The new I series has been considerably re-engineered from our plus series and although the physical styling is similar the construction and internal parts are quite different. This means that it is not possible to offer an “upgrade” path from existing +Plus Series to the new “I Series”. The new “I Series” consists of a new higher density medite™ carcass which has been remodelled internally to accept the new HF and LF drivers.
We are confident your loudspeakers will afford many years of trouble-free listening of the highest order. But in the unlikely event that one or more requires repair, our unique manufacturing procedure, wherein the precise value of each component together with the response of the system as a whole is recorded, will ensure that any replaced parts will exactly match the performance of those originally included within each individual loudspeaker.
In an ideal world the speaker would be decoupled from the room using a slab of dense material such as concrete or marble, which is in turn decoupled from the slab using spikes or bluetack. However, in the real world this is hard to achieve, and will have limited effect on the sound quality unless a considerable amount of money has been spent on the system and the room acoustics are good.
If you own a DB1, TB2 or an FB1, they can be upgraded to a DB1+, TB2+ and FB1+ standard respectively. This modification can be performed by a dealer or by PMC.
Customer DIY upgrades to PMC speakers are strongly discouraged as not only will this invalidate the warranty, it may very likely make your speakers sound worse. Designing PMC speakers takes skilled R&D engineers a great deal of time with the best equipment at their disposal taking all factors into account. Judiciously replacing components can upset the balance of a carefully designed speaker.
Because out unique ATL advanced transmission line enclosures, wide dispersion pattern, low harmonic distoring and smooth roll-off, PMC loudspeakers are more forgiving of difficult room conditions and placement constraints than conventional designs. However we encourage you to spend some time experimenting in your own room in order to obtain the best results within any applicable architectural influence upon system performance, especially in the low frequency region.
The following guidelines are suggestions for the initial location of you monitors.
PMC recommend using a high quality thick multi-strand Oxygen Free Copper (OFC) cable between the amplifier and speakers. The use of ‘exotic” cables has limited improvement on sound quality, so we would not advocate spending great quantities of money. However, if you are prepared to spend a great deal of money in this area, we would strongly advice you listen first to determine whether the outlay is worth the improvement.
They are expensive to build due to the labyrinth design within the cabinet and only a few speaker designers have a sufficient understanding in order to produce competent designs. Unfortunately there is no magic formula’s, as with sealed and ported designs.
Transmission line, ported and vented designs are three different concepts on how to load the bass driver in a speaker enclosure. Transmission lines and sealed boxes have a 12dB per octave roll off after the resonant frequency, while a vented box has a 24dB per octave roll off. Ported speaker are the most common as they are cheap to build and easy to design, though the quality of the bass reproduction is questionable in many designs and such a steep roll off can have knock on problems further up the frequency range.