So, received a response from Thomann via email:

Hallo.

Wir haben die Lautsprecher erhalten und getestet. Dazu haben
wir Sinus-Töne über die Lautsprecher geschickt. Wir haben alle
relevanten Möglichkeiten probiert; d.h. Monitore physikalisch und
auch per Audioausgang getauscht. Wir konnten keinen unterschied
messen, der einen Defekt eines Lautsprecher bestätigen würde.
Unabhängig davon hat auch unsere hausinterne Werkstatt die
Lautsprecher geprüft; ebenfalls ohne Feststellung eines Defekts.

In solchen Fällen ist in 99% davon auszugehen, dass die
Raumakustik das Klangbild formt. Haben Sie bei Ihrem Test
die Lautsprecher (physikalisch L->R bzw. R->L) getauscht?
Haben Sie auch den Ausgang ihrer Soundkarte bzw. Mischpultes o.ä.
getauscht?

Da es sich um einen Versandrückläufer handelt, können wir Ihnen anbieten,
die Lautsprecher an Klein&Hummel einzuschicken um sie dort vom
Hersteller einmessen zu lassen. Falls dies Ihren zeitlichen Rahmen übersteigt
können Sie auch gerne von Ihrer Money-Back-Garantie gebrauch machen und
sich das Geld zurück überweisen lassen.

Mit freundlichen Grüßen / with best regards

Daniel Oppl

Studio-/Synth-/Softwareabt.

Basically, what he’s saying is that they’ve tested them and can find no fault. I don’t believe a word he says since I trust my own ears and own tests absolutely. He tries to infer that they have carried out similar tests to mine and then tries to suggest that it may be my room acoustics. Well, I certainly sent a reply, which is as follows (English version for you guys!!):

Dear Daniel,

Firstly, thank you for your response, however contradictory it may be to mine. May I apologise for writing in English as up to this point it has been my wife constructing my words into German for me as my German is still not very good.

I tested these monitors in a few different ways, the first way only natural when plugging a new set of monitors in. I simply played some familiar mixes/songs through them. I noticed a discrepancy straight away so then I A/B’d them which made the difference stand out more. I then physically swapped them over, as you mention, from left to right and vice versa. After having done this, and the difference could still be heard, I simply monitored a CD player through my monitor controller to assure me that it wasn’t my sound card causing this problem. I then swapped the outputs of my monitor controller to also rule it out of the problem. Having done this, it was time for a more exact type of testing.

You say you sent sine waves through the speakers, as I did, and came to the conclusion that there was nothing wrong. Did you actually record the output in a close mic’d situation, or were you all rather standing around and listening for the differences??

Believe me when I say, I sent a sine wave through the monitors starting at 40Hz and increasing in semitone steps over 4 octaves. I close mic’d each speaker (using the same channel, the same cable, the same directional mic, in the same position) and came up with a very different bass frequency response from each speaker. Due to them being close mic’d, room acoustics played very little, if no part in the result. In any case, even if room acoustics did play a part in my test, I dare say my studio would acoustically compare rather favourably with your shop studio.

The fact of the matter is, that although both of these speakers are (independent of each other) in good working order, they DO NOT reproduce bass frequencies in the same manner as each other nor as any other matched pair of monitors do and should.

I have recently spoken to Just Music who have offered me a new pair of 0300′s for only a couple of hundred euro more and would therefore like to request a refund from you. I thank you for your time and bid you good day.

Regards,

Jordan Kerr

Anyway, that’s it, a hopeless company with a hopeless end. I will definitely be spreading the word on this one, It must just be a company full of amateurs who have no clue on what they’re doing and I would prefer not dealing with these type of firms.