LX521 Linkwitz® Lab Open Baffle 4-Way Kit, PAIR

LX521 Linkwitz® Lab 4-Way Open Baffle Speaker Kit - Drive Units Only

Price shown is for a PAIR

The LX521 is a full scale DIY speaker design from Siegfried Linkwitz of Linkwitz Lab. Also see the more compact LXmini Speaker Kit.

Purchase price shown for the full set of drivers includes a 10% discount. 

Please note: The LX521 construction plans are required to complete this project. Purchase here if you don't already own them.

This Kit Includes:

4x Seas 27TFFNC/G (H1396) 1" Textile Dome Tweeter

2x Seas MU10RB-SL (H1658-04) 4" Curv Cone Upper Midrange

2x Seas U22REX/P-SL (H1659-08) 8" Curv Cone Lower Midrange

4x Seas L26RO4Y (D1004-04) 10" Aluminum Cone Woofer

Also Available:

ASP.4 Analog Signal Processor - ASP crossover, available from the drop down menu, power supply not included

miniDSP Flex Eight - DSP crossover, replaced the miniDSP 4x10HD, order from miniDSP.com, we can help you load the x-over file onto it

LX521 Flat Pack cabinets - click on live link for information and to order 

About the LX521 from Siefried Linkwitz:

"For many years now I have refined, lived with and enjoyed the ORION (2002) and PLUTO (2005) loudspeakers. 

I have learned that the loudspeaker's radiation pattern and placement in the room are more important than the acoustics of the room.

Ever since I started building loudspeakers with cone-type drivers on open baffles several decades ago, I tried to find the optimum shape for those baffles given the drivers available. For ORION the drivers were selected primarily for their volume displacement and low distortion capabilities when used in a 3-way, active system. The LX521 evolved from experimentation with minimal width baffles, which can provide a more uniform dipolar radiation pattern at higher frequencies, if also suitable drivers are available. Inevitably this leads to a 4-way design, which I mostly tried to avoid in the past. 

The shape of the midrange/tweeter baffle was arrived at empirically for the chosen SEAS drivers and after many acoustic free-field measurements. The two SEAS woofer drivers are housed in a V-frame baffle, which exhibits reduced resonance above the operating range of the woofer and some force cancellation. 

A bridge over the woofer isolates the midrange/tweeter baffle from woofer cabinet vibrations. Woofer and midrange/tweeter baffles can be angled independently from each other. The bridge could also be built taller and the midrange/tweeter baffle tilted downwards to aim at the listener in front of a mixing desk. The woofer baffle must rest on the floor for ground plane reinforcement of its output.

The LX521 Analog Signal Processor splits the broadband line level input signal into woofer, mid and tweeter frequency bands. It equalizes driver and baffle response for each channel and filters it with LR4 response. The midrange signal is split after the power amplifier by a passive crossover filter into lower mid and upper mid driver inputs.

Frequency response on upper midrange axis and horizontal dipolar response in the frontal hemisphere are designed for neutral timbre of the the stereo phantom scene, when the loudspeakers are placed in the room as suggested. The aural scene is rendered with clarity and detail, both spatially and tonally."

Full documentation on the LX521 can be found on the Linkwitz Lab website.

Seas 27TFFNC/G (H1396) 1" Textile Dome Tweeter

Seas MU10RB-SL (H1658-04) 4" Curv Cone Upper Midrange (FU10RB H1600-08 shown)

Seas U22REX/P-SL (H1659-08) 8" Curv Cone Lower Midrange

Seas L26RO4Y (D1004-04) 10" Aluminum Cone Woofer