{"id":14375,"date":"2026-06-15T09:16:24","date_gmt":"2026-06-15T06:16:24","guid":{"rendered":"https:\/\/360space.ru\/sabvufer-v-domashnem-kinoteatre-kak-pravilno-razmestit-2\/"},"modified":"2026-06-15T09:16:24","modified_gmt":"2026-06-15T06:16:24","slug":"sabvufer-v-domashnem-kinoteatre-kak-pravilno-razmestit-2","status":"publish","type":"post","link":"https:\/\/360space.kz\/en\/sabvufer-v-domashnem-kinoteatre-kak-pravilno-razmestit-2\/","title":{"rendered":"Subwoofer in a home theater: how to place it correctly"},"content":{"rendered":"<h1>Subwoofer in a home theater: how to place it correctly<\/h1>\n<div class=\"tldr\"><strong>Briefly:<\/strong> Subwoofer home theater placement determines up to 70% of the bass quality: the same model in different points of the room sounds \u00b115 dB differently. Calculation by impulse response (Dirac function) and 3D scan of the room provides full correlation of measurements with what the viewer hears in the chair.<\/div>\n<p>Correct <strong>home theater subwoofer placement<\/strong> \u2014 it's not a question of \u201cwhere to put the box,\u201d but an engineering task about the distribution of modal pressure in a confined volume. In a typical room of 25\u201340 m\u00b2, 8\u201314 natural modes are formed at frequencies below 120 Hz, and a subwoofer that falls into a standing wave node loses up to 20 dB at the resonant frequency. Subjectively, the viewer hears \u201cflabby bass, no punch\u201d \u2014 although the emitter itself is working normally. Below, we analyze how the installation location is related to the physics of the room and which schemes actually work.<\/p>\n<h2>Why is subwoofer placement more important than the model itself?<\/h2>\n<p>At low frequencies, the wavelength is comparable to the room size: for 40 Hz it is 8.5 meters, for 80 Hz \u2014 4.25 m. The subwoofer does not emit sound \u201cat the viewer\u201d; it excites the entire air volume. Then three effects come into play:<\/p>\n<ul>\n<li><strong>Reinforcement from boundaries.<\/strong> Installation against one wall adds +3 dB, in a corner \u2014 up to +9 dB due to in-phase reflection summation.<\/li>\n<li><strong>Modal nodes and antinodes.<\/strong> In the center of the long side of the room, at the frequency of the first axial mode, the pressure drops to zero \u2014 the viewer at this point will not hear any bass at all.<\/li>\n<li><strong>Group delay.<\/strong> A subwoofer in the far corner relative to the listener adds 15\u201325 ms of delay, and the \u201cimpact\u201d comes after the image on the screen.<\/li>\n<\/ul>\n<p>The standard calculation using the Thiele\u2013Small method (1965, sine signals) describes only the speaker itself in a free field and yields an efficiency of 1.5\u20135%. It does not account for what happens to the wave after it leaves the enclosure. Therefore, professional calculations are based on the impulse response \u2014 Dirac's function \u2014 which shows a full correlation between objective measurements and subjective perception at a specific listening point.<\/p>\n<h2>What placement schemes work in a home theater?<\/h2>\n<p>There are four proven configurations. The choice depends on room geometry, number of seats, and budget.<\/p>\n<h3>1. Single subwoofer in the front quarter<\/h3>\n<p>Basic option. The subwoofer is not placed strictly in the center under the screen (the center is the node of even modes), but is shifted 1\/4 of the room's width from the side wall. The distance from the front wall is 30\u201360 cm. Suitable for rooms up to 25 m\u00b2 with one row of seats.<\/p>\n<h3>2. Two subwoofers diagonally<\/h3>\n<p>One in the front left, the second in the back right (or mirrored). This scheme averages the modal response: the antinodes of one subwoofer fall on the nodes of the other. The unevenness of the frequency response in the listening area is reduced from a typical \u00b112 dB to \u00b14 dB without any electronic correction.<\/p>\n<h3>3. Four subwoofers according to the Tula\u2013Welty scheme<\/h3>\n<p>One in the middle of each wall or in the corners. This is the standard for cinemas with two or three rows of seats. Modal excitation is symmetrical, the frequency response difference between the extreme and central seats is less than 2 dB.<\/p>\n<h3>4. Double stack at the front wall<\/h3>\n<p>Two subwoofers are placed close to each other. This doubles the radiating surface, provides +6 dB sensitivity, and reduces distortion by 3 dB at the same SPL. A good solution for oddly shaped rooms where symmetrical placement is not possible.<\/p>\n<h2>How to find the optimal point without measurements?