Snell has acknowledged the design constraints faced by many system designers and enthusiasts by creating a triple-pronged approach to their line. With this approach, each speaker series will have an in-room, in-cabinet and an "invisible" in-wall version. These speakers will have similar capabilities and also be voiced to match each other, so that they can be mixed within a system as the room environment may dictate. The IW-B7s reviewed here were designed as the in-wall version of Snell's B7 Reference Tower. The IC-B7 is the in-cabinet version. While the $5,000 per speaker price tag may shock some, the IW-B7 is a serious, reference-grade speaker that has been engineered to work within the confines of an in-wall installation.
The IW-B7s, like the rest of the B7 line, were designed by Snell's new chief engineer, Dr. Joseph D'Appolito. Not surprisingly, all of the speakers in the line incorporate a D'Appolito array. The term "D'Appolito array" is often used to describe just about any midrange/tweeter/midrange ("MTM") array, but it is improper to do so. A true D'Appolito array, as used in the B7 line, refers not only to the MTM configuration of the drivers, but also to the spacing between the drivers and the configuration of the crossover circuits. A proper D'Appolito array will utilize in-phase crossovers and driver spacing to produce a sound wave that has carefully focused vertical dispersion characteristics to minimize problems associated with floor and ceiling reflections.
The configuration and specifications of the IW-B7 read like those of a midsized tower speaker, which is not surprising, given that this is the in-wall version of a reference tower design. The IW-B7 is a large in-wall speaker, measuring 42 inches high, 14 inches wide and three-and-a-quarter inches deep, which means that they will fit into a standard stud bay (16 on center), the standard for interior wall in residential construction in most areas. The driver configuration features an eight-inch polymer cone woofer on each end, with a four-and-a-half-inch magnesium cone, Hexadym magnet midrange drivers flanking a single one-inch Sonotex dome and a Hexadym magnet tweeter in the center. The drivers are all made by Seas to Snell's specifications. For example, the midrange has a modified voice coil to improve performance within certain parameters and the tweeter's back cavity has been modified to lower resonance. The MTM array is on its own sub baffle that can be rotated to maintain vertical alignment, even if the speaker itself is mounted horizontally. The baffle is constructed out of two quarter-inch layers of MDF that sandwich a layer of "Noisekiller," a sound-damping material sourced from Saab. The cabinet is made from heavy-gauge aircraft-grade aluminum, reinforced and damped with Dynamat and fiberglass. Small toggle switches allow for adjustment of treble level and boundary equalization. A perforated white metal grille hides the entire front panel. The grille and flange can be ordered in custom colors or painted by the installer to match the wall. Performance specifications for the IW-B7 are stated as follows: a frequency response of 63Hz to 22 kHz, sensitivity of 90dB, a nominal impedance of six ohms and maximum output of 111 dB.
Snell provided an in-wall "subwoofer," the IW-Basis300 to be used with the IW-B7 main speakers. This $1,250 speaker is a passive design with a single ten-inch woofer. The four-and-a-half-foot-tall enclosure is made out of an unspecified type of wood and is sized to fit within a standard two-by-four stud bay, which is the standard for residential construction of interior walls. After installation, and the required drywall repair for retrofit installations, all that will be visible is an approximately 14-inch-square grille that mounts flush to the wall and can be painted to match. The single ten-inch driver is a long-throw shallow cone design with a heavy cast metal basket for rigidity. The enclosure is a vented design, with two small square vents located to each side of the top portion of the driver. This location allows the vents to fire through the grille without enlarging it.
In order to approximate the performance of the speakers as they would sound in a permanent installation, I spoke with Snell's Bob Graffy and Joe D'Appolito. This resulted in me placing the IW-B7s on eighteen-inch-high stands positioned on the front wall of my listening room. The speakers were set on top of the stands and leaned slightly back against the wall, with a piece of medium density foam rubber at the contact point. I then used cardboard to make improvised baffles that would simulate the speakers being installed flush with the wall surface. The speakers were placed just over eight feet apart to flank my SMX Screen's 110-inch 16:9 screen. Ideally, I would have placed them a little closer together. Speaker wire connections were made by spring-loaded connectors. Unlike the spring-loaded connectors found on the backs of lower-end receivers, these connectors were robust and kept a firm grip on my Kimber speaker cables. Lastly, small toggle switches on the front baffle provided adjustment for tweeter level and boundary compensation. The IW-Basis300 took a bit more effort to set up. The speaker wire needs to be feed through grommets in the end of the cabinet and then sealed. The actual electrical connection is made at the driver, which requires that the driver be removed. While this sounds like extra effort, I would suspect that most installers would want the driver removed from the cabinet during installation to protect it from inadvertent damage.
I used the Snells solely in my dedicated two-channel system, utilizing Logitech's Transporter and Classe CDP-202 as sources, a Conrad Johnson CT5 preamplifier and Halcro DM-38 amplifier. For this review, Snell sent me their SPA-750 subwoofer amplifier, which was connected to the second output of my Conrad Johnson preamplifier to drive the IS-Basis300. The SPA-750 is a single-channel 750-watt amplifier with crossover, phase and level controls. The SPA-750 also contains a single band parametric equalizer. All line level connections were Kimber Select and speaker cables were Kimber's 8TC for the IW-B7s and their KWIK 12, which is UL rated for in-wall use for the IW-Basis300.
I began my listening with just the IW-B7s without the IW-Basis300. I let the speakers break in for a week or so, using my Transporter playing random tracks of my music collection. I was walking past the room the speakers were in and heard Dire Straits' Brothers in Arms (Warner Brothers) playing. I went in and sat down for a closer listen, selecting the track "Money for Nothing". I ripped this album to my NAS in FLAC to maintain sound quality. Listening to the well-known guitar riff that opens this song, I quickly learned that these speakers are very dynamic with a lush, vibrant midrange. I was particularly impressed that the sound floated off of and along the width of my front wall, rather than directly from the speakers themselves. The guitars maintained an aggressive edge, with good detail throughout their range. The drums on this album have never been fantastic, but the Snells did them justice. However, as the notes dropped below the 60 Hz or so range, they gently rolled off. "Your Latest Trick" has a triangle that seemed to be a bit more piercing through the Snells, indicative of a tipped up treble. I adjusted the treble control to cut the high end a bit, which seemed to even things out. While I found the treble in the flat position to be a bit forward, my listening position was pretty much dead-on center of the vertical dispersion of the speaker. If you are sitting slightly above or below the center of the vertical axis, this may not be necessary.