the px story using the 310px

Transcription

1

2 the px story Your 310px component subwoofer is the finest subwoofer ever from a/d/s/. Like other models in the px system, the 310px sets a new standard of musical performance and precise construction. The philosophy behind px is to build products which are not compromised in any way by price constraints or manufacturing simplicity. With all px series products, musical performance takes precedence over all other considerations. Each design choice made during the engineering process was made to provide optimum performance not attainable with conventional materials and construction. In the 310px, this philosophy results in a precisely machined frame of Aluminum, Brass, and Stainless Steel. This frame is hand assembled to precise tolerances, assuring perfect alignment of all of the moving parts. Additionally, the magnet and voice coil assembly are of an "underhung" design, which dramatically improves linearity and results in much lower harmonic distortion than with conventional woofers. The anodized aluminum cone and voice coil help dissipate heat from the motor structure, thereby improving power handling and reducing dynamic compression of the signal. These improvements add up to make the 310px the most musically accurate low frequency driver we have ever produced. using the 310px The 310px was carefully engineered for optimum use installed in a small sealed enclosure in a typical automotive environment. The parameters were chosen to yield a gentle low frequency rolloff, which combines with the typical vehicle transfer function to give extended low frequency performance with excellent transient response. The optimum recommendations are given in the specifications section of this manual. The 310px may also be used in single-tuned bandpass or vented enclosures if different results are desired, or if the application demands it. Using the 310px in a vented enclosure will typically give you higher SPL capability than in a sealed enclosure, but with the penalty of additional group delay and compromised transient response. Due to the effects of the vehicle's transfer function, a typical vented enclosure will give you a slight bass emphasis above the enclosures cutoff frequency, with a sharp rolloff below it. Most practical bandpass enclosures will also share this characteristic, with the added disadvantage of signal compression and wind noise through the port at high SPL. However, the vented option may be appropriate if you value SPL above audiophile sound quality. A bandpass enclosure can sometimes be the best choice if the bass must pass through a small panel, since you only need enough panel space to pass the port through. 2

3 While the 310px is very rugged in use, some aspects of its design require careful handling during installation. In particular, the voice coil is vented below the spider. This improves power handling and linearity, but it also provides a path for particles to become lodged in the voice coil. warnings and tips Keep the 310px in its protective plastic bag until you are ready to install it. Keep the unit away from sawdust and metal shavings. Thoroughly vacuum the inside of the enclosure before installing the woofer to remove any sawdust or wood shavings. If using fiberglass or polyester filling in the enclosure, completely cover the rear of the driver with a piece of cloth between the driver and the filling. Do not use wood screws to mount the woofer to the cabinet. Use "T"-nuts and machine screws only. Do not press the dustcap! This will cause permanent deformation. Be careful handling the speaker frame to avoid scratching the cosmetic surface. The 310px is unusually heavy and has very high capability. It demands above average enclosure construction to perform at its best. We recommend that you construct the enclosure from MDF or laminated Baltic birch plywood at least 3/4" (20mm) thick. Whenever possible, 1" (25mm) thick material is preferred. Due to the unusual beauty of the 310px frame, you may want to show it off with one or more panels made from clear acrylic. All acrylic panels should be at least 1" thick. Use "T"-nuts and machine screws to fasten the 310px to the enclosure. enclosure construction Make certain all of the joints and panels in the enclosure are airtight and rattle-free. Seal any terminals or wire access holes completely. Seal the driver's mounting surface with foam tape. Some applications may demand a different solution than the above recommendations allow. For example, you may need to construct an enclosure from Fiberglass, Kevlar, or Carbon Fiber in order to fit into an irregularly shaped cavity. When using these materials, try to keep any unsupported flat wall surfaces to a minimum. Add bracing whenever necessary to keep the enclosure walls from flexing under pressure. 3

4 damping material Enclosure recommendations are given for enclosures with and without damping material as a filler. Use of filler will yield the smallest enclosure size. If you are building with transparent panels, you will probably not want to use any filler material, so use the "no-filler" enclosure recommendations. For sealed enclosures, or the sealed portion of a bandpass enclosure, the design recommendations assume fiberglass or polyester damping material installed at a density of 12oz. per cubic foot. It is VERY IMPORTANT that you place a piece of reasonably finetextured cloth between the back of the driver and the filler material. A piece of grill cloth will work. This will prevent any of the fibers from the filler material from becoming lodged in the voice coil. All vented enclosures, sealed enclosures with transparent sides, and the vented chambers of bandpass enclosures should have all non-transparent cabinet walls lined with 1" thick foam damping material. wiring The terminals used on the 310px will accept up to AWG#8 speaker cable. We recommend using AWG #12 OFC copper wire to connect the 310px to the amplifier. For the best contact: Do not tin the wire before inserting it into the terminal. Do not use any pins or other terminations. Do strip the wire approximately 1/2" and insert it into the terminal. The wire will conform to the inside of the terminal to provide the best contact surface. 4

