【ESB 4000 SERIES Separate 2-Way｜A speaker that lets you enjoy music comfortably with dense mid-bass/low-mid and natural highs】

The ESB 4000 SERIES Separate 2-Way is not a speaker designed merely to make sound louder; it’s for those who want to bring out the character and ambience of music clearly.

What becomes obvious when replacing the factory speakers is the definition of vocals, the thickness of instruments, and the push/punch of the mid-bass and low-mid range.
In particular, the 16cm mid-bass employs a long-fiber pulp cone with special processing. It’s a unit designed with an important balance between lightness and stiffness, while suppressing unnecessary ringing. It’s not the type that simply enlarges the bass—rather, it clearly draws the core of drums and bass, as well as the thickness of voices.

The 28mm soft dome tweeter handles the high frequencies. It features a polymer laminate applied to a silk-dome diaphragm, aiming to produce extended, well-proportioned highs without pushing hardness forward too much.
Even when the number of sound elements increases, it’s less likely to pierce your ears, giving it an impression that’s also easy to match for those who want to hear vocals and acoustic instruments naturally.

With speakers in this class, it’s not only the performance of the unit itself, but also which car they’re installed in, at which position, and on what kind of base that matters a great deal.
Depending on the condition of the door, how the baffle is built, the extent of deadening, the tweeter’s orientation, and the combination with DSP and an amplifier, the overall impression of the same speaker can change.

At Log On, rather than deciding only the product first, we make recommendations while looking at your vehicle’s factory system, your current complaints, the music you listen to often, and how far you want to develop it going forward.
The interesting part of separate speakers is that you can think through the setup not only in terms of “wanting it to be better than stock,” but also things like “wanting a sound that’s easier to listen to over the long term,” “wanting vocals pushed forward,” or “wanting more bass but without making it unnatural.”

ESB 4000 SERIES Separate 2-Way is a speaker that you should definitely give careful consideration if you’re seeking both the density and the delicacy of sound.
If you consider it including installation methods and tuning, I think the music you listen to every day inside your car will become noticeably more enjoyable. If you’re interested, let us hear about your current vehicle system and the sound you want, and we’ll think together about the best way to shape it.

■ Main Specifications / Specs

【Basic Information】
Product name: ESB 4000 SERIES Separate 2-Way
Brand: ESB Audio
Type: Separate 2-Way speaker

【Mid-bass】
Unit: 165mm paper cone
Diaphragm: Special processing / long-fiber pulp
Frequency response: 50Hz to 6.0kHz
Sensitivity: 89.5dB
Impedance: 4Ω
Maximum input: 300W
Minimum resonance frequency (Fs): 57.3Hz
Magnet: Y35 ferrite
Baffle cutout dimension: 143mm
Frame outer diameter: 165mm (main body)
Frame outer diameter: 170mm (with grille installed)
Mounting depth: 67mm
Connection terminals: Plus terminal 250 Faston / Minus terminal 250 Faston

【Tweeter】
Unit: 28mm soft dome tweeter
Diaphragm: Polymer laminate (Sonatex™) silk dome
Magnet: N-52 neodymium magnet
Voice coil: Vent voice coil made with copper-coated aluminum
Included mounts: CNC machined aluminum flush mount / resin flush mount / adapter mount / surface mount

Organized based on publicly available manufacturer information.