audio therapy 
Sunday, April 13, 2008, 11:37
Posted by Anders
Since i sold of my old DIY PA system i have been in limbo, so it was time to start over with the new ones, the new speakers were funded by the money i got for the other ones to a great extent.

These are the 10" mid transducers from the italian brand B&C with a sensitivity of 100dB/W/m, meaning that they generate 100dB at 1W, valid for the range 100-4kHz, the power handling is rated at 700W continous.
more info : ... prodotto=5

These are the horns that handle the higher frequencies, coupled to a 2" high frequency driver the sensitivity is 108/dB/W/m from 1kHz and upwards with a 60 by 40 deg. pattern.
more info horn : ... rodotto=91
more info driver : ... re/137.pdf

Now for the boxes, nothing to complicated and mainly for prototype purpose, made out of fiberboard they were cheap and quick to build, here are some pictures i took during the build of the top speakers :

And finaly here is the result :

Thats it for the top speakers, since these speakers require some low end backup i started sketching on the subs and some week's later the sub drivers arrived.

These 15" drivers can take 2kW continous power without changing their specifications and has a sensitivity of 96dB/W/m, to put these figures into perspective a normal hifi speaker average about 90dB/W/m sensitivity and around 100W power handling.
more info : ... rodotto=37

The magnet system and voice coil is air cooled by multiple vents to suppress power compression when the temperatures goes up, higher temperatures increases the resistance in the voice coil and lowers the efficiency.

The sub boxes are simple and straight forward, it took me two days to complete them, they are not the final design by any means but with some signal manipulation i can achieve a satisfying result for most situations.

Here are some pictures from the build (not that many, i was busy building) :

So put it all together and you end up with a small set looking like this :

I'm still working with the processor settings for this setup but the results so far is rather impressive for a system of this size, using specialized drivers for each range and covering the the entire voice range in one driver sure gives some advantages not found in my previous system.

The components used in this system can be found in many professional systems from NEXO, EAW and TCS to mention some, the speakers are processed by a DBX driverack 260 with messuring capabilities and powered by 3 QSC PLX 2402 amplifiers, each driver has it's own amplifier channel, no passive filters are used.
more info processor :
more info amps :

The system in it's whole will make it's debut at the yearly DIY audio meeting here in gothenburgh on 19:e of april.
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Boards of Canada - the campfire headphase 
Saturday, March 29, 2008, 22:11
Posted by Anders
I just wanted to let you know of a recent "best buy" in music on my part (rare thing nowdays mind you).

Today I wisited a wellstocked musicstore here in Gothenburg, and i just so happened to come across a familiar, well, band (in lack of better terms) - Boards of Canada.

The album "the campfire headphase" is a... rather odd compiation of twisted disonant sound, words fail me in my futile atempts to describe this style of music, perhaps "ambient" would perhaps be the closest for those of you who are familiar with term.

Anyway, regardless of terminology, this music instantly brings back all the good times, memories, you name it, it´s such a hard thing to acuratly describe, and it is very much a state of mind requirement (not to mention higly subjective) if one is to absorb it fully, as with most if not all types of music.

My higest praise and recomendations is hereby served for this very uniqe type of music, i can not say that it resembles anything else i have ever heard, and that is rather rare this day in "eurovision song contest - mass produced cash is king way of making music" - age.
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Up north 
Sunday, March 9, 2008, 19:34
Posted by Anders
Another typical monday morning, but with a twist, the phone rings and it's our testing crew that needs us at Volvo JPG (Jokkmokk Proving Grounds) to verify some stuff on the new car (XC60), so we decided to go up there and it was not the Grey-Dark windy cold north i tought it would be at all...

The sun was shining and the temperature got up to -10degC at times.

We also caught sight of the local wildlife, on the road...

And took a shot of the sign indicating that we were passing the arctic circle.

