ch4\u003eImportant:\u003c\/h4\u003e\n\u003cp\u003eThe BASS branch must be connected to an amplifier with \u003cb\u003e47 kΩ or higher input impedance\u003c\/b\u003e to ensure correct crossover frequency and proper level behaviour.\u003c\/p\u003e\n\u003ch3\u003e\n\u003cb\u003ePractical note: multiple sources\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/h3\u003e\n\u003cp\u003eAs the filtering is integrated directly into the cable, we recommend using a \u003cb\u003eseparate Bi-Amp Interface for each source\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp\u003eThis avoids additional switchboxes or preamplifiers and keeps the signal path as short and interference-free as possible.\u003c\/p\u003e\n\u003ch3\u003e\n\u003cb\u003eWhat this product is NOT for\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"UTF-8\"\u003e\n\u003cspan\u003eNot intended for bass amplifiers with input impedance below \u003c\/span\u003e\u003cb\u003e47 kΩ\u003c\/b\u003e\u003cspan\u003e (unless a custom version is specified).\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eDo not connect between an amplifier and loudspeakers.\u003c\/li\u003e\n\u003cli\u003eNot intended for power amplifiers without volume control.\u003c\/li\u003e\n\u003cli\u003eNot a substitute for a DSP crossover.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Stereopolis","offers":[{"title":"Bass 72 Hz","offer_id":53762683076948,"sku":null,"price":250.0,"currency_code":"EUR","in_stock":true},{"title":"Bass 43 Hz","offer_id":53762683109716,"sku":null,"price":250.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0640\/5911\/3731\/files\/biampinterface72i43razem.jpg?v=1771417583","url":"https:\/\/www.stereopolis.com\/products\/closer-acoustics-bi-amp-interface","provider":"Stereopolis","version":"1.0","type":"link"}