D7 Ref. Monitor

Price: $1,199.00

2 item(s)


Speaker Type Satellite
Range Covered  65hz-35khz
Woofers 1
Tweeter 1
Dimensions (DxWxH) 9x12x7.75
Weight (lbs) 16

Not Available


Perfect Studio Monitor

This is our replacement for the "Short Satellite". With much lower distortion and improved cabinet design/bracing, this ultra-accurate monitor should be used if you are going to be listening to a lot of Music as well as watching Movies.

With the D7 we built on the inherent strengths of the small two-way monitor by reducing coloration from several sources. Like peeling an onion, reducing one source of coloration many times reveals others that had been previously unnoticed. The end result of reduced coloration is a more enjoyable, believable listening experience; more like listening to music than loudspeakers, or the boxes they are housed in.

1) Enclosure vibration: When a loudspeaker’s enclosure is free from vibration, it allows the speakers to just “disappear” leaving a sonic image spread between the speakers without any lingering resonance modes to draw the listener’s attention toward the transducers themselves. Small two-way monitors with their small cabinets tend to have much lower levels of panel vibration and midrange coloration than floor standing loudspeakers. However, placing ones ear to the top or side surfaces of even small box speakers and it’s obvious that the box’s panels generate considerable, resonant midbass and mid-range output. Thru extensive analysis and prototyping, we developed a cabinet bracing and damping scheme that reduces the D7 cabinet vibrations by more then 10dB throughout the bass and midrange. By placing an ear to the D7 cabinet you will hear the difference. Instead of the typical harsh resonant box output, only muffled, muted sounds remain.

2) Low frequency bass alignment: Most small two-way loudspeakers take advantage of a ported enclosure’s ability to extend the low frequency response. This can give the impression of a fuller sound, but at the expense of colored, under damped response to transients. A sealed enclosure with a system Qtc = 0.7 was chosen for the D7. This provides solid, well damped bass response with a more gradual 12dB/oct roll-off. In our experience this also facilitates seamless integration with a subwoofer if desired.

3) Woofer basket-magnet resonance: Every woofer when mounted in a cabinet by screws around the basket edge has an inherent basket-magnet resonance mode. The magnet is the mass, the basket the restraining stiffness. This resonance is excited by the action of the voice coil pushing against the flux in the magnetic gap. With little to no damping, the resonance can linger for several seconds once excited. This resonant energy is mechanically coupled directly to the box and radiated from all the enclosure panels. In fact, many times what is thought to be a major panel vibration mode is actually the woofer basket-magnet resonance radiated by the panel. Typical woofers with stamped steel baskets have this resonance mode in the 200-300 Hz range; right where it can easily excite the enclosure. The new woofer we selected has an extremely stiff cast basket that pushes this resonance mode up to 800-900 Hz where it is more easily damped and less prone to exciting enclosure vibration.

4) Woofer cone break up: The only way to avoid coloration from the woofer cone break up modes is to make the cone stiff enough so that the first break up mode is well above the crossover frequency. The lightweight anodized aluminum cone of the D7 has its first break up mode 2 octaves above the crossover frequency. With the 4th order Linkwitz Riley crossover used, the cone break up modes are attenuated more than 30dB below the tweeter reference level. We added a notch filter to push the cone break up response peaks down another 12dB into the noise floor.

5) Room response: Every audiophile knows that the listening room can have a dramatic affect on how a loudspeaker sounds. This is because our ears hear not only the on-axis first arrival output from the loudspeaker, but also the total acoustic output from the loudspeaker in to the room. Experience has taught as that smooth, uniform off axis response leads to speakers that are more forgiving of their surrounding. For this reason, the D7 crossover was developed to optimize both on and off axis response.


6522 Midway Rd. Haltom City, TX 76117   -   682-231-2099   -     HOURS (Monday-Friday 11-6) (Saturday 11-3)