http://www.subwoofer-builder.com/ Some of the more interesting content recently added at subwoofer-builder.com en-us entry21 http://www.subwoofer-builder.com/qrdude.htm The latest version of QRDude now shows the lobes produced when multiple 1D QRD diffusers are used side-by-side. The changes that occurs as the incoming signal angle is varied can also be modelled. This follows on from version 2 which introduced support for 2D QRD panels. The user guide and technical reference have also been updated. entry20 http://www.subwoofer-builder.com/qrdude.htm Free Calculator for designing standard and advanced QRD panels. Comes with User guide and supported by a detailed overview of how to use QRD diffusers entry19 http://www.subwoofer-builder.com/speaker-building.htm The build order for the speaker building instructions has been changed to group like operations together, making for a simpler build. Additional photos and drawings have also been added to help the novice builder. entry18 http://www.subwoofer-builder.com/subsaver.htm A simple, yet versatile one-chip high-pass filter was developed during recent forum discussions. Subsaver is the free downloadable calculator for this design. entry17 http://www.subwoofer-builder.com/milling/index.htm A couple of DIY jigs allow you to use your router as a simple milling machine. Illustrated article describes both horizontal and vertical milling entry16 http://www.subwoofer-builder.com/cleanbox/cleanbox.htm An ART Cleanbox has been purchased to provide gain and XLR connection to fully drive a professional amp. Two capacitors were changed, extending the low frequency response for subwoofer usage. Photos included entry15 http://www.subwoofer-builder.com/bandpass Work has started on a 6th-order bandpass sub with 18inch Mach5 driver. entry14 http://www.subwoofer-builder.com/resonances Resonance experiments to determine standing waves inside speaker enclosures. entry13 http://www.subwoofer-builder.com/sawboard DIY article on building and using a sawboard entry12 http://www.subwoofer-builder.com/flares-25mm.htm Some out-of-round pipe meant that an improved jig had to be built for using the router to clean up the outside edge of heat molded flares. The new adjustable jig also holds the pipe more securely than the old one. entry11 http://www.subwoofer-builder.com/drivers.htm New importer, Affordable Drivers, is now bringing Mach5 Audio drivers into Australia. Link to his site added. Designs coming soon. entry10 http://www.subwoofer-builder.com/pvc-bends.htm Too tight a bend in your ports can cause turbulence. Here is an illustrated guide to what you should do. entry09 http://www.subwoofer-builder.com/ib-tempest.htm Australian builders of IB subwoofers have been frustrated by the recent lack of affordable drivers. The new Tempest-X driver being sold by Audiomarketplace appears to have saved the day. Whilst dearer than the the Jaycar driver previously used, it has an Xmax of 27mm and uses Adire Audio's renowned XBL^2 motor technology. Follow the link for two, four and six-driver designs. entry07 http://www.subwoofer-builder.com/drivers.htm The decision by Jaycar, an Australian audio components reseller, to discontinue their Venom range of subwoofer drivers has outraged the Infinite Baffle community. The 15 inch driver was the only affordable driver suitable for these simple, but high performance designs. Much gnashing of teeth can be heard as the hunt for a replacement goes on! entry06 http://www.subwoofer-builder.com/sketchup/rollover.htm Illustrated tutorial for drawing extruded surfaces that follow a circular path. It's a handy technique for drawing routed rollover edges and port flares. This walk-through is much more detailed than the default help that comes with sketchup. entry05 http://www.subwoofer-builder.com/flares-rectangular.htm Drawings and guidlines for using split PVC pipe to create flares and smooth bends for slot ports. Includes tables to estimate usable velocity when compared to conventional round ports entry04 http://www.subwoofer-builder.com/flares-25mm.htm Details of heat molded flared ports have been updated to include the ten inch diameter flared ports for SPL competitions.These are currently being evaluated in the UK by a current SPL record holder in his class. entry03 http://www.subwoofer-builder.com/ib.htm An infinite baffle sub has been completed. Twelve 15 inch drivers on two manifolds, driven with around 1700watts. See all the construction details and integration using the REW software. How does it sound? Scary. entry02 http://www.subwoofer-builder.com/amps-all.htm Added links to instructions for modifying boost circuits on several of the Jaycar plate amps. Also added Behringer amps suitable for subwoofer use, along with links to suppliers with good prices entry01 http://www.subwoofer-builder.com/flare-testing-pt3.htm The testing of flared ports continues. The latest round of tests looked at whether the inside flare could be smaller than the outside flare without effecting performance. The short answer is yes, by around 15%-20%