After you have purchased the Construction Plans and
collected all the parts and materials it only takes a 3-day weekend to build a
pair of LXmini and to hear in your place outstanding quality sound. If you can
work with a jig saw, a drill, screw driver and crimping tool, then you are set
to succeed. If not, then you might ask a friend to help you, or hire a high
school kid. No soldering is involved, only glue and screw.
The materials cost for this project breaks down like this:
LXmini Construction Plans: $105
4 SEAS drivers: $320
miniDSP 2x4 in a box: $115
Advanced plug-in: $10
USB power supply: $15
PVC/ABS pipes, couplers, cups: $60
Hardboard, Plywood, Feet: $25
Screws, spade lugs, cable clamps, terminal blocks, grip
60 ft of18 Gauge speaker cable, plugs: $30
.... which adds up to $700. In addition you need four
identical power amplifiers with 50 W to 100 W into 8 ohm capability and with
high (>20) damping factor. More power is not necessary.
Alternatively two 50 W to 100 W into 8 ohm capable amplifiers with high (>20) damping factor could be used for the woofers only,
where the chosen equalization of the low frequency response depends upon a high
damping factor. Two smaller power amplifiers with 5 W to 10 W capability and
<0.5 ohm output impedance could drive the midrange/tweeters without
significantly affecting the frequency response and output volume capability. But
the voltage gain of the low power amplifiers should be identical to that of the
woofer amplifiers, which requires the addition of an input gain stage. This then
opens the door to using "First Watt" style power amplifiers for the
2x4 HD ($205) and 2x4
HD1 plug-in ($10) instead of the miniDSP 2x4 unit and 2way Advanced plug-in
provides preamplifier functionality by having remote volume control capability.
It also adds digital signal input capability for streaming music directly from a
computer or CD player.
miniDSP 2x4 HD
Construction of the LXmini is brought into reach for everyone by a 24
page PDF with 3200 concise words of text and illustrated with 37 graphics and
photos. Buying the plans is a low risk investment. You could gain years of musical
enjoyment at the highest level of sound reproduction.
LXmini Construction Plans
- The LXmini Construction Plans are available as PDF
only. I will normally send them within 48 hours after being notified by
- To order the LXmini plans send a $105 payment via PayPal
to firstname.lastname@example.org with subject
line "LXmini plans".
Indicate your preferred email address for the file transfer (2.5 MB) and
give me your name and country/state for my records.
You can also order by sending a Money Order, Cashier's check or personal
check made out to Siegfried Linkwitz at 15 Prospect Lane, Corte
Madera, CA 94925, USA. Include your email address.
- I provide an Owners Support Page for updates to
Questions for help should be posted on the OPLUG
offers a LXmini Speaker Kit containing the four SEAS drivers, a miniDSP 2x4 and
damping material, a wood parts kit, as well as other useful hardware for $472.
PVC/ABS Schedule 40 pipes of 4" and 3" diameter,
end caps, rubber couplers, 2-conductor wires, terminal blocks, screws, a
crimping tool, silicon adhesive, etc. can be found at your local hardware
store. The pipes need to be cut to specified lengths and several holes
drilled into them. No soldering is involved.
|PowerBox 4180 &
PowerBox 4400 pro configurations
for LXmini, LXstudio and LX521 Turnkey Systems or Kits and a Price
The ease of construction and the price put the LXmini
within reach of many audiophiles and music lovers. Some universal CD/DVD players
have built-in volume control, which makes a preamplifier unnecessary. The audio
output from a smart phone or tablet is usually not sufficient to drive the
LXmini to maximum volume, but provides in many situations enough sound.
A pair or more of LXmini is a "must-have"
valuable reference and tool for professionals in the audio industry, like for
speaker designers, amplifier designers, equipment reviewers, recording/mixing
and sound production engineers, microphone designers, 3D sound algorithm
designers, psycho-acoustic researchers and codec developers.
Upgrade from PLUTO to LXmini
power amplifier section of the PLUTO electronic module is ideally suited to
drive the LXmini. For such use the
overall voltage gain is increased to 34 dB. Some circuit connections have to be removed and others added. Woofer and
full-range amplifier input connections have to be provided. The PLUTO module
could become a stand-alone power amplifier for the LXmini. Details have been posted on the LXmini owner support page.
do not plan to provide guidance for modifying the mechanical design of PLUTO.
Follow the LXmini instructions for that. The low end response, which is
determined by the air volume and amount of stuffing in the pipe, may be
different from the LXmini in your PLUTO implementation. Measure the response
with a microphone 0.5" from the woofer cone and equalize it by following
the approach in the LXmini configuration file for the miniDSP 2x4. Take it as a
learning project and consult with the OPLUG.
My recommendation is: Share your current satisfaction with PLUTO by making
someone else happy with it, or put it to different use. Then build the LXmini
Alternatively, dismantle your PLUTO, reuse woofer drivers and modify the
electronic modules, and rebuild everything else according to LXmini plans.
And foremost: Have fun!
Note: All material is copyrighted and for the
personal, non-commercial use by the person who bought it from LINKWITZ LAB.
may not be passed on in any form for use by others. |
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