{"product_id":"spl-audio-passeq-passeq-passive-equalizer","title":"SPL Audio Passeq Passeq Passive Equalizer","description":"\u003cimg src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/elementor\/thumbs\/SPL-Audio-Passeq-Passeq-Passive-Equalizer-1-1-rgcklmfow1t12v7etb7pu2hj16qwvbfbvwyro93wg0.webp\" title=\"SPL Audio Passeq Passeq Passive Equalizer (1) (1)\" alt=\"SPL Audio Passeq Passeq Passive Equalizer (1) (1)\" loading=\"lazy\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\u003ch1\u003ePASSEQ\u003c\/h1\u003e\t\t\t\t\n\t\t\u003cp\u003ePassive Mastering Equalizer\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--StartFragment --\u003e\u003c\/p\u003e\u003cp\u003eIn the PASSEQ we have revived the concept of the passive equalizer that was used in the 50’s and 60’s. The charming sound of this vintage technology combined with the modern 120V technology results in a very special equalizer.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/elementor\/thumbs\/SPL-Audio-Passeq-Passeq-Passive-Equalizer-2-rgckm2erce8xuo9naolafmrb2gzt1nm07850e6uww0.webp\" title=\"SPL Audio Passeq Passeq Passive Equalizer (2)\" alt=\"SPL Audio Passeq Passeq Passive Equalizer (2)\" loading=\"lazy\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\u003cp\u003eCut\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eBoost\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg width=\"850\" height=\"727\" src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/2025\/12\/imgi_9_PASSEQ-red_Left.jpg\" alt=\"imgi_9_PASSEQ-red_Left\" title=\"imgi_9_PASSEQ-red_Left\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\u003cp\u003eOnly one filter​\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eAll control functions are part of only one passive filter.\u003c\/p\u003e\u003cp\u003eThere are three frequency ranges:\u003c\/p\u003e\u003cp\u003eLow Freq \/ Mid Freq \/ High Freq\u003c\/p\u003e\u003cp\u003eEach with a cut control on the left and a boost control on the right.\u003c\/p\u003e\u003cp\u003eIn the middle is the output control.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--StartFragment --\u003eDesign\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003c!--StartFragment --\u003e\u003cp\u003eA passive filter has no amplification stages. It can therefore only be lowered. If one frequency is to be boosted, all the others must be lowered. Behind the filter there is a stage that makes up for the lowered overall level. Since low noise is particularly important here, since up to 20 dB can be made up for, the 120V technology comes into its own.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThe entire passive filter (variable resistor, capacitor and coil) provides a very nice sound characteristic. Besides the choice of components, the charging behaviour of the capacitors and the saturation behaviour of the coils play a major role in this. The resulting relative inertia compared to potentially very fast active filters is the reason for a pleasant, musically advantageous sound characteristic. We would choose smoothness and transparency as well as strikingly silky highs and pithy basses as a description that suits our perception.\u003c\/p\u003e\u003c!--EndFragment --\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003c!--StartFragment --\u003e\u003cp\u003eDuring fine-tuning, through component selection, in countless listening sessions, the emphasis was on achieving the most musical sounding curves possible, which, for example, need fear no comparison with a Pultec EQ from the 1950\/60s. Only without all the disadvantages of a 60 year old original, such as the very high background noise, but above all the very limited frequency selection.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eAnother highlight of the PASSEQ is the HF+ band, which has been extended by the frequencies 25 kHz and 35 kHz and sounds so incredibly good that you don’t want to switch it off.\u003c\/p\u003e\u003c!--EndFragment --\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eThe 120V technology\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eThe 120V technology is our reference technology. The 120V technology is unique in the world. It operates at a DC voltage of 120 volts. This is four times that of IC-based semiconductor op-amps.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/elementor\/thumbs\/imgi_68_Phonitor-se-innen-2048x1368-1-rgc3oajyau9p84s2c5t0qyptqlifmq6gr160l5jj0g.jpg\" title=\"imgi_68_Phonitor-se-innen-2048×1368\" alt=\"imgi_68_Phonitor-se-innen-2048x1368\" loading=\"lazy\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\u003cp\u003eThe highest possible audio quality requires the highest possible audio operating voltage.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eThe 120V technology works with +\/-60 V. To be able to handle such a high voltage, we have developed special proprietary operational amplifiers that can operate with a DC voltage of +\/-60 V: the SPL 120V SUPRA operational amplifiers.\u003c\/p\u003e\u003cp\u003eThis high voltage would destroy conventional components and operational amplifiers.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThe 120V technology achieves exceptional technical specifications and sonic benefits. Technically, in terms of dynamic range, signal-to-noise ratio and headroom. Sonically, in terms of richness of detail and an absolutely relaxed listening experience.