{"title":"PSI Audio","description":null,"products":[{"product_id":"psi-audio-avaa-c20-active-velocity-acoustic-absorber-black","title":"PSI Audio AVAA C20 Active Velocity Acoustic Absorber - Black","description":"\u003cp\u003eThe \u003cstrong\u003ePSI Audio AVAA C20 Active Velocity Acoustic Absorber\u003c\/strong\u003e is designed to absorb the standing modes between 15 and 150 Hz in a room. It will do so just like passive absorbers but in a much more efficient way and using up much less space. Each operating AVAA will have the same effect as a hole in the wall much larger than the dimensions of the AVAA (that is 0.2 m2). The exact ratio will depend on the frequency and environment but typically range between 5 and 20.\u003c\/p\u003e\r\n\r\n\u003cp\u003eThe AVAA will affect the impedance of the air and “suck” low frequencies around it.\u003c\/p\u003e\r\n\r\n\u003cp\u003eTherefore the best position to place an AVAA is in the most rigid corners as that is where all room modes will be most present.\u003c\/p\u003e\r\n\r\n\u003cp\u003eIt is important to work on the positioning of loudspeakers and listening, as the AVAA will have little effect on inevitable first reflections.\u003c\/p\u003e\r\n\r\n\u003ch3\u003eHow does it work?\u003c\/h3\u003e\r\n\r\n\u003cp\u003eA microphone will measure the acoustic pressure in front of an acoustic resistance.\u003c\/p\u003e\r\n\r\n\u003cp\u003eThe acoustic resistance is designed to let air through but reducing significantly the pressure.\u003c\/p\u003e\r\n\r\n\u003cp\u003eBehind the acoustic resistance, a transducer membrane is driven to absorb the volume of air going through the acoustic resistance as well as ensuring a specific acoustic impedance in front of this acoustic resistance.\u003c\/p\u003e\r\n\r\n\u003cp\u003eWhen in function, this acoustic impedance in front of the acoustic resistance is significantly lower than in ambient air and therefore acts as a pressure sink.\u003c\/p\u003e\r\n\r\n\u003cp\u003eThe acoustic impedance of the air is affected typically over a radius of 1 to 1.5 m around the AVAA. This explains how the AVAA can be more absorbent that its actual surface of perfect absorber.\u003c\/p\u003e\r\n\r\n\u003cp\u003eIt is designed to absorb frequencies between 15 and 150 Hz and is most effective on room modes that are the result of multiple reflections.\u003c\/p\u003e\r\n\r\n\u003ch3\u003eWhat does the AVAA not do?\u003c\/h3\u003e\r\n\r\n\u003cp\u003eThe AVAA is a solution for room modes below 150 Hz and absorbs low frequencies only. It is therefore not a total solution for acoustically bad rooms. For best results, it needs to be combined with passive absorption in higher frequencies.\u003c\/p\u003e\r\n\r\n\u003cp\u003eThe AVAA will only absorb pressure waves within a radius of 1 to 1.5 m around it in these frequencies. It is therefore not a solution for the first reflections a room might have. Correct positioning of speakers and listening position in the room remains necessary.\u003c\/p\u003e\r\n\r\n\u003ch3\u003eWhat effect will the AVAA have in my room?\u003c\/h3\u003e\r\n\r\n\u003cp\u003eThe AVAA will have the same effect, on frequencies from 15 to 150 Hz, as opening a window about 5 to 20 times the size of the AVAA. This will impact sound in the time, frequency and space dimensions.\u003c\/p\u003e\r\n\r\n\u003cul\u003e\r\n\u003cli\u003eTime: it will significantly reduce reverberation time in these frequencies especially on room modes.\u003c\/li\u003e\r\n\u003cli\u003eFrequency: with more precise and tighter bass, the masking effect of higher frequencies is reduced. Details in higher frequencies also become clearer.\u003c\/li\u003e\r\n\u003cli\u003eSpace: with less indirect sound in the room, the location of the sound is more accurate making the sound image more precise.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\r\n\u003ch3\u003eHow many AVAAs do I need?\u003c\/h3\u003e\r\n\r\n\u003cp\u003eTwo AVAA will have a significant effect in most rooms. Depending on the dimension and type of room as well as the result required, between 2 and 4 AVAAs are necessary for most normal size rooms (20 and 80 m2). 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The tight, accurate, perfectly controlled bass allows hearing all details down to 28 Hz and even down to 24 Hz with our larger model.\u003c\/p\u003e","brand":"PSI Audio","offers":[{"title":"Default Title","offer_id":44450360459367,"sku":"110016","price":4689.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/8848\/5479\/files\/psi-a-sub-225-m_110016_1_5d412505-5655-4f54-8ed2-7de39a56dca0.jpg?v=1787092741"},{"product_id":"psi-sub-a225-m-metal-black-single","title":"PSI SUB A225 M - Metal Black - Single","description":"\u003cp\u003eThe \u003cstrong\u003ePSI Sub Active 225 M\u003c\/strong\u003e is a powerful subwoofer and perfectly fits the A21-M and two units perfectly fit A25-M. It extends the frequency down to 24 Hz. PSI subs are designed and calibrated to seamlessly extend the low-end of any PSI loudspeakers and with and overall flat frequency and phase response. 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