Each guide starts from a constraint you already have — an impedance, a channel count, a spec line that does not mean what it appears to mean — and works out what the published specifications actually say about it. Each one states its sample, shows its arithmetic, and links every figure to the manufacturer source it came from.
The Receiver Spec That Decides Whether You Can Ever Upgrade
Two of fifteen current AV receivers cannot pass a single main-zone channel to an external amplifier, ever, and one of them costs more than a model that can.
Which AV Receivers Actually Publish a 4-Ohm Rating
Three receivers out of fifteen commit to a 4-ohm load, while fourteen of the eighteen speakers that publish a minimum impedance drop below 4 ohms.
Two Speakers, Both “87 dB”, Three Decibels Apart
Converting the published sensitivity of 26 loudspeakers to a common basis reverses the printed order on 22 of 300 possible comparisons.
Ranked shortlists
These rank by a figure we can compute, not by an opinion we do not have. Each is generated from the gear database, so every number carries its manufacturer source and every gap is shown as a gap.
Bookshelf Speakers Ranked by Comparable Sensitivity
Ten bookshelf speakers whose published figures use three different measurement conventions, put on one basis.
Floorstanding Speakers Ranked by Comparable Sensitivity
Thirteen floorstanding speakers, measured four different ways, converted to a single comparable figure.
AV Receivers Ranked by Main-Zone Pre-out Channels
Which of sixteen receivers can hand a channel to an external amplifier, and which can never do it at any price.