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3-way Active multiple plywood loudspeaker boxes with expensive drivers:
RAAL 70-20XR AM, Audio-Technology 15H and AURASOUND NS 10-794 4A
Thomas S:
"And with 800 Watt horsepower per box it is like listening on steroids - Very
controlled bass and the soundstage is almost holografic"
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Subwoofer amplifier with EQ
Wilco A has build an Amplifier for his subs with DCN23 and Hypex UcD modules
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The Organ builders own DIY loudspeakers
Roland has build a set of loudspeakers with Mundorf and Accuton drivers and powered with Coolback II 600
(3-way Active Amplifier)
Roland:
"I have tested a couple of different setups right now. They all sound really great."
"The active way with your Coolback is
much more open, direct, fast, clean and colourful."
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Making a pair of Vienna Acoustics Mahler fully active
Stefan have had a pair of Vienna Acoustics Mahler loudspeakers for a while without being really satisfied...
When acitve:
"Even with this basic setup the Mahlers sound way better than the original passive setup, and we are talking about 10.000€ speakers."
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Active B&W in a 7.1 Home Theatre system
Ole has invested in 7 pcs Custom-made Wall-Hung Active Amplifiers with Ground Sound electronics.
All is based on the Ground Sound
Active Amplifier Solution and include both our digital crossovers DCN23 & DCN24 - which is
DCN24 (4-way) for the front speakers and DCN23 (2-way) for the rest of the speakers.
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Active DIY loudspeakers powered by Ground Sound electronics
Steen:
"The sound quality is very good in my opinion (naturally )"
"Yes - the Ground Sound modules are a bit expensive, but I must say that I have not regretted the purchase.
The spending is quickly recouped in saved money on expensive components for passive filters"
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Acitve NHT system
David has a set of NHT M-60 Xd with subwoofer S-80 for the desk top in his office.
The system is powered by DCN24 and an Integra multi-channel amplifier.
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Active DIY Ribbons with assisting bass boxes
Jan has implemented an active solution with a pair of modified Chassis 600 for his ribbons.
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Active 3-way DIY Seas loudspeakers
Matti has bought a pair of Chassis 1503 to make sure that his DIY speaker will get enough power.
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Activating Dali Evidence 870
Thorbjørn has upgraded his old pair of Dali loudspeakers and given them new life with two Chassis 603 active amplifiers.
Thorbjørn: "I looked at my trusty speakers and though that if my subwoofers could work that great filtered by DCN23, then why not do the same with my front speakers?"
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Antique full-range horns and subwoofer loudspeaker system
Bjarne is very technical minded and he has always experimented with technical solutions
beyond what the "normal" DIY person would use.
Bjarne uses a DCN23 Digital Crossover module and PSU DCN Power Supply.
New colours - Wauw - Totally different impression
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Rick's DIY Dynaudio loudspeakers
Rick:
"Every evening I am enjoying the sound through the new DCN23 boxes..."
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4-channel active amplifier
Project build for LautsprecherShop.de with our DCN24
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Meil's Magico Mini II clones
Meil has really put a lot of energy and time into this project - the result is extremely nice
Meil:
"it's really an exciting product with a myriad of opportunities"
"....I feel like building some new speakers because it was so easy in terms of crossover.”
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Herwig from Austria
DCN23 and Power Supply PSU DCN in a ModuShop Galaxy GX288 casing.
Capaciti 160 electrostatic loudspeakers powered by good old White Audio Class A Poweramp / DCN23
Updated DCN23 with AD8620 - Herwig:
"Music is music." 
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Claus Karl has made two mono digital crossover boxes with a DCN23 kit
Claus Karl: "I am the proud owner of a DCN23 kit and enjoy every hour I can hear music with it."
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Peter K's horn system
The system has been updated - second half of gallery...!
Peter bourght the amplifiers from gallery 3.
Peter says:
"I do not miss any of my previous amps!"
"The sound is still clear and clean with a nice sense of ‘presence’ "
"the ‘blocks’ are VERY silent considering that the sensitivity of the speakers is +110 dB/1 watt(!) "
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Oliver has made a Box with our DCN23 + PSU DCN.
Oliver P: "The speakers don't look fancy yet, but they sound incredibly good."
"I also appreciate the overall tonal balance of the DCN23. It doesn't sound digitally at all."
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Svein has made a smaller pair of Studio Monitors
Svein: "It's the first time I build something this complicated so I was prepared for some challenges -
BUT - thanks to good assembly descriptions from Ground Sound and Hypex it was a relative painless job"
"I am very surprised by how good the sound quality has gotten"
"The bass is deep, fast and well defined"
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Thomas R.
New pictures have been added. The Construction work has progressed - now you can get an idea of the final looks - maybe...
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Harry's active Amplifier Chassis with digital crossover - DCN23
Harry have "converted" to active drive and in this gallery you'll find details and comments of the "convertion".
Harry: "I changed my current speakers to get a proof of concept - with big results.
