OK so I know this page
has lain doggo for a while and an update is required, well here it comes, as
the song says.
Those of you who are regular visitors to our site will have seen
a large number of new pages and a slow but perceptible increase in the
models and components offered. Some of the things we worked on over the last
12 months have been a bit of a challenge to the old grey matter, but at
last, most of the "i"'s and "t"'s have been dotted and crossed.
New to the fold are two Bass Bins the Bass-Mate and Bass-Man.
These both use 10" Peerless drivers, Bass-Mate being a closed box design
whilst Bass-Man resides in a reflex enclosure. The larger of the two,
Bass-Mate employs a dual driver format configured in an Isobaric
arrangement. So you're not sure what an Isobaric arrangement is eh? Well,
the bottom line is this, you get more huff and puff in a cabinet of only
half the volume of using two drivers separately. If you're lucky with the
design you can sometimes squeeze an extra half octave of low notes out of
the system too. The downside, there always is one, you've got to dig deeper
for funds.
The two models both use normal cabinet construction techniques and are
configured to employ electronic filters to restrict / shut-down the higher
frequencies. The amplifier and filters are combined into a single component
panel which is hermetically sealed, (well it's airtight anyway) into the
rear of the cabinet. The smaller of the two, Bass-Mate, drones down to
around 35Hz, whilst its bigger brother, the Bass-Man around town, mumbles on
down to around 23Hz. Just the thing to annoy the cat or the neighbours or
indeed both at once.
On a smaller scale, two other designs hit
the pages during the last year, a kit MTM arrangement using Seas 41/2" Mid
Bass units and tweeters and a custom built miniature cabinet of some 31/2L
again using Seas components. This particular design has superb presentation
for its size and is augmented / supported by its own colour matched stands.
Note this is not available as a kit.
Flipping back to the MTM. Well what's an MTM?? This is a
driver arrangement, first pioneered by Messrs J. D'Appolito, whereby the
tweeter struts its stuff between two mid-bass drive units, thereby reducing
/ equalising polar shifts, no, not polar bears.
By necessity for optimum driver matching, the mid-bass units
are often quite small and so need reasonable cone excursion to produce a
realistic bottom end.
The MTM is available as a full kit and is augmented by a
fully comprehensive pictorial assembly manual. Also included in the manual
are a full set of mechanical drawings, so if you want to hack wood, we give
you the info. If you have difficulties we're on the phone or can supply wood
kits as required.
As for components, the New Year should see a
further addition to the Components section with a range of UK manufactured,
value for money Polypropylene capacitors, initially covering the range 1u0
through to 4u7 in 12 discrete values. All rated at 250Vdc.
Also, hopefully following, will be a range of 5W Precision
power, Silicon coated wire wound resistors with Ayrton - Perry windings,
(well pretty low inductance anyway, and good for HF), toleranced at 2%.
Pre stock enquiries may be made in the usual way through our
email link.
So there you have it.
Have a good New Year from all at QTA
Systems.
Till next time........
