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The Monoprice Monolith B4 is a compact two-way bookshelf speaker with a 4-inch woofer and a waveguide-loaded tweeter in a small MDF cabinet. It is rated 4 ohms, 85dB sensitivity and 40-130 watts, so it needs a decent amp but fits tight spaces. At $66.99 at eBay as of November 4, 2026, the best new price sits at the low end of what this speaker has recently cost.
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Lowest price we've seen: $66.99 on Nov 4 at eBay. Tracked across 4 stores since Nov 4.
Owner discussion of the Monolith B4 is thin, but Monoprice Monolith speakers generally draw praise for value and build and criticism for limited low end and finish quality.