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LYECO LY802F SEALED TOWER

 Giovanni Militano   Canada Flag   To email Gio, type out the email address.

INTRODUCTION

This is my entry for the Lyeco LY802 Full Range Contest The LY802F drivers have a Qt of 0.72, and thus are likely best suited for an open baffle design, but should also work well in a sealed enclosure. I tried some ported (bass reflex) enclosures, but I was not happy with the estimated response curves. With the success of the Sealed Fostex FE127E project, I thought I would keep things simple and design sealed enclosure for the LY802F.


LYECO LY802F SEALED TOWER

For the LY802F driver, the optimum sealed volume is in the order of about 300L! However, this volume has a very poor WAF. With a 100L enclosure you can get a reasonably tall and thin enclosure with a good response. Below a volume of about 100L you start to get a hump in the frequency response at about 100Hz. Figure 01 shows the 100L frequency response calculated using WinISD.

Calculated Frequency Response - Lyeco LY802F Sealed Tower Speaker
Figure 01: Calculated Frequency Response - Lyeco LY802F Sealed Tower Speaker

A sealed enclosure will provide excellent cone control resulting in great midrange and nice tight bass. A subwoofer can be used to fill in the bottom end. A crossover point of about 50-60Hz should work well. However, some may be happy with the full range response, F3 ~ 55Hz and F10 ~ 37Hz.

A proposed enclosure design for the Lyeco LY802F Sealed Tower is shown in Drawing 01 with the design notes shown in Drawing 02.

Lyeco LY802F Sealed Enclosure Plan
Drawing 01: Lyeco LY802F Sealed Enclosure Plan

A single driver design will need a baffle step correction (BSC). The amount of attenuation required will be room and amplifier dependent. About 4 to 6 dB is a good starting point. Use the component values shown in Drawing 02 and tune the BSC to your room and amplifier.

Lyeco LY802F Enclosure Design Notes
Drawing 02: Lyeco LY802F Sealed Tower Notes