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eBy the way, the “120V” in the name of the technology has nothing to do with the local mains voltage from the mains power socket. This is about the operating voltage inside the device with which the audio signals are processed.\u003c\/p\u003e\u003cp\u003eThe mains voltage from the mains power socket is transformed to the required secondary voltage in the device’s internal linear power supply with toroidal transformer. Rectifiers convert this AC voltage into DC voltage required in the audio device.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg width=\"1419\" height=\"798\" src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/2025\/12\/imgi_29_Galaxy-Ref-Mastering-4-1.jpg\" alt=\"imgi_29_Galaxy-Ref-Mastering-4-1\" title=\"imgi_29_Galaxy-Ref-Mastering-4-1\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\u003cp\u003eThe idea for SPL 120V technology and the SUPRA operational amplifier based on this technology were developed in the 1990s by SPL founder and chief developer Wolfgang Neumann.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eWith the goal of building the best mastering console ever, this basic technological philosophy then took shape for the first time – thus the SPL MMC1 Mastering Console for Galaxy Studios saw the light of day in 2000.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eThe outstanding sonic and technical features quickly got around in the scene – so further orders were not long in coming.\u003c\/p\u003e\u003cp\u003eBesides the MMC 1, another legendary product with 120V technology was created with the PQ, the “King of Parametric Equalizers”.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg width=\"1000\" height=\"563\" src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/2025\/12\/imgi_30_Wisseloord-Studios-2014_-787.jpg\" alt=\"imgi_30_Wisseloord-Studios-2014_-787\" title=\"imgi_30_Wisseloord-Studios-2014_-787\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg width=\"1024\" height=\"509\" src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/2025\/12\/imgi_31_wisseloord_1500-pq-1024x509-1.jpg\" alt=\"imgi_31_wisseloord_1500-pq-1024x509\" title=\"imgi_31_wisseloord_1500-pq-1024x509\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\u003c!--StartFragment --\u003e\u003cp\u003eSince that time, 120V technology has been the foundation for all SPL premium products. Meanwhile, not only for mastering applications, but also for the, studio or hifi use.\u003c\/p\u003e\u003c!--EndFragment --\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--StartFragment --\u003eComparison\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003c!--StartFragment --\u003e\u003cp\u003eMost audio devices work with an internal operating voltage of +\/-15 volts and can thus process a maximum input level of +21.5 dBu. If a DAC, for example, has an output level of +22 dBu at 0 dBFS, level peaks of the music material would already cause overloads in the input stage of the device.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eAll components in the audio device often operate at their limits. The result is an unsteady sound that causes stress and faster ear fatigue.\u003c\/p\u003e\u003c!--EndFragment --\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003c!--StartFragment --\u003e\u003cp\u003eSPL devices with 120V technology can handle input levels of +32.5 dBu thanks to the higher internal operating voltage of +\/- 60 volts – thus offering 12 dB more headroom. All components consequently operate continuously in the optimum operating range. The result is a very pleasant, natural and relaxed sound experience. So you can enjoy your music in every detail.\u003c\/p\u003e\u003c!--EndFragment --\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003eThese diagrams clearly show the superiority of the 120V technology in comparison to other circuits with lower, common operating voltages.\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg width=\"501\" height=\"561\" src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/2025\/12\/imgi_33_120V-Diagramm_Dynamikumfang-Farbe_EN.png\" alt=\"imgi_33_120V-Diagramm_Dynamikumfang-Farbe_EN\" title=\"imgi_33_120V-Diagramm_Dynamikumfang-Farbe_EN\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg width=\"497\" height=\"536\" src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/2025\/12\/imgi_34_120V-Diagramm_MaximalpegelFarbe_EN.png\" alt=\"imgi_34_120V-Diagramm_MaximalpegelFarbe_EN\" title=\"imgi_34_120V-Diagramm_MaximalpegelFarbe_EN\"\u003e\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\u003cimg width=\"938\" height=\"1024\" src=\"https:\/\/suhavimart.com\/wp-content\/uploads\/2025\/12\/imgi_35_120V-Diagramm_THD_NFarbe_EN-938x1024-1.png\" alt=\"imgi_35_120V-Diagramm_THD_NFarbe_EN-938x1024\" title=\"imgi_35_120V-Diagramm_THD_NFarbe_EN-938x1024\"\u003e","brand":"Sur Sargam","offers":[{"title":"Default Title","offer_id":52663878910249,"sku":null,"price":438990.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0682\/0750\/9801\/files\/SPL-Audio-Passeq-Passeq-Passive-Equalizer-2.webp?v=1770878551","url":"https:\/\/sursargam.com\/products\/spl-audio-passeq-passeq-passive-equalizer","provider":"Sur Sargam","version":"1.0","type":"link"}