Well, when we went to test them, they were shot… but for 10 Euros, I could have a cast aluminum box, and that? got to be a good start for a project, right?
A unique, super low coloration, ultra-dead, acoustic suspension project ;)
So:
They came home with me.
Let? have a look inside shall we?
Cute…
…but b0rked.
However after consultation with the lovely guys at Speakerland Oss http://www.speakerland.nl I returned with:
and a simple filter [bass:choke/treble:2nd order + series resistor]
Hmmm…
Hmmmmmmm…..no
Yes! But tricky. Need to chop the studs around the tweeter off and mod the bass driver.
So. Onto the build:
First, chop, sand and prep the cast aluminum cabinets:
(oh did I not mention the Hyster Yellow paintjob?)
Next lay your parts out and prep your equipment and tools:
I started by making templates for the 650g of ripple-finish lead for the cabs, including cutouts for the crossover and crossbrace (another mod I added)
Assemble crossovers:
Where? the bicycle angle I hear you ask? An iinnertube+double-sided tape cabinet seal:
Triple-check clearance and get medieval on it? ass:
(note precautions against getting filings in the driver, which has a vents BEHIND the spider, so bits could fall straight into the magnet gap)
Nice.
So, we need a seal here too:
(yes I trimmed the ends)
Yeah! It all fits!
Now, add a little acoustic surface treatment ;)
(slightly tidied after this pic)
Some long-hair wool, about 25g/cab (smells good :) )
(NB terminal block used for XO phase testing, will remove/direct solder later)
Screw together, real tight. Check airtightness: Drivers take seconds to return after being depressed.
Place on the end of 100w and run-in. Note 1.75m TQWP sub for scale (not connected).
Add a little EQ (ball park at this point) as the horns are boosting these freqs.
(nb +12 is neutral for the VLC preamp)
ENJOY THE DIMINUTIVE BEAUTIES!
Listening:
Pros:
*Clarity
*Micro-dynamics
*Width of soundstage
*Power handling/volume output vs size
*Smooth bass rolloff with surprising depth
*Very little vocal coloration including on female voices
*Very tuneful bass
Cons:
*Strong peak around 3kHz
*Efficiency
*Listening position/toe-in very important
*Upper treble somewhat rolled-off
Next Steps:
May address the peak with an improved filter, or, in software.
Overall:
Built, hacked and repaired SB-F2 –> SF2 (my second handmade speaker)
My back hurts but a really fun way to spend 36hours ;)