Very big difference from the old passive filtering!"
"Now I am going to built new speakers that can take better advantage of active filtering."
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Morten's "Boxed" Coolback 603
Morten bought a pair of demo Coolback 603 to upgrade from passive filtering to active filtering.
Morten: "The bass is clearer and with much more correct body to
the instruments. The mid now has more direct access to the recording and the same applies to the tweeter"
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Proto types / experiments of Tobias Lindell - Lindell Audio
Tobias is a studio/mix engineer and producer. He has looked into our products and this has evolved
to both Coolbacks and Amplifiers.
Tobias: "It sound really great - open and fine highs"
Interesting measurements with Class D amplifier and PA3CC amplifier on RAAL Ribbon tweeter...
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Markus has updated his old DIY mono power amplifier.
There used to sit a 150W MOSFET amplifier module - now it has been replaced with two of our amplifier
module from the Sale page: PA3CCmkII, TIP.
Markus: "Now I am very satisfied with the result! (On the first sight they seem to be equal to the class A amplifiers)."
New development: New PSU
Find out what has happened to the sound quality...
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Jan Erik has made a pair of Active Amadeus loudspeakers:
The sound was quite OKAY and much better than from any other loudspeaker that he have owned previously.
Most astonishing is the bass control and the effect of tweaking with the room modes - in his room 42Hz and 59Hz.
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Markus has cloned the Pure Passion One loudspeakers:
It is a very big 5-way system in 5 seperate cubes - all active.
"The sound "flows" really free in the air, it is nearly incredible that it comes from the speakers." 
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The Neujahr digital crossover box
The DCN23 filter kit is installed in a transparent box
Neujahr: "It's sounds very well and makes a lot of fun to hear."
"The sound is indescribable, the smoothness and the dynamic, the voices,
the transparency and the feeling of live playing."
"The result: That's music, the music is alive like you've never heard it before."
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Nils Hjelte has made this nice active box
Nils:"It works and soon I will use in a real setup"
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Jesper AA. Nielsen's Room Correction Filter
and Active Loudspeakers
Jesper has made a DCN23 box for room correction experiments and tweaking.
And now he also has activated his loudspeakers - yet we are missing a picture of the loudspeakers themselves
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"The Pimster"
"The Pimster" as he calls himself has built a Seas Froy inspired loudspeaker and it's a very nice result.
The loudspeaker is a 2,5-way based on two Seas W15CY001, ScanSpeak D3004/660000 and our electronics - Coolback303
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Kim H. - new subwoofer boxes with 2 x 12" XXLS Peerles
He has installed seven amplifier blocks for his 5.4 surround home theatre. The loudspeaker system consists at the moment
of five 2-way speakers with two 6,5" ScanSpeak bass/mid driver and one ScanSpeak 1" alu dome and the subrange is performed by
5pcs. boxes with Peerless 12" XXLS subwoofer drivers. Definitly a Home Theatre with a huge dynamic range...
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Jeroen KV's Active 2,5-way Open Baffle Loudspeakers
Jeroen has constructed a pair of open baffle loudspeakers with 2 x 12" woofers and a B&G planar driver.
He has chosen the obvious approach and made them active...
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Peter Hess's Stereo 3-way Digital Crossover
Peter believes in very solid boxes. The loudspeaker boxes are a combination of metal, MDF and some secret damping
compound to reduce all unwanted box vibration.
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Markus Packeiser's Stereo 3-way Crossover
Markus has acitvated his "Topas plus", based on a Hobby-Hifi concept.
He has build his digital crossover in a conventional size box - it looks pretty good
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Bernd Ewald's project DCN23 kit
He have activated a pair of DIY loudspeakers with Eton and Seas drivers. The filter will be setup as 3-way stereo with a
Linn Unidisc SC sourse and a Chakra multi channel power amplifier.
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Stig's active ATC
Stig bourght the 5 active amplifiers from gallery 6 and activated his ATC SCM-100.
In this gallery you can see how simple it was...
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Gerd D's "experimental box"
A little upgrade and modification...
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Ruud Groot's "Coolback"
Elektor / Ground Sound combi. It's build a bit like the coolback system.
He's saying: The systems sounds great and tuning to my ears content is sooooo easy!
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Stefan Wössner:
By the way, both DCNs worked right from the start. No search for errors necessary. Your assembly instructions are very good.
I started with a generic DCN setup, based on the recommendations of the speaker producer (Manger) for crossover frequency and
characteristics. The woofers are build in a closed cabinet and show a drop off below 80Hz (calculated), so I corrected this to
be linear down to 30Hz. It already sounded great. Then I used the programming based on my measurements, where I corrected some
room resonances and pulled up the Manger's soft roll-off at high frequencies. The result is a frequency response within a 5db
range from 28Hz to 20kHz with a sweet-tempered phase.
The listening result almost knocked me off my shoes. Crystal clear heights like I never heard them from Mangers and a very tight an low bass.
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