JAMO 250, 550, 650 User Manual

Technical Description

Jamo SUB 250, 300, 550, 650

General Description

With this dedicated subwoofer line up from Jamo we wanted to achieve several
goals.
We wanted a subwoofer line up with the best ever performance per $ and we
wanted it to be able to match a variety of different speaker solutions on the
market, including Jamo of course.

Making a dedicated subwoofer line up, instead of making designated
subwoofers to a specific speaker series creates e few challenges.
One challenges being to create a design and performance capable of matching
basically all speakers in the marketplace.
The design should be modern and “independent”, yet discreet enough to
match both different speakers and different interiors.
Another challenge for the development team was to optimize every “link in the
chai” to achieve the best ever performance. We wanted a subwoofer line up
capable of achieving high sound pressure levels (SPL) without compromising
the sound quality. It is quite easy to make a subwoofer play loud – but it is a
challenge at the same time to maintain precision and musicality.
This turned out to require development of completely new drivers and new
amplifiers as well as a new approach to manufacturing the cabinets, since it was
clear very early in the development process that a new way of bass reflex
loading (Slotted Bass reflex Port) had to be invented in order to keep the
cabinets as compact as possible.

The Products

SUB 250
SUB 250 is the smallest subwoofer in the line up. But do not let this deceive you.

With an long-throwing 8” subwoofer driver
housed in a Slotted Bass reflex Port cabinet
together with an BASH amplifier capable of
delivering over 250 W peak power this
subwoofer is a really strong performer
capable of deliver bass down to 30 Hz (­6dB). The SUB 250 has a very flat frequency
response (see figure x) making it capable of
playing bass notes in a very convincing way
compared to many conventional bass reflex
subwoofers. (see picture 1).

Because of the flat
frequency response all the
way to 150Hz, SUB 250 is
the ideal match for small
satellite speakers, since it
allows you to integrate it
seamlessly without missing

Picture 1

the important middle bass
area. Many subwoofers fall of very drastically above 100Hz (or some even under,
see picture 2) making them very hard to integrate with small speakers. Of
course the SUB 250 is also well suited for use together with bookshelf or
floorstanding speakers when there is a need for additional low frequency

response.

SUB 300

The SUB 300 is equipped
with a 10” subwoofer
driver and a amplifier
capable of delivering 300

Picture 2

W of peak power. The
same Slotted Bass reflex

Ported construction is
used here as in the SUB 250. But
with more cabinet volume,
allowing for deeper tuning, more
power and a 10” driver this
subwoofer is capable of reaching
down to 28 Hz (- 6dB). Still with
musical fidelity and a flat
frequency response (see figure x).
The level control is placed on the
front of the subwoofer, elegantly
integrated in the design, with a soft blue light indicating the volume setting.

SUB 550

SUB 550 is the biggest subwoofer in the line up where we have incorporated
the Slotted Bass reflex Port solution.
With an amplifier capable of delivering over 550W peak power housed in the
biggest cabinet of the series, with the deepest tuning, this subwoofer is capable
of deliver ultra realistic performance at extremely high levels and still maintain
the musicality of the bass notes. The SUB 550 reaches down to impressive 26Hz.