<\/h2>\n<p>There is a 'sub crawl' technique \u2014 temporary but effective. The subwoofer is placed in the listener's position, a test track with even bass is played, and the listener crawls around the perimeter of the room. The point where the bass sounds most even and dense is the place for the subwoofer, based on the principle of acoustic reciprocity.<\/p>\n<p>The method yields better results than simply installing \u201cwhere it fits,\u201d but it does not replace instrumental calculation. Sub crawl finds a local optimum for loudness but does not control group delay, phase dips at the junction with front speakers (usually 80 Hz), and modal ringing after signal cutoff. For a system costing more than 500,000 rubles, the difference between \u201cacceptable\u201d and \u201ccorrect\u201d justifies the instrumental approach.<\/p>\n<h2>What does calculation based on a 3D scan of the premises provide?<\/h2>\n<p>3D scanning records geometry with an accuracy of 2\u20133 mm: actual dimensions, niches, beams, protrusions, surface materials. A numerical model is built from the scan using the finite element method, and for each possible subwoofer point, the impulse response in the seating area is calculated.<\/p>\n<p>As a result, the client receives a room map with markings: where the subwoofer will provide a flat frequency response of \u00b13 dB in the 20\u2013120 Hz band, where a dip at 55 Hz will appear, where the delay will exceed the Haas threshold. Next, a solution is chosen based on the specific budget: a single point with a compromise or a scheme of two to four subwoofers with symmetry. Without a scan, this is a trial-and-error process with the risk of rebuilding the room twice.<\/p>\n<h2>What errors are most common?<\/h2>\n<ul>\n<li><strong>Subwoofer in a cabinet or niche.<\/strong> Resonator inside a resonator, distortions up to 15% and a dip in output at 40\u201360 Hz.<\/li>\n<li><strong>Rigid connection to the floor.<\/strong> The wooden floor starts to radiate itself, and a hum appears in adjacent rooms. The solution is anti-resonant spikes or a platform on spring supports.<\/li>\n<li><strong>Matching the crossover frequency with the room mode.<\/strong> If the crossover is set to 80 Hz, and the first room mode is 78 Hz, at this frequency you will get either a +10 dB hump or a dip.<\/li>\n<li><strong>Symmetrical pair without phase shift.<\/strong> Two subwoofers against one wall work as one with double the power, without providing an advantage in terms of frequency response uniformity.<\/li>\n<\/ul>\n<section class=\"faq-block\">\n<h2>Frequently asked questions<\/h2>\n<details>\n<summary>Can I place a subwoofer behind the sofa?<\/summary>\n<p>Yes, if the viewer is not sitting flush against the backrest. The distance from the emitter to the head should be at least 1.5 meters, otherwise bass localization appears \u2014 the brain determines the direction, and the effect of \u201cbass coming from the screen\u201d is destroyed.<\/p>\n<\/details>\n<details>\n<summary>Do you need two subwoofers if the room is only 18 m\u00b2?<\/summary>\n<p>In most cases, yes. A small room has a sparser mode grid, and the dips between them are deeper. Two subwoofers in opposite corners average the frequency response more effectively than one subwoofer with auto-correction.<\/p>\n<\/details>\n<details>\n<summary>At what height should the subwoofer be placed?<\/summary>\n<p>For frequencies below 80 Hz, height is not critical \u2013 the wavelength is greater than the ceiling height. But if the crossover is above 100 Hz, the subwoofer should be raised by 30\u201340 cm so that the radiation is not absorbed by carpets and pillows.<\/p>\n<\/details>\n<details>\n<summary>Will electronic correction help if the location is poorly chosen?<\/summary>\n<p>Correction removes peaks but does not restore dips: you cannot add energy at a frequency where it is physically absent. Therefore, correct placement is always primary, and correction is a final adjustment of \u00b13 dB.<\/p>\n<\/details>\n<\/section>\n<div class=\"blog-cta\" style=\"margin:32px 0;padding:24px;background:#0e0e0e;border:1px solid rgba(255,255,255,0.07);border-radius:8px;text-align:center\">\n<p style=\"color:rgba(255,255,255,0.55);margin-bottom:16px\">Need acoustics advice?