Quad ESL 2905

The area converter fans praise the transparency and accuracy of their honey. Scores also the quad with these advantages?

  1. Quad ESL 2905
  2. Data sheet

As the fans of Martin Logan, Magnepan, and final, quad enthusiasts hold high the flag of faces converter. The membrane has almost no mass, there is not a closed case, and by the way it’s in the quads even wide strips. So far the lofty theory – the hard practice makes it for the developers truly complicated. The lightweight foil is difficult to drive, the open construction leads to the extinction of the bass frequencies the large membrane to undesirable strong effects of bundling.

Peter Walker, spiritual father of the Quad electrostatic has ready for all these difficulties the right solution. Not magnetic force, but a 5000 Volt strong electric field prompts the foil in the ESL 2905; the area is almost one square meter. Against the directional effect, the membrane is divided into circular areas for different frequencies. The higher the tones, the smaller the vibrating part of the slide, the angle remains constant through the own bundling in the important midrange. The Division has also the advantage that deep tones get more levels, which again resembles the acoustic short-circuit to the pages. Because a dipole Spotlight which emits virtually no sound to the page back but just as much as forward of 2905.

Problem solver

The Quad, regarding the placement recommendation and also the combination with the room acoustics gives a special status: they should not be closer than two metres to the rear wall. Similarly, the acoustic nature behind two electrostatic must be as far as possible identical: one against a window and the other in a passageway radiates the stereo balance and the representation of the stage suffering massively. No problem – and problem-solver – are the quads in the bass: the dipole radiation hardly encourages the room resonances, the bass should remain dry and tight, where other boxes already sign ROAR danger.

Quietly listening test

After a few bars, it was clear: high levels are not the profession of the Quad. Who before the dynamic possibilities of focal Electra or even the JBL Everest has plumbed is the protection circuit of the ESL 2905 acquaintance quickly. We need to engage on the quiet tones of the electrostatic.

In comparison, the revel Performa in the deep bass could not conceal their reflex voting: minimal heard swing to the lowest notes of the double-bass on “Play Bach”, where the Quad dynamically somewhat slowed, but completely dry and pulse just acted. By the way, to a lot deeper than its little sister, the ESL 2805. Although the 2905 6 Symphony (Levi, Telarc) could point not all musicians in Mahler’s exactly to their places, a hearing by the polyphonic structures managed transparently and in the truest sense of the word trouble going on. Already opulent space of recording was provided additional depth, but less height and width than about the Revel -, the two heating panels were accurately placed. In Verdi’s “La Traviata” (Mehta, Farao) listeners got served the quintessence of the comparison: about the revel it sounded somewhat theatrical, more creamy and articulation in the votes. The quad in turn projected the tragic love story free by hiss, in the heights of somewhat timidly, very intimate and transparent in the AUDIO listening room.


For the Quad, you should take time – and especially quietly listening. Then, one discovers their discreet, infinitely transparent and spatial game way. And their ability to avoid spatial bass problems English elegant.

Quad ESL2905

Manufacturer Quad
Price €9500.00
Rating 95.0 points
Test procedure 1.0

Technical data and test results

General data
Dimensions (W x H x D)
Technical characteristics
Bass principle
Number of ways
Working principle of full Active
XLR connectors
Space adaptation
Surround complementary.
Laboratory characteristics
Maximum volume upper value
lower cut-off frequency (-3dB)
Lower cut-off frequency (-6 dB)
Nominal impedance (audio)
very homogeneous and transparent, dry bass and deep space
Maximum level could be very limited, location more precisely
Bass quality 95
Bass depth (bass Foundation) 85
Attention to detail (precision) 110
Dynamic 100
Maximum level (vitality) 50
Neutrality 95
Imaging 95
Spatial (airiness) 115
Processing Very good
Sound judgment well over 95
tested in issue: 4 / 07