Why do my reflexes sound so...honky?

Teunos wrote: Okay so please tell me i wont make another mistake here. But i just quickly plugged your numbers into bassbox pro Are you sure that graph you posted is tuned for 43Hz? If i insert 180L, 43Hz, 4 ports of 9800 mm^2 it should be 21.0cm long, but it gives me the yellow graph. If i insert 180L, 34Hz, 4 ports of 9800 mm^2 it should be 43.0cm long, but it gives me the red graph. The red graph is very similar to yours.

Ill have a go at this later and post up the results, I don't have any fancy equipment so its going to be pretty rudimentary.

It doesn´t need any fancy equipment, so to speak - two JACK 3,5mm connectors for your soundcards, a resistor (about 33-100Ohm) "crocs" to connect it to the speaker terminals, and free Arta software. If everything goes as should, setup would take 5 minutes, and there ya go... But of course, it might not be easy for everyone. One can even buy complete systems as Dayton (WT-3 I guess). If you do your own DIY boxes, it is well worth it.

dmr: for impedance measurements, yes! :-)

Little more signal would maybe help to straighten things up, but this is enaugh to make a picture of how it´s tuned. . It seems you have it tuned at 39-40Hz. That seems to be right. The problem with your enclosure is obviously elsewhere.

Now when you was able to do this, you could take the speaker out of the enclosure, carefully add (about 40g? of) weight to the speaker cone, and measure that one (while the first one set as overlay). Then it will count real TS parameters of your speaker. (menu item). It would provide you with better data for a simulation. If everything looks good even after all this, the problem could really be in the enclosure, or in the signal/power trace. The source, or the amplifier, or thin long cables etc. I remember well, when I used by 2 18"s bridged with QSC RMX 1850HD, using about 12+m long cables. It sounded like sh**z. Once I cut the wires to 2,8m lenght, the cone excursion went down, and the sound also tightened up!

Bracing is a bunch of triangles stuck to the corners midway down the panels - I'm gonna split each panel along its longest face and stick in a batten (running depthways) of something about 40mm high. Should be rigid enough?

Edited by dmr - 18 June 2016 at 9:21pm

For T-S parameters you need to measure first the driver in free air without added mass, and then with the added mass. Program calculates the parameters from the shift in resonance frequency with known mass. Not as accurate as some other options but gives you indications. Would be best done with constant current though.