Model from Dimensiva.com
Any inputs welcomed.
Nice. The aluminium knobs look very good. I think you could emphasise the speaker mesh a bitmore, at the moment it looks like an uninteresting flat black expanse.
Agreed. I think one thing you could do to improve it is use an interior HDRI rather than a studio one.
Really nice model. Shame to lose all the detail! Try some other HDRIs, adding some highlights or physical lights.
I agree with Josh, adding in a physical light via plane to get some targeted lights hitting the top of that vinyl (a bit hard to achieve with just HDRI alone) would take this to the next level!
Also some lighting to catch the speaker mesh detail as Will pointed out is going to help. Try scattering the light 'across' the surface of the mesh (light should be almost perpendicular to the mesh plane) so you'll catch highlights on the peaks and put the valleys in shadow.
Great start though!