Magazine and Site News

So... To happenings.

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. 

MTM D'Appolito Mini TL.

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.

Caps 'n' Things.

As for components, now available are 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.

Till next time, QTA Systems.