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Product News
2020/04/02
The Sound of PMC – what is ATL?
ATL™ bass-loading technology offers the following advantages over traditional ported and sealed monitors: 
• Exceptional LF extension with no colouration
• Identical tonal balance at all levels
• Higher SPLs without compression or listener fatigue 
• More efficient
• A truly accurate response that translates 

 
PMC’s unique ATLTM (Advanced Transmission Line) enclosures have taken sonic performance to the highest level, using sophisticated cabinet construction, proprietary drive units, and patented absorption materials and techniques. The benefits are enormous compared to sealed-box and ported designs. 
 
PMC’s innovative approach places the bass driver near one end of a long tunnel (the Advanced Transmission Line), which is heavily damped with acoustic material carefully specified to absorb the upper bass and higher frequencies radiating from the rear of the bass driver. The lowest frequencies are allowed to pass down the line and emerge from the front vent in the same polarity as the bass unit’s output, so that the vent acts like a second LF driver. 
 
An important benefit of the ATLTM approach is that the air pressure inside the cabinet, which loads the bass driver, remains consistent. This helps to maintain control of the driver over a wide frequency range and significantly reduces LF distortion. Consequently, the upper bass and mid-range detail is not masked by harmonic distortion and the result is PMC’s characteristically transparent mid-range, fast, attacking bass, and outstanding clarity. When compared to ported or sealed designs of the same size, even ones with similar drivers, ATLTM speakers offer extended bass performance, and a higher maximum SPL. 
 
The very consistent bass driver loading also means that the frequency response stays the same whatever the output level. With PMC’s ATLTM speakers, critical listening can be conducted at very low volumes if required, preserving everybody’s hearing when they need it most.