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AV8 DRIVER The first FULLY CUSTOM driver we ever offered, The AV8 is an 8" SHIELDED midwoofer, designed for use as a smaller subwoofer, the woofer in a three way system, or the midwoofer in a two way. It really is that flexible! If you need to find a midwoofer with serious bass output that can be placed within a few inches of a TV or computer monitor, and won't break the budget, well look no further. This is the driver for you! |
| Parameter | Value | Parameter | Value |
| Fs | 35.8 Hz | Le | 1.15 mH |
| Re | 5.48 ohms | Zmax | 75.3 ohms |
| Qts | 0.39 | Qes | .43 |
| Vas | 51.8 litres | Qms | 4.19 |
| Xmax | 6 mm | Mmd | 26.5 grams |
| EBP | 83.3 | Mms | 28.5 grams |
| SPL | 89.3 dB @ 1W/1m | Cms | 0.6934 mm/N |
| VC Length | 19 mm | Rms | 1.53 N*sec/m |
| Gap Height | 7.9 mm | BL | 9.06 N/A |
| VC Diam. | 38.1 mm | No | 0.54% |
| Sd | 231 cm^2 | Magnet Mass | 934 grams |
| Power rating | 100W RMS pink noise NOTE: Power rating is thermal only! It is NOT a power requirement; typically you get full output with significantly less power than the rating. |
Driver construction? Much better than you would expect
for the price. Rubber positive half-roll surround. Progressive
cloth spider. Kapton voice coil former.
Thick treated paper pulp cone. Pressed paper former cap. Very thick
stamped steel basket. 8 mounting holes. Steel shielding cup.
Vented pole piece
(shielding cup is vented in the rear). Solder/tab terminals. Braided
leader wire. Voice coil wire is round copper, in case you wanted to know
that, too...
Oh yeah, about that flange - the driver is 210 mm / 8.25"
in diameter, with a 178 mm / 7" cutout. That leaves a full 16
mm / 0.625" wide flange, with the
mounting holes at the EXTREME outside edge. Talk about ease of mounting
- no worry about having a measly 3 mm / 0.125" between the screw and driver
hole!
With a full 12.7 mm / 0.5" from screw/bolt center to driver cutout, T-nuts
clear with NO problems... Compare that to some of the more "esoteric"
drivers out there,
where you're lucky to get 9 mm / 0.375" flange widths, and HALF that from
screw/bolt center to driver cutout.
Drivers should not only sound good, they should be easy to use.
As this driver is in production, things are pretty stable, as
far as design specs go. However, since we're always tinkering, trying
to make things better, we reserve
the right to change specs as we see fit, when we see fit. Or for
the lawyers out there, all specifications (yes, including the cost..:) are subject
to change without notice.
SUGGESTED ALIGNMENTS
| Alignment | Details |
| SBB4 | 37.3 liters, tuned with a 2"D by
4"L vent F3 = 35.8 Hz |
| EBS | 53.5 liters, tuned with a 2"D by
3.375"L vent F3 = 30 Hz |
| Adire Alignment | 28 liters, tuned with a 2"D by
6.5"L vent F3 = 41 Hz |
| 4th order bandpass | 17 liters sealed/14 liters tuned with 2"D by 2"L vent, F3 = 41Hz low end /120 Hz high end |
| Q = 0.707 | 20 liters sealed, stuffed with 12 ounces
polyfill F3 = 64.3 Hz |
| Q = 0.577 | 38 liters sealed, stuffed with 24 ounces
polyfill F3 = 67 Hz |
As you can see, this driver is suited to many possible uses,
ranging from less than half a cubic foot on up. Small sealed boxes, vented
systems, bandpass
configurations, even TLs can be successfully built using this driver.
Well, the low end is definitely tempting. But how about
the high end? How about a graph of the frequency response? OK, here
you go...
Frequency response, measured on-axis at 1 meter, is:
Note the expanded scale on the left: 6 dB
per division, with a range of 6 dB to -24 dB. Frequency response
was smoothed 1/6th octave - not 1/3rd as is typical.
We're not ashamed of this driver!
As you can see, response is relatively flat
up to 2.2 kHz, where there is a 3 dB peak over the octave below.
Overall, anechoic response fits into a nice ±3 dB window from about 50 Hz to
2.7 kHz - definitely capable of use as a midwoofer in a two way!
And since the mild break-up occurs at 2.2
kHz, which because of lobing considerations you should consider as the upper
limit of useable bandwidth,
it's a natural for dealing with the crossover - no special compensation network
is really needed. In fact, we've got a 6th order acoustical solution that
fits from Fc (determined from your box alignment) to 2.4 kHz, ±2.8 dB, with
one capacitor, one inductor, and one resistor. No Zobel, no special equalization.
One cap, one coil, one resistor. That's it!