MiniDSP-based system GALLERY

[gainphile]

Show us your MiniDSP builds....!

This is my latest. 2x4 MiniDSP, Sure 4*100W amp, and SMPS in a no-frill case.

Great attention has been given in the operational aspect. It could be turned on and off without that nasty thump so prevalent with active systems.

 

[boris81]

Cool! Nice work, gainphile!

I'm interested in building the same thing and I have a few questions.

1. I want to have remote controlled gain. I know the miniDSP boards have headers to connect to a pot. Have you investigated any solutions that can plug in directly? Are the miniDSP gain control headers digital and is attenuating the miniDSP analog outputs a better place to do this?

2. I will need more channels, 6 at least. I'm thinking of making 2 modules, each consisting of a 2x4 miniDSP board and a Sure 4x100W amp. Can I use a 2x4 miniDSP board to implement 1 speaker channel or are the miniDSP plugins strictly working in a pair of channels? In other words can I use 1 miniDSP board to route to a tweeter, mid and a woofer or am I restricted to doing a pair of tweeter and mid on 1 board and the pair of woofers on another?

 

[doug20]

has anyone used a DCX box yet ? I have a DCX and 1124p box that I could rip apart and use. I also have some Ashley DBX boxes around unused. Im just curious if someone else has tried these??

 

[minidsp]

Great stuff and nice work!

That's a big power supply for that 400W amp.. Meanwell?

BTW, great idea on having a gallery thread. Let me put a sticky on this thread.

DevTeam

 

[knuisje]

Thought I can show my minidsp based pre-amplifier as well.

It's basically a minidsp & minidigi with two pcm1794 dacs connected by I2S. Also included is a pcb for remote controlled switching 4 digital and 2 analog inputs and volume control. Volume can also be controlled by a rotary encoder. It displays the info on a vfd display.

 

[curryman]

Knuisje,

nice setup! Looks like you used twisted pair dacs, right? What about the volume control? Analog or digital domain? miniDSP or DAC?

How did you realize the digital optical inputs? Simply paralleling Toslink receiver to the build in of the miniDIGI?

I am about to realize a similar project with a miniDSP 2x8 and multichannel analog volume control (PGA).

 

[knuisje]

Hi curryman,

Yes, I used 2 COD and IVY pcb's from Twisted Pear. The volume control is in the digital domain. I used a microcontroller to generate 0 - 3.3V for the master volume control of the minidsp.

The new optical inputs are TORX147 receivers. I removed the 47uH smd inductors from the minidigi so the original receivers are cut off from the power. I connected the new receivers with wires at the same points as the original ones.

 

[minidsp]

Very neat front panel and enclosure! Is this LCD + Rotary encoder + source selection a project of yours? You should sell a little kit to go with it, I'm sure that a lot of people would love it!

Quite a lot of things under the hood and thanks for sharing your trick for the optical receivers...

Devteam

 

[knuisje]

Yes, I developed the control board on my own with some support of other Dutch DIYers. It can switch between 4 digital and 2 analog sources using relays and controls the master volume of the minidsp by generating a voltage. Also you see connections for a rotary encoder (volume control), IR receiver (volume & source selection), pushbutton (source selection) and LCD display. Everything is controlled by an AVR microcontroller. A standard Philips remote with RC5 codes can be used and the board can learn the systemcode of the remote.

I'm using the board for one year now and it's functioning very stable, haven't had a single issue with it. Several other Dutch and Belgian DIY-ers are using this board as well.

 

[kike01]

Hi knuisje:

Congratulations for your work. It´s a very useful concept.

¿Do you know if the analog+ digital selector board is available?.

Thansk

 

[gainphile]

Nice build by 'Beau'

DIY audio: what are you building?

 

[Beau]

Ha !! Thats me, what a suprise.

Just waiting in isolator board now.

 

[col]

2 X MiniDSP Balanced 4 inputs and 8 outputs boxed in a 1RU

2 X MiniDSP Balanced 4 inputs and 8 outputs boxed in a 1RU using a laptop SMPS and 12 XLR connectors. Front panel USB access.

more pictures of the build here:

MiniDSP Balanced

cheers,
col.

 

[merlin el mago]

1 X MiniDSP Balanced 4 inputs and 8 outputs boxed

Just finished 1 X MiniDSP Balanced 4 inputs and 8 outputs boxed

 

[Hiyohiyo]

PORTABLE system for miniDSP

PORTABLE miniDSP 2*4 system build.
Use 3Way hybrid-handmade-earphone.

Use Cross Over and Time Alignment.

 

[Rob41]

Thought I can show my minidsp based pre-amplifier as well.

It's basically a minidsp & minidigi with two pcm1794 dacs connected by I2S. Also included is a pcb for remote controlled switching 4 digital and 2 analog inputs and volume control. Volume can also be controlled by a rotary encoder. It displays the info on a vfd display.

Wow, that's really nice work knuisje!

 

[neutron7]

Its a pair of tri-amped speakers. used on my front channels(and stereo of course)

tweeter: SEAS 27TDFC with 75uf film capacitor for safety (in case i make a mistake programming)
mid/bass: SEAS ER18RNX
woofer: CSS SDX10

tweeters and mid/bass powered by emotiva upa-500
woofers powered by emotiva upa-200

miniDSP 4x10(2x8 plugin)

I am really happy with this. it sounds fantastic, very clear, goes down as low as i can hear, and i can make any changes i like without buying new crossover bits.

other people have asked me if the emotivas should be stacked. here they are after being on with the TV on for a few hours and then loud music for a couple of hours.

not bad at all 28.4c is the hottest thing on the picture, and i still haven't put feet on the miniDSP to get it off the vents of the top emotiva.

a cool trick, if you do something like this, and keep your old center and rear channel powered by a reciever, is to adjust the PEQ on the midrange to be wrong in a similar way to your old speakers, and use that miniDSP preset when watching things with surround. it makes the miniDSP powered speakers sound close enough to the old ones that there is no strangeness.

i have:
preset 1: music. everything full flat and REQwizzed as best possible for my room. lots of bass extention

preset 2: same as above but "neighbors home" bass is reduced and no "linkwitz" boost below woofer resonance.

preset 3: all out but with midbass altered to sound more like the little polks i have for surround speakers

preset 4: same as above but with "neighbor home" on the bass.

 

[TurvenuijaFIN]

Unfinished power amp project.

Minidsp 2x4 + 4xHypex ucd400hq
The old Yamaha power amp enclosure

maybe I change housing better.

I would need more gain minidsp's output.

An externally hosted image should be here but it was not working when we last tested it.

 

[milosz]

A biamp

The guts - DSP board, USB stuff, power, & amplifiers

Cosmetics

The speaker getting prepared for some measurements

 

[tcpip]

For some reason, no one's posted anything here for some time, and I didn't know this thread existed, so I never posted my speaker project.

I built the Darbari -- the enclosures were done in 2013, the measurements and the crossover were done in Sep 2014.

I used the MiniDSP 4x10HD, feeding six analog outputs to a Marantz AV receiver in 7-channel mode.

Lots more photos on my pages including a lot of construction details.