Geoff, It will be a published design. Don't know about in kit form, but definitely in published design form... Adding the mid really won't lower the impedance, if high impedance is desired. A crossover works by raising the impedance of the network + drivers so that less power is delivered...
Yes they are. All the new kits are voiced to sound as close to each other as possible. FWIW, we're getting our trio of LCRs finished today, so the demo room will be bumping! Think it's time for a movie in the warehouse...;) Dan Wiggins Adire Audio
Chris, The crossover is getting finished up right now. Also, what is NOT shown in the picture is the full-range WR125S in the rear for ambience. It's a big speaker (48" tall), but definitely has impact! Dan Wiggins Adire Audio
I'm sure I don't know what you are implying about an WMTMWWW... About the impedance... Here's the impedance of the KIT261 design (an MMT with the woofers wired in parallel): It has a minimum of 5.2 Ohms, and averages ~7 Ohms over the bandwidth of the woofers (from 2.4 kHz and...
I usually don't worry about chamfers or roundovers. IMHO, until they're quite large (on the order of 1-2" or more) you really don't gain much. The dispersion of a tweeter at 13-14 kHz - where a 3/4" chamfer would start to be effective - is already starting to narrow, so you have very little...
Eat the phase in the crossover. Crossovers have a delay inherent inside them - when adjusting the crossover for a flat summation, you are essentially adjusting the phase - the delay. It's not uncommon to have 2" of difference at 2.5 kHz between the woofer and the tweeter... Dan Wiggins...
Graham, Oh, I wasn't blaming Jon! There's a few others out there, though, that seem to want to read more into the data than what's being shown. As I've said many times before, making the perfect anything is art; making the perfect set of compromises is engineering. ALL drivers have...
I'd point out my post: http://www.madisound.com/cgi-bin/dis...gi?read=336899 Note that Dennis' measurements and our measurements are VERY close. The divergence down below 1 kHz is really from baffle step - our measurement in an infinite baffle, his in a baffle. And note that the scale is...
Rob, Had no problem with a higher crossover point - I'm not sure using nearfield measurements is really valid as a way to determine the highest usable frequency response for the speaker anyway. We've had no problems with XO points from 600 Hz to 3 kHz (about all the higher I go, based on...
Seth, Yes, you should design around the actual delay as measured. A baffle is fine, as long as you can discriminate the leading edge of each driver cleanly (sometimes not too easy to do just on a baffle). The acoustic centers are the effective "source" for the driver. It is not an easily...
Seth, We went with layout 2 for the KIT261 designs. Properly implemented, it's not that bad, really. If you pay attention to lobing, you can point the null you get from the MMT arrangement at the floor, and get quite a smooth vertical response from on-axis to approximately +45 degrees, which...
Ask Mark Seaton what what he thinks...;) Put one of these flat BL, low THD, high excursion drivers in a bass horn and you can have a LOT of fun! Dan Wiggins Adire Audio
John, ALL drivers rely on symmetric fringe fields for performance. Simply extend or shorten the pole as needed. Real easy to do, and a very commonly done thing in overhungs and evenhungs. Those who have been doing driver design for several years do this as a matter-of-fact, checklist item...
Vince, It's a really good performer, about as good as the Hiquphon. And it's video shielded, which is really important to many. Power handling isn't an issue; we've railed on the pair we're showing at CES with hundreds of Watts without a problem. High order crossovers help a LOT in terms...
Few corrections... - XBL^2 motors can have ruler flat BL curves, flatter than any other out there. Look at the BL curve of the Extremis 6.8; we've done other motors with ruler-flat (less than 0.5% variance; basically at the limits of measurement resolution) BL curves. HOWEVER, you can make...
Yep. Two way, 21 liters tuned to 33 Hz with a 2" flared port that is effectively 8.75" long. It uses the Usher 9950C tweeter. 6th order crossover solution at 2.8 kHz, measures out at +/- 1.25 dB from 60 Hz and up. It's approximately 3 dB down at 45 degrees off axis at 12 kHz - a function of the...
Kit designs will be coming quite shortly; the first, a stand mounted MT design, will be shown at CES 2005. A floor-standing MMT will come next, and a full 3 way LCR (laid out like our KIT LCC) will come after that. Dan Wiggins Adire Audio PS: nothing shipped out Friday; we forgot that UPS...
Few things to consider... - Underhung motors require much longer gaps (read: more money) for the same stroke as an XBL^2 driver with the same voice coil length (same Re, Le, and mass). Typically twice as tall of a gap for the same voice coil. - Underhungs are considerably less flux...
Rob, For a monster extension in-room vented Tumult design, look at 6 cubic feet tuned to 14 Hz with a 6" diameter port that is 60 inches long (or an equivalent slot port). It should provide, in a standard IEC room, flat extension to about 12 Hz. Most people end up using Tumults in smaller...
Build a 7 liter box, and use a 1.5" diameter x 4" long port. The boxes we built up for demo measured externally 6" wide, 9" deep, and 12" tall. Built with 1/2" thick MDF (plenty stiff for this cabinet). Centered the driver on the front (vertically and horizontally). Port mounted at the top of...
Rob, What you see is correct; the DPL12 is a monster in terms of low bass extension in mid-sized cabinets. That's what it was designed for (along with dipole use). HOWEVER, in terms of clean output, you'll need about 4 DPL12s to equal a Tumult... Dan Wiggins Adire Audio
Brent, Rated efficiency is meaningless for subwoofers. The box dominates the efficiency of the system down deep. And that 1.5mm difference in one way linear excursion amounts to around 0.4-0.5 dB SPL difference (not an audible or noticable difference). HOWEVER, the DPL12 will play lower...
You won't really lose SPL - you'll lose some extension, but not too much. I'd say give it a shot and see what you think, since it's pretty easy to change the rumble filters on the amp. Dan Wiggins Adire Audio
Bite the bullet and get a pair of Creative Sounds' WR125S 4" units. Drop them in 7 liter boxes tuned with a 1.5" diameter by 4" long port, and enjoy. IMHO, there isn't a better wide-range 4" driver on the market, and I'm not saying that just because I designed it. You'll be VERY hard pressed...