Correct but I also queried the difference of inferior wood materials and standing waves.
Which makes sense to me being that at 45hz they are 7.6m (according to an online calculator). However, I cannot dispute a very obvious clarity difference between the two boxes. To me it sounded like a ringing similar to when you turn the ring modulation up on a subtractive synthesiser just a little on some frequencies in the cardboard box.
Thank you for the link. The plot thickens. I don't say MDF is the way to go because I'm sure part of the effect is due to a different box volume and mounting angle too, but I can say that it was clearly more to my satisfaction than the compressed cardboard eBay box.
I agree that different wood creates a different sound signature as I have been a classical guitarist spoilt with access to many different guitars through connections and the wood makes a significant difference to the resonance, sustain and attack of the sound.
Ok thread closed. 😉