<\/p>\n<p><a href=\"\/en\/acoustic\/domashnie-kinoteatry\/\" style=\"display:inline-block;padding:10px 20px;background:#2B6EFF;color:#fff;text-decoration:none;border-radius:4px;margin:4px;font-weight:600\">Read more \u2192<\/a><a href=\"\/en\/acoustic\/#contact\" style=\"display:inline-block;padding:10px 20px;background:transparent;border:1px solid rgba(255,255,255,0.2);color:#fff;text-decoration:none;border-radius:4px;margin:4px\">Consultation<\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>Subwoofer in a home theater: how to place it correctly Briefly: Placement of a home theater subwoofer determines up to 70% of the quality of the bottom: the same model sounds \u00b115 dB differently at different points in the room. Calculation based on the impulse response (Dirac function) and a 3D scan of the room provides a complete correlation of measurements with what the viewer hears in the chair. Correct placement of a home theater subwoofer is not a question of \u201cwhere to put the box,\u201d but an engineering problem about the distribution of modal pressure in a closed volume. In a typical room of 25\u201340 m\u00b2, 8\u201314 eigenmodes are formed at frequencies below 120 Hz, and a subwoofer caught in a standing wave node loses up to 20 dB at the resonant frequency. At the same time, the viewer subjectively hears \u201csluggish bass, no punch\u201d - although the emitter itself is working normally. Below we look at how the installation location is related to the physics of the room and what schemes actually work. Why is the position of the subwoofer more important than the model itself? At low frequencies, the wavelength is comparable to the size of the room: for 40 Hz it is 8.5 meters, for 80 Hz it is 4.25 m. The subwoofer does not radiate sound \u201cto the viewer\u201d; it excites the entire air volume. Then three effects work: Strengthening from borders. Installation near one wall adds +3 dB, in a corner - up to +9 dB due to the addition of reflections in phase. Modal nodes and antinodes. In the center of the long side of the room, at the frequency of the first axial mode, the pressure drops to zero - the viewer at this point will not hear the bass at all. Group delay. A subwoofer in the far corner relative to the listener adds 15\u201325 ms of delay, and the \u201cblow\u201d comes after the picture on the screen. The standard calculation using the Thiel\u2013Small method (1965, sine signals) describes only the speaker itself in a free field and gives an efficiency of 1.5\u20135%. It does not take into account what happens to the wave after it leaves the housing. Therefore, professional calculations are carried out using the impulse response - the Dirac function - which shows the complete correlation of objective measurements and subjective perception at a specific listening point. What layouts work in a home theater? There are four tested configurations. The choice depends on the geometry of the room, the number of chairs and the budget. 1. Single subwoofer in the front quarter Basic option. The subwoofer is not placed strictly in the center under the screen (the center is the node of even modes), but is shifted 1\/4 of the width of the room from the side wall. The distance from the front wall is 30\u201360 cm. Suitable for rooms up to 25 m\u00b2 with one row of chairs. 2. Two subwoofers diagonally, one in front on the left, the second on the back on the right (or mirrored). This scheme averages the modal response: the antinodes of one subwoofer fall on the nodes of another. The frequency response unevenness in the listening area is reduced from typical \u00b112 dB to \u00b14 dB without any electronic correction. 3. Four subwoofers according to the Tula-Welty scheme. One in the middle of each wall or in the corners. This is the standard for cinemas with two or three rows of seats. The modal excitation is symmetrical, the difference in frequency response between the outer and central seats is less than 2 dB. 4. Double stack at the front wall Two subwoofers are placed close to each other. This doubles the radiating surface, gives +6 dB sensitivity and reduces distortion by 3 dB at the same SPL. A good solution for rooms of complex shape, where symmetrical placement is impossible. How to find the optimal point without measurements? There is a \u201csub crawl\u201d technique - temporary, but working. The subwoofer is placed in the viewer's place, a test track with a uniform bass is launched, and the listener walks around the perimeter of the room on all fours. The point where the bass sounds smoothest and tightest is the location for the subwoofer due to the principle of reciprocity of acoustic paths. The method gives a better result than the \u201cwhere it fits\u201d setting, but does not replace instrumental calculation. crawl Sub finds the local volume optimum, but does not control group delay, phase dips at the interface with the front speakers (usually 80 Hz) and modal ringing after the signal is