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Anyone know anything about Obsidian Audio?
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<blockquote data-quote="Lbetts818" data-source="post: 8583162" data-attributes="member: 665874"><p>ManufactureObsidian Audio</p><p></p><p>Motor TypeOverhung</p><p></p><p>Driver Size18 "</p><p></p><p>Driver Weight30 lbs</p><p></p><p>Coil Diameter2.5 "</p><p></p><p>Coil MaterialCU</p><p></p><p>Coil Length1.575 "</p><p></p><p>Gap Height0.3937 "</p><p></p><p>Manufacture's Xmax20 mm</p><p></p><p>Geometric Xmax15 mm</p><p></p><p>Aprox. Price$190 USD</p><p></p><p>Year2012</p><p></p><p>TS Parameters (Measured by Data-Bass.com)</p><p></p><p>Qts0.532</p><p></p><p>Qes0.67</p><p></p><p>Qms2.58</p><p></p><p>Fs28.9 Hz</p><p></p><p>Res4.1 Ω</p><p></p><p>Le 1khz5.04 mH</p><p></p><p>Sd0.1195 m2</p><p></p><p>Vas151.3 liters</p><p></p><p>Mms399 grams</p><p></p><p>Cms76 μm/N</p><p></p><p>BL21.06 Tm</p><p></p><p>BL2/Res108.2 N2/W</p><p></p><p>L/R Time Constant1.23 milliseconds</p><p></p><p>SplSens89.21 dB</p><p></p><p>Notes</p><p></p><p>This driver was provided by Obsidian Audio and is a new model of low cost bang for the buck 18" driver that will be available for the car-audio or home theater market. The driver itself looks to be well built with the familiar black painted 6 spoke cast aluminum frame providing the skeleton and sporting the ubiquitous rubber mounting gasket. The motor is a modest sized ferrite double stack of 1" thick and 7.2" diameter slugs with a modest top plate and a backplate having a small diameter pole vent. There is a vented aluminum spacer ring between the frame and motor which provides venting under the spiders and extra clearance. The voice coil is a 2.5" diameter copper wind of 40mm length on a black anodized aluminum former and is available in either a dual 2 ohm or dual 4 ohm configuration. The cone is a thick paper pulp that is coated. The spider is a stiff, low compliance 7" diameter unit with stitched in leads, while the surround is a rubber material that is double stitched to the cone with the high roll profile. The xmax rating for this driver is 20mm one way with an xmech near 43mm. All of this sounds like the makings of a decent woofer but when the cost of $190 is considered it seems like a great bargain.rnrnTesting of the parameters in free air after some break in resulted in TSP specs that are reasonably close to those provided by Obsidian. Motor force is decent as is sensitivity which should allow this driver to give good performance in reasonable enclosure sizes. This is always a concern with lower cost drivers where the motor is often the first place skimped on and a weak motor is the result which impacts sensitivity and box requirements. That doesn't appear to be the case here.rnrnBreaking in the driver in free-air with a sine wave near resonance to keep input power down, 25Hz in this case, shows that the Obsidian driver is reasonably noise free through the first 25mm peak to peak with some mechanical chatter starting to creep in from 25-40mm peak to peak. At this point there is significant air movement through the motor. The driver was driven a little past 50mm peak to peak at which point it was making a good amount of clatter but otherwise seemed in no danger of bottoming. The driver is rated at 20mm xmax so it should not be surprising that there is increased noise and distortion when driven past this point. The motor did seem to be running out of steam a little, the suspension is rather tight and the driver did not seem to be responding linearly to further increases in power past about 2" peak to peak so it will probably take quite a bit of power to physically bottom the unit which gives it a good rating for ruggedness and safety margin.rn</p><p></p><p>Copy and pasted in case link is not working. That's for the d2 18 but all I could find.</p></blockquote><p></p>
[QUOTE="Lbetts818, post: 8583162, member: 665874"] ManufactureObsidian Audio Motor TypeOverhung Driver Size18 " Driver Weight30 lbs Coil Diameter2.5 " Coil MaterialCU Coil Length1.575 " Gap Height0.3937 " Manufacture's Xmax20 mm Geometric Xmax15 mm Aprox. Price$190 USD Year2012 TS Parameters (Measured by Data-Bass.com) Qts0.532 Qes0.67 Qms2.58 Fs28.9 Hz Res4.1 Ω Le 1khz5.04 mH Sd0.1195 m2 Vas151.3 liters Mms399 grams Cms76 μm/N BL21.06 Tm BL2/Res108.2 N2/W L/R Time Constant1.23 milliseconds SplSens89.21 dB Notes This driver was provided by Obsidian Audio and is a new model of low cost bang for the buck 18" driver that will be available for the car-audio or home theater market. The driver itself looks to be well built with the familiar black painted 6 spoke cast aluminum frame providing the skeleton and sporting the ubiquitous rubber mounting gasket. The motor is a modest sized ferrite double stack of 1" thick and 7.2" diameter slugs with a modest top plate and a backplate having a small diameter pole vent. There is a vented aluminum spacer ring between the frame and motor which provides venting under the spiders and extra clearance. The voice coil is a 2.5" diameter copper wind of 40mm length on a black anodized aluminum former and is available in either a dual 2 ohm or dual 4 ohm configuration. The cone is a thick paper pulp that is coated. The spider is a stiff, low compliance 7" diameter unit with stitched in leads, while the surround is a rubber material that is double stitched to the cone with the high roll profile. The xmax rating for this driver is 20mm one way with an xmech near 43mm. All of this sounds like the makings of a decent woofer but when the cost of $190 is considered it seems like a great bargain.rnrnTesting of the parameters in free air after some break in resulted in TSP specs that are reasonably close to those provided by Obsidian. Motor force is decent as is sensitivity which should allow this driver to give good performance in reasonable enclosure sizes. This is always a concern with lower cost drivers where the motor is often the first place skimped on and a weak motor is the result which impacts sensitivity and box requirements. That doesn't appear to be the case here.rnrnBreaking in the driver in free-air with a sine wave near resonance to keep input power down, 25Hz in this case, shows that the Obsidian driver is reasonably noise free through the first 25mm peak to peak with some mechanical chatter starting to creep in from 25-40mm peak to peak. At this point there is significant air movement through the motor. The driver was driven a little past 50mm peak to peak at which point it was making a good amount of clatter but otherwise seemed in no danger of bottoming. The driver is rated at 20mm xmax so it should not be surprising that there is increased noise and distortion when driven past this point. The motor did seem to be running out of steam a little, the suspension is rather tight and the driver did not seem to be responding linearly to further increases in power past about 2" peak to peak so it will probably take quite a bit of power to physically bottom the unit which gives it a good rating for ruggedness and safety margin.rn Copy and pasted in case link is not working. That's for the d2 18 but all I could find. [/QUOTE]
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