It was a very nice trip, not planned but nice, we made the decision to go up to Jokkmokk 4 hours before take off from Landvetter but it sure was worth it.

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Monday, March 3, 2008, 16:08
Posted by Administrator
Här kommer lite bilder från Beijing, Kina. Det var kallt och blåsligt, men bra väder och bra luft (Beijing har vanligtvis mycket dålig luftkvalitet).

Först en typisk "The Great Wall" bild.

Sedan en bild fraan Tiananmen Square där förberedelserna för årets "Chinese People's Political Consultative Conference startade idag.
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flying all over the place 
Saturday, February 23, 2008, 13:17
Posted by Anders
I've been away on a small business trip to gent and oldenzaal and returned home yesterday, but not in the way i would have liked to...

This trip has been flawed with minor inconviniences, suprises and also some adventure like flying, all whielst trying to combat a cold that did'nt want to let go.

Starting out from Gothenburg - landvetter airport on tuseday we got a delay due to icy wings and poor landingconditions in brussels - zawentem airport thick groundsweeping fog.

Anyway i got there and it was a realy nice approach with almost no sight of the ground until we were on it, my guess is instrument landing, wery nice and smooth.

As i went to pick up my rental car, hopeing it still would be waiting for me, it was but only just the counter woman toöld me, the GPS was a mess to get working properly, i finaly made it come to life when i arrived at the hotel holyday in gent expo, thanks alot.

I got a bit to eat and the drove of tó visit the Volvo plant, a few "hellos" and "how are you's" acompanied by some meetings and i was on my way back again.

The following day was a full day in Gent plant production and then some more meetings, not too exiting but it sure was nice to see the place and some friends from back home and belgium.

The next morning at 03:00 a woke up got out of bed and prepared to go to a supplier review meeting in Odenzaal-holland some 4 hours drive from gent, it sure was a nice drive, especially past antwerpen were i managed to time the rush hours perfectly...

Later that same night i got back into the car to drive another 4 hours back, repeting my inpecable timing of the rush hours again, i'm really impressed with myself, needless to say i was a tad nackered as i got backsome 18 hours later...

Despite being a bit off i took a tour of gent before going back to the hotel, it really is a nice city, old buildings, nice church, and they had "spårvagnar" as well.

Come friday and it's time go back home again, no supprises along the way until we hit the swedish costline, then i got a bit exciting.

I noticed that the costline was pretty much white, hmmm, it's probably rather windy, and as it turned out i was spot on.

On the aproach breaking the clodcover the plane started to jump about a bit, as usual, but then it only got worse, so much infact that we abandoned the aproach approx 50m above the runway and broke the plane in the process...

With the engines reving up and down, going side to side and upp and down quite rapidly acomapnied by screams and nervous laughter the decent was aborted, this was for me the worst expirience in an aircraft but mind you i do not have all that much expirience to start with.

Anyway full throttle and back up we go again, more shakeing and swaying about place no information was addmitted by the captain until we were approx 15 min from Oslo.

After making a much smoother landing in Oslo we were informed that the approach was not within safe limits and that the something had happened with the flaps in the process so we were going to make a stop for repairs and refuelig before making a second atempt... in the same conditions... at this time some peaople started swearing quite loudly and tried to get out of the aircraft.

I dont blame them, it was not a nice expirience, and then stoping for repairs and go back in, thisproved a bit to much for some of us aparently.

Sometime later we made a second atempt with the repaired aircraft in the same conditions that broke it the first time, yes it was wery reasuring let me tell you...

Anyway same rollercoster ride again, this time the approach was wery fast, it seemed alot faster then usual and the landing was quite rough, or rather a real tough one i should say, again with not alot of expirience in these matters, i guess it was perfectly safe.

So i have now expanded my "list of visited places" with Norway, not having set my feet on the ground, does that still count ?

Business as usual for you guys probably, but quite an adventure for me, not realising it i probably took a bigger chance driving to Oldezaal and back.
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