Push-pull, Band-pass & Horn Loading



The next level of the lower frequency approach. 

The Loud Professional Push Loop Technology represents a step forward in the lower frequency response compared to the traditional direct radiating vented box. Based on the Push-pull loading technique, this special compound design combines three different techniques: Push-pull, Band-pass, and Horn Loading system, All-in-one!
It provides an exceptional low frequency extension down to 22 Hz, along with the better sound definition, reducing three times the total harmonic distortion in a really compact enclosure no larger than a typical single 21in. subwoofer system.
The pair of 21in. transducers, in a cone-to-magnet isobaric configuration, act like a single driver doubling the power handling (3000 + 3000 Watts Program) with a much larger motor resulting in more control of the woofer linear excursion.
They also provide lower frequency response compared to a single 21in. Vented design.
Same time the Band-pass system produces significant benefits in terms of high efficiency and deepest bass extension that would not be possible in conventional designs of equal size.
The Band-pass also allows a greater control over cone motion and upper low end region, even significantly reducing the total harmonic distortion (THD).
The third technique applied, the Horn Loading system, combines the above mentioned effects with the high system efficiency in terms of a greater wavefront output (SPL), giving a sensitivity of 106 dB.
Very impressive low frequency extension, for a massive sound impact, can be produced from the extremely compact F221 enclosure. All-in-one for a unique subwoofer system as you never heard before.

1.PUSH - PULL -  Cone - to - Magnet isobaric chambers    

The benefits

Much larger motor

Deepest bass extension

Greater control over cone motion

THD Reduction

Increased total Power Handling




The benefits

Bandwidth flat response

Increased System Efficiency

Greater control over cone motion

THD Reduction

More easily controlled emission

Excellent transducer protection





2.Band-pass - Dual 21.in double vented enclosure

3.Horn Loaded - Front Horn Loading system



The benefits

High Wavefront output

Exceptional sound impact

Incomparable punch-bass

Fast & prompt transient response 

Greater control over cone motion

THD Reduction

More easily controlled emission


Push Loop Technology aspects

Power_is_nothing_without_control Sound_never_ends

Get in touch

Loud Pro S.r.l.

Via Sebino, 29 - 00198 Rome - Italy

Phone & Fax: +39 (06)

Mail box: crew@loudprofessional.com

Mail box: marketing@loudprofessional.com


Rental & Where to buy