div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentsp4-manual-schem-audio-circuitry-provides-unequaled-performance-under-actualhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: SP4 Manual Schem - Audio Research · circuitry provides unequaled performance under actual dynamic listening OTHER PROOF OF PURCHASE OF THE Bass tone control circuitry is loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader031fdocumentsnetreader031viewer20220220185b86216a7f8b9a2e3a8c3f2fhtml5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=documentsp4-manual-schem-audio-circuitry-provides-unequaled-performance-under-actualhtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: SP4 Manual Schem - Audio Research · circuitry provides unequaled performance under actual dynamic listening OTHER PROOF OF PURCHASE OF THE Bass tone control circuitry is loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader031fdocumentsnetreader031viewer20220220185b86216a7f8b9a2e3a8c3f2fhtml5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=documentsp4-manual-schem-audio-circuitry-provides-unequaled-performance-under-actualhtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: SP4 Manual Schem - Audio Research · circuitry provides unequaled performance under actual dynamic listening OTHER PROOF OF PURCHASE OF THE Bass tone control circuitry is loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII=...