Rob from Australia has used the 505 panels very successfully with a great looking sealed bass box / driver.
The bass driver is an SB Acoustics 6.5” Satori unit in a sealed 15 litre box.
The crossover point is around 500Hz and the subjective performance is considered to be excellent.
Go to http://robmid42.wixsite.com/diyaudiokits/er-audio-esl-speaker-kit to have a look at Rob’s first prototypes using the 505.
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Fine Audiophile Equipment
Designers and Manufacturers of Electrostatic Loudspeakers and Fine Audiophile Equipment
E R Audio Pty Ltd. ACN: 120 797 775, ABN 48 120 797 775
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Please note that domestic sales incur a 10% Goods and Services Tax (GST)