Here's the driver mounted
Workshop dimensions 7m X 7m.
Should give a room mode or two..
Then got my 2nd Najda and the spare Behringer Inuke amp down from the loft.
Wired up.
Bridge mode for the Inuke.
Fiddled with the settings..
This not only gives more peak power than the driver can handle in theory, but also puts stereo to mono.
The inputs are the same L+R from Najda DSP dac, but a 4 pole Neutrik Speakon plug is wired plus lead to 1+ on the plug, as usual, but instead of minus lead to 1- it goes to 2+ (the 2nd pole as it were).
Clever - hard to mess up.
Then plug in mic / phantom amp to laptop. Ditto WaveIO USB to laptop coax RCA to Najda.
Then fire up REW to measure.
Using the current Najda set up file for my system, modifying to suit the Lab12 tapped horn sub.
Remove the odd PEQ I use in the music loft with the 2 X 4.2m long 20Hz Tapped horns.
X/O setting the same 60Hz low pass.
Adjust the gain... measure, lots of this🙂
Add some PEQs (just as Hornresp showed I would require / predicted).
Measurements
Normal volume 1/3 smoothing
1/6 smoothing
Giving it more power!
Then I had a listen to just the rumbling bass.
I have a bass test playlist.
Here's Dark But Just A Game - Lana Del Ray, quick measurement, at -30dB and a long way from the sub.
Sounded suitably deep and rumbly😂 gobs of 30Hz as usual.
Some tracks registered at 28Hz and even 26Hz on some tracks.
Pleased with this..