Just before Christmas (December) is the worst time. Tax rebate months are the best (Feb -April)
Why is before Xmas worse? This is the time when folks are looser w/ cash flow..& are more willing to get that upgrade......Feb can go both ways, depending on the tax favor...I think the lull is Mar-May...spring when people get out more & spend less time on the computer due to dismall weather...but of course, those are my opinions, not factual statements, so please dont sue me.
Gear usually sells very slow just before Christmas as folks spend money on others and on gifts outside of audio. Peole are also busy with the events of the Holidays.
This is a general comment only based on my selling experience during the year. I usually hold off to after Christmas selling gear based on my past experiences. However if the price is right(lower than you want other months of the year) and the unit popular, it will sell.