It has been a while
since I finished my PMS loudspeakers and I was
waiting to finish my also DIY listening room to
send you the photos of the ensemble. As a young
and poor engineering student, I decided to go DIY
for the whole process which started 3 years ago.
At that time, I dismantled the table tennis room
at home and converted in a dedicated 2-channel
listening room with also a projector for film
The PMS loudspeakers
where the starting point. Having already built a
loudspeaker kit (Seas' Embla) I decided to go for
a floorstander, and I had the time and space to
build their difficult cabinets. As seen on the
photos, each enclosure has 7 braces, and
everything is built from 19mm MDF. Internal
damping is made from rockwool and polyurethane
foam, bituminen pads and cabling is braided CAT6
with the number of wires proportional to power
requirements between drivers. External finishing
is fabric upholstered, with black HDF feet and a
top cover made of phenolic resin custom cut to
the loudspeaker' section profile. Crossovers are
fitted in separate boxes behind the cabinets.
For the room building,
I've studied acoustics and mechanical vibrations,
and it has been designed for Hi End listening.
RT60 is very well controlled to 0,35s in all the
frequency ranges through absorption and
diffusion, and all first and second reflections
are controlled and adjusted by ear and by
measurements. Aesthetically, I wanted the room to
be black, to improve film projection contrast and
to prevent reflected light from reaching the
screen. I also wanted to obtain and
"infinte" perception of music
soudstage, at dimmlight, which is really
palpable. I could write a hundreds of lines of
the whole process, regarding room acoustics
design, acoustical treatment construction,
loudspeaker positioning and electrical
installation but let's concentrate on the final
UOOO, is the first word a
friend of mine said, with the first
second of music played [he owns a 40k
system]. The PMS are really on the HI End side of
this hobby, and each day I enjoy them more. I
completely agree with your thoughts regarding the
overall character of the speaker, it's is dynamic
and very natural sounding due to the lightweight
paper cones, with a clean and fast bass response.
I noticed that the bass improved significantly as
I lifted the loudspeakers from the floor, and I
recommend to the other builders to try it out. I
finally left 11cm.
The integration between
drivers is magnificent, and I feel that
the tweeter is in a higher league than its
companions, as the treble is extremely
transparent and detailed. As usual with this
drivers, distortion starts to increase when
demanding lots of energy from musical events but
it's not a common situation in my musical tastes.
Nevertheless the main and the strongest point of
this louspeakers is their capability for
soundstaging. In any system I've heard, there
isn't a sense of depth as in my listening room.
It's true that the speakers are far away from the
front wall, and that acoustical treatments help a
lot, but none of my friends owning 6 figures
systems (+100k) can't compare as per sense
of scale and depth of the soundstage. Now I'm
addressing the acoustics of the listening room of
one of this friends (150k), whose system is
not really enjoyable due to acoustical problems.
It has been a long
and time consuming process but the experience
gained and the final result is totally
worthwhile. A clear conclusion I extract from
this experience is that room acoustics play a
major role in this hobby and that it's always
rewarding to look for better sound through
I'll like to thank you for the
design of this loudspeaker and for the
immeasurable task you are doing to the DIY
community . I want also to thank to my parents
for their also immeasurable patience and to
Maria. Please find attached a summary of the
process in photos.
Off this topic:
1- Nice Web update :)
2- My Next station: DQTWT ;)
3- Recommendations for a 'hardcore' classical
music loudspeaker (prelude, jensen, DQTWT...)
4- Very nice photos in all your projects, you
take great care of this aspect!
5- PMS photos on next email.
Thanks for you thorough report back on the PMS
project. I can only dream of how the PMS sound in
your room. I'm sure a lot of speakers will
benefit from proper room treatment, but only few
have the possibility of a dedicated room for
hifi. How the DTQWTs will sound in your room
makes my dream even wilder!
Hardcore classical? DTQWT-mkII - and it can play
hardcore heavy metal too!
Best regards, Troels