2x50W in back-loaded horn for 4x100 at home

4 small active speakers don't need a lot of power to ensure complete relaxation with music at home

3-inch full-range driver with back-loaded horn and built-in 2x50 W amplifier, which, when bridged, will give 100 from each speaker at home and will not be a terror for the neighbors.

The Japanese Fostex has legendary offerings with a back-loaded horn. Being one of the systems where sound radiated from the back of drivers is utilized to enhance bass, including bass-reflex and double bass-reflex types, back loaded horn type enclosures make the most efficient use of such back sound. Back-loaded horn system enclosures work in such a manner that, as bass comes out of a horn mounted on the back of a driver, the rest of sound spectrum, e.g. mid- and high-frequency ranges, is radiated directly from the driver. Enclosures of this system are highly efficient by actively utilizing sound output from drivers, and respond well to the subtlest componentsof music signals.

The Japanese are the most active with such projects and widely present their concepts and relevant descriptions. The design points for backloaded horn enclosure are the cubic capacity of an air chamber, the cross-sectional area of its throat, the horn flare rate, the horn length and the horn-opening area. Fold up the horn and crate it.

One of the things it is highly-efficient system. In other words, it has a high output sound pressure level; the backloaded horn system is an energy-efficient design. So it allows the driving by low-power amplifier, too. Low-power amplifier is good from the point of view of sensitive sound.

It plays the fine sounds because the driver diaphragm can move easily by backward opening of the speaker driver, like open back type cabinet. So, it plays the realistic sound with overwhelming high quality if its sound source is good, but that's not how it works if its sound source is poor. Therefore, you may have trouble finding a good sound source.

You might hate the backloaded horn sound, but everyone will be surprised at the difference between the sound of backloaded horn and others. Furthermore, you will never believe the magnificent bass, the powerful sound and the instantaneous force for small-diameter driver.

Fostex offers a DIY kit with a small back-loaded horn housing>>>

A loudspeaker from a 3D printer gives more possibilities

For listening to music from 4 channels, a tiny $1 bluetooth module is useless and there is no better alternative.

The power supply is external - plug for 220 V with transformer and appropriate electronics.This gives amplifier a 3 A 12V DC power supply to drive the electroacoustic transducer and it is not worth saving too much on VA here.

The advantage of the design is that there are no phase distortions that occur in the crossover when the music signal is separated.

Imperfections in the full range speaker can be corrected in the computer, where distortions in the music signal will be much smaller.

Optimal setting in free Korean software for playing music from recordings with 4 speakers in Microsoft's new setup for their placement

This is possible with the system driver for e.g. Taiwan's most popular audio processors on desktop PC motherboards

In music stores, the cheapest Fostex offer for 4 channels at home is the PM04.c >>>

However, these are not active speakers. This is an offer of an amplifier and a pair of traditional 2-way speakers.

They were active in the earlier PM04.d version, which was more expensive and is still on offer for the Japanese market

The most interesting version is no longer available. They had amplifiers operating in class AB. Basreflex opening in the front makes it easy to set up at home.

An individually configured BienSound PC will ensure optimal quality>