Abd

Vertical standing waves are a phenomenon that occurs in nearly all speaker enclosures. Responsible for uneven, boomy or sucked out bass response, vertical standing waves generated inside tall ﬂoor-standing cabinets are extremely difﬁcult to control. But not for Pioneer. We have developed unique acoustic simulation technology, ABD (Acoustic Balance Drive), which allows us to calculate the inﬂuence of the cabinet’s vertical standing waves on the speaker frequency response, taking into account bass drivers and port locations. Using this software, the port and bass drivers of the EX Series are placed in the best position to cut this inﬂuence to a minimum. This new technology allows the ﬁrst vertical standing wave to be totally canceled and the inﬂuence of the second one to be signiﬁcantly reduced.

The result is precise and dynamic bass with no low midrange coloration.

			Acoustic Balance Drive (ABD)
dB SPL			dB SPL			Canceled Standing Wave
100			100
95			95
90			90
85			85
80			80
75			75
70			70
65			65
60			60
10	100	1000	10000 Hz	10	100	1000	10000 Hz
	General Floor-Standing Speaker				Floor-Standing Speaker with ABD Technology
Axis Frequency Response

ABD

Acoustic Balance Drive (ABD)