turned off. For a system costing more than 500 thousand rubles, the difference between \u201cacceptable\u201d and \u201ccorrect\u201d justifies the instrumental approach. What does a calculation based on a 3D scan of a room give? 3D scanning records the geometry with an accuracy of 2\u20133 mm: real dimensions, niches, beams, protrusions, surface materials. Based on the scan, a numerical model is built using the finite element method, and for each possible point of the subwoofer the impulse response in the seat area is calculated. At the output, the client receives a map of the room with markings: where the subwoofer will give a flat frequency response of \u00b13 dB in the 20\u2013120 Hz band, where a dip will appear at 55 Hz, where the delay will exceed the Haas threshold. Next, a solution is selected for a specific budget: one point with a compromise or a circuit of two to four subwoofers with symmetry. Without a scan, this is trial-and-error work with the risk of rebuilding the room twice. What errors are most common? Subwoofer in a closet or niche. Resonator inside the resonator, distortion up to 15% and drop-off at 40\u201360 Hz. Rigid connection to the floor. The wooden floor begins to radiate itself, and a hum appears in the neighboring rooms. The solution is anti-resonance spikes or a platform on spring supports. Coincidence of the crossover frequency with the room mode. If the crossover is set to 80 Hz and the first room mode is 78 Hz, there will be either a +10 dB hump or a dip at that frequency. Symmetrical pair without phase shift. Two subwoofers near one wall work as one with double power, without giving any gain in frequency response uniformity. Frequently asked questions Is it possible to place a subwoofer behind the sofa? It is possible if the viewer is not sitting close to the back. The distance from the emitter to the head must be at least 1.5 meters, otherwise bass localization appears - the brain determines the direction, and the \u201cbass comes from the screen\u201d effect is destroyed. Do you need two subwoofers if the room is only 18 m\u00b2? In most cases, yes. A small room has a sparser grid of modes, the gaps between them are deeper. Two subwoofers in opposite corners average the frequency response more effectively than one subwoofer with auto-correction. At what height should I place the subwoofer? For frequencies below 80 Hz, the height is not critical - the wavelength is greater than the height of the ceiling. But if the crossover is above 100 Hz, the subwoofer should be raised 30\u201340 cm so that the radiation is not absorbed by the carpet and pillows. Will electronic correction help if the location is chosen poorly? The correction removes the humps, but does not restore the dips: it is impossible to add energy at a frequency where it physically does not exist. Therefore, correct placement is always primary, and correction is the final setting of \u00b13 dB. Need acoustics advice? Read more \u2192Consultation<\/p>","protected":false},"author":7,"featured_media":14374,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_title":"\u0421\u0430\u0431\u0432\u0443\u0444\u0435\u0440 \u0432 \u0434\u043e\u043c\u0430\u0448\u043d\u0435\u043c \u043a\u0438\u043d\u043e\u0442\u0435\u0430\u0442\u0440\u0435: \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e","_yoast_wpseo_metadesc":"\u0421\u0430\u0431\u0432\u0443\u0444\u0435\u0440 \u0434\u043e\u043c\u0430\u0448\u043d\u0438\u0439 \u043a\u0438\u043d\u043e\u0442\u0435\u0430\u0442\u0440 \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u0435: \u0441\u0445\u0435\u043c\u044b, \u0440\u0430\u0441\u0447\u0451\u0442 \u043f\u043e \u0438\u043c\u043f\u0443\u043b\u044c\u0441\u043d\u043e\u043c\u0443 \u043e\u0442\u043a\u043b\u0438\u043a\u0443, \u043e\u0448\u0438\u0431\u043a\u0438 \u0438 \u0440\u0435\u0448\u0435\u043d\u0438\u044f. \u0411\u0435\u0441\u043f\u043b\u0430\u0442\u043d\u044b\u0439 \u0440\u0430\u0441\u0447\u0451\u0442 \u043e\u0442 360\u00b0 Space Acoustic.","footnotes":""},"categories":[129],"tags":[],"class_list":["post-14375","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-akustika","category-129","description-off"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u0421\u0430\u0431\u0432\u0443\u0444\u0435\u0440 \u0432 \u0434\u043e\u043c\u0430\u0448\u043d\u0435\u043c \u043a\u0438\u043d\u043e\u0442\u0435\u0430\u0442\u0440\u0435: \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e<\/title>\n<meta name=\"description\" content=\"\u0421\u0430\u0431\u0432\u0443\u0444\u0435\u0440 \u0434\u043e\u043c\u0430\u0448\u043d\u0438\u0439 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