5 The 310px is a dual voice-coil design. This allows great flexibility in system wiring, depending on the number of woofers used and the capability of the amplifier. For the highest fidelity with the a/d/s/ PXa, or other amplifier providing two channels of subwoofer output we recommend the following connections: Number of woofers Impedance to amplifier 1 Connect individual voice coils to individual amplifier channels. 3 ohms 2 Connect the two coils of each woofer in parallel and connect 1.5 ohms each woofer to an amplifier channel 3 Connect the coils of each woofer in series, connect the three 2 ohms woofer in parallel, and connect to bridged amplifier channels 4 Connect one coil from each of two woofer in series. Connect 4 ohms the remaining coils of the same two woofers in series. Connect the first and second coil pairs in parallel, and connect to an individual amplifier channel. Repeat for the second channel using the second two woofers. wiring diagrams 5

6 specifications Thiele-Small Free-air resonance fs= 29.9 Hz. Equivalent Volume of Compliance Vas= 1.95 ft liters Compliance Cms=.326 mm/n Total Damping Qts=.46 Electrical Damping Qes=.52 Electrical Damping Qms= 3.67 Piston area Sd= 53.5 in cm 2 Linear excursion Xlin +/-.37 in. Peak Excursion Xmax +/-.59 in. 2.83V 1 M, Voice Coils parallel SPL= 94 db 2.83V 1 M, Voice Coils series SPL= 88 db Efficiency no=. 28% DC Resistance, each coil Re= 2.6 Ohms Motor strength BL= TM Moving mass Mms= g Nominal Impedance Z= 3 Ohms Recommended amplifier power range, each voice coil Min.= 20 Watts Max.= 300 Watts Optimum Enclosure recommendations: sealed with filling sealed without filling vented bandpass with filling in sealed chamber bandpass without filling in sealed chamber sealed box volume.75 cu.ft 1.0cu.ft.8cu.ft 1.00cu.ft vented box volume 1.5cu.ft.5cu.ft.5cu.ft vent diameter vent length in car -3dB point <20 <20 <20 <20 <20 max in -car response peak 0dB 0dB 6.1dB@37.5Hz 1.0dB@38.7Hz 2.2dB@35.5Hz max group delay 5.1ms@33.4Hz 5.1ms@33.4Hz 17.1ms@25.8Hz 12.8ms@36.4Hz 13.2ms@34.7Hz in car max 40Hz 50Hz 60Hz 70Hz 80Hz graph A B C D E 6

7 Sealed enclosure responses graphs a & b Vented enclosure responses graph c 7

8 graphs d & e Bandpass enclosure responses 8

9 dimension drawings 9

10 warranty and service 1 - Keep your original sales receipt in a safe place. A copy of the receipt will be required to obtain warranty service. 2 - Be sure your retail dealer has written the date, the model number, and the serial number of the Product on the receipt. To give yourself an extra measure of protection, make a separate record of the information about your purchase and keep it in a safe place. In the event you misplace the sales receipt, your dealer may be able to give you a copy. Take a moment now to read the terms of your warranty. Check to be sure your sales receipt is dated and has the Product model number on it. Then put it away in a safe place. When shipping a Product in for service: Enclose a copy of your original sales receipt that has the date, the Product model number and serial number (if applicable) written on it. Always ship Products in the complete original packing material. Avoid shipping Products via the Postal service. If you must use the Postal service, be sure to register and insure the package. a/d/s/ Limited Warranty Analog and Digital Systems, Inc. (a/d/s/) warrants to the original consumer purchaser of the a/d/s/ Products described in this manual, that the Product will be free from defects in materials and workmanship for a period of one (1) year after the date of purchase. If the Product is installed by an authorized a/d/s/ retail dealer, the warranty is extended to (3) three years, a/d/s/ sole obligation under this warranty shall be to provide, without charge, parts and labor necessary to remedy the defects, if any, that appear during the warranty period. This warranty is the sole and exclusive express warranty given with respect to the Product. All other express warranties are hereby excluded. Neither a/d/s/ nor the authorized dealer who sells the Product is responsible for indirect, incidental, or consequential damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. I M P O RTANT - Keep your original sales receipt. Be sure the retail dealer has written on it the date, model n u m b e r, and serial number (if applicable) of the Product. This information is re q u i red for warranty serv i c e. This warranty is limited to: Products purchased from authorized a/d/s/ retail dealers in the United States. a/d/s/ will supply a list of authorized dealers on request. In order to obtain warranty service you must: Return the Product, freight prepaid, to the a/d/s/ dealer from which it was purchased, an authorized a/d/s/ independent service agency, or to a/d/s/. If necessary you may call a/d/s/ Customer Service for the names and addresses of authorized independent service agencies in your area. Provide proof of purchase in the form of a copy of your original sales receipt. The date, model number, and serial number (if applicable) of the Product must be written on the sales receipt. This warranty does not cover: Damage that is a result of misuse, abuse, accident (including but not limited to damage by water), faulty hookup, defective or maladjusted associated equipment, or the use of the Product with equipment for which it was not intended. Cosmetic defects that appear more than thirty (30) days after the date of purchase. Cosmetic damage caused by improper handling is also excluded. Products that are used for commercial purposes. The cost of removing or reinstalling the Product. Damage that occurs while the Product is being shipped to whoever will service it. See the information above regarding shipping procedures. This warranty is void if: The product identification or serial number label is removed or defaced in any way. The Product is serviced or repaired by any one other than a/d/s/ or an authorized a/d/s/ dealer or service agency. Analog and Digital Systems, Inc. 300 Wildwood Avenue Woburn, MA USA p f

11 11

12 PN rev 0