3. REG . 6-13-1995 . 899,531 . ASPEN PERFECT CONDITIONS . INT . CL . 3 . REG , 6-13-1995 . 899,535 . LAB SERIES . INT . CL . 3. REG . 6-13-1995 . 899,537 .WinSpeakerz has six types of crossover calculators: 1st, 2nd, and 3rd Order Butterworth, 2nd and 4th Order Linkwitz and 1st Order Series with adjustable WinSpeakerz is our loudspeaker simulation program for Windows XP/Vista/Windows 7/8. This popular speaker simulator lets you propose various speaker systems DIY Project # 12 - True Audio's WinSpeakerz Design Software and "Introduction to Loudspeaker 1st order Series, and 2nd and 4th order Linkwitz-Reilly. WinSpeakerz has six types of crossover calculators: 1st, 2nd, and 3rd Order Butterworth, 2nd and 4th Order Linkwitz and 1st Order Series with adjustable Free Shipping Promotion: Buy more items from the same series, product code beginning with PEX-, and you can get free shipping for an order of over $129.00 The WinSpeakerz software will allow you to design high quality speakers yourself. This simulator proposes indeed many loudspeakers allowing to evaluate them