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Guides
Long-form explainers on how audio gear works and how to choose it.
Car Speakers
DLS Iridium 6.3 Review: 6.5-Inch 3-Way Component Speaker System
A specification-based review of the DLS Iridium 6.3 three-way component set: verified specs, crossover layout, mounting sizes, amp matching and buying checks.
Oct 9, 2026
Car Amplifiers
Zed Audio Leviathan Review: Specs, Versions, Setup and Buying Advice
A research-based look at the six-channel Zed Audio Leviathan: how its three versions differ, what it asks of your electrical system and who it still suits.
Oct 9, 2026
Speaker Design
Fiberglass Enclosure Construction: Materials, Layers and Safe Build Steps
How to build a custom fiberglass subwoofer enclosure: layers, resin and catalyst, volume maths, a worked example, and the safety gear the resin requires.
Oct 9, 2026
Speaker Design
Speaker Crossover Design: Slopes, Phase and a Worked Example
How speaker crossovers split the signal between drivers: filter order, Linkwitz-Riley and Butterworth alignments, driver impedance, and a worked 2.5 kHz example.
Oct 9, 2026
Speaker Design
Isobaric Speaker Enclosures: Theory, Math and Design Guide
Isobaric speaker enclosures pair two drivers so one compound driver can achieve a target low-frequency alignment in roughly half the net box volume of a single driver.
Oct 8, 2026
Speaker Design
SPLmeter dBm2 Review: 150 dB Car Audio SPL Meter
The SPLmeter dBm2 is a legacy high-SPL car-audio meter. This review checks its documented controls, 150 dB scale, tuning uses, limits, and alternatives.
Oct 8, 2026
Car Navigation
Eclipse AVN5495 Review: HDD Navigation, Features, Installation, and Legacy Value
The Eclipse AVN5495 is a 2005 double-DIN navigation receiver with a 30GB HDD, 6.5-inch touch display, DVD/CD playback and 5V preouts. This review covers its limits today.
Oct 8, 2026
Car Head Units
Kenwood EZ700SR Review: Specs, Features and Buying Notes
A specification-based look at the Kenwood EZ700SR CD receiver: 22 W RMS amp, 2 V preouts, Sirius tuner, MP3/WMA playback, and what to check before buying one used.
Oct 8, 2026
Car Head Units
Pioneer DEH-P7700MP Review: Is This OEL Head Unit Still Worth Buying?
A look back at the Pioneer DEH-P7700MP: its MOSFET50 amp, OEL display, Easy EQ and three preouts, and whether it still makes sense in a car today.
Oct 8, 2026
Car Navigation
Eclipse AVN2454 Review: Specs, Wiring and Installation Notes
A specification and research review of the Eclipse AVN2454, a mid-2000s 2-DIN DVD navigation head unit: verified wiring, GPS and install notes, plus limits.
Oct 8, 2026
Car Speakers
Memphis M1104 Review: 10-Inch M1 Subwoofer Specs and Setup
A specification-based review of the Memphis M1104 10-inch subwoofer: 300 W RMS, dual 4 ohm wiring, amp matching, gain setting and the specs that could not be verified.
Oct 8, 2026
Car Speakers
Crystal SSX 615 Review: Bridge-Tweeter Component Speaker System
A research-based review of the Crystal SSX 615 component speakers: what is verified, what is not, how the bridge tweeter works and how to set them up safely.
Oct 8, 2026
Car Amplifiers
Alpine MRP-M350 Review: Compact 200 W Mono Subwoofer Amplifier
A specification-based review of the Alpine MRP-M350 mono subwoofer amplifier: rated power, filters, wiring, subwoofer matching, limits and who it still suits.
Oct 8, 2026
Car Amplifiers
JL Audio e6450 Review: Six-Channel Class AB Car Amplifier
A research-based review of the JL Audio e6450 six-channel car amplifier: verified specs, bridging, filters, wiring, gain setting and who should still consider one.
Oct 8, 2026
Car Amplifiers
Lanzar OPTI4000D Review: Specs, Wiring and Power Limits
A specification-based review of the Lanzar OPTI4000D monoblock: rated power at 4, 2 and 1 ohm, current draw, wire size, gain setting and what to check before buying.
Oct 8, 2026
Speaker Design
Aperiodic Speaker Enclosures: How They Work and How to Build One
How an aperiodic speaker enclosure works, what the resistive vent or membrane does, how it compares with sealed and ported boxes, and how to build and tune one.
Oct 8, 2026
Speaker Design
Infinite Baffle Speakers: How They Work and How to Set One Up
How an infinite baffle speaker works, what driver and rear volume it needs, how to set one up in a car or a room, and how it compares with sealed and ported boxes.
Oct 5, 2026
Speaker Design
Speaker Enclosure Design: How Sealed, Ported and Other Boxes Work
How speaker enclosures actually work: sealed, ported, infinite baffle and bandpass boxes compared, with Thiele/Small basics, worked volume and port examples, and practical build advice.
Oct 5, 2026
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