User manual FOCAL POLYGLASS SUBWOOFERS

[. . . ] For the 27 V2, 33 V2 and 40 V2, these all use a double coil system, thus have 2 x 2 input terminals incorporated. These subwoofers can be mounted in the traditional sense with the membrane on view externally, or inverted mounting with the motor unit and its chrome back plate on display. inverted mounting helps increasing the volume for the given space available. When choosing inverted mounting the phase must be inverted (thus swap the positive / to negative connections) so that the polarity is correctly observed. [. . . ] A frequency of 80Hz is a good compromise for effective bass compared to listening quality. Installing the subwoofer into an enclosure The new Polyglass subwoofers have been designed to work in sealed box enclosures. This system of charge, (easy and convenient for most installations), allows the user to experience a more dynamic extreme bass (12 dB/oct), with the added bonus of easier integration into the rest of the system. see pages 6 , 7 and 8 regarding our proposals for the various volumes available per subwoofer. Building an enclosure The construction should always remain strong and rigid, to eliminate any unwanted resonances. A good material such as MDF (Medium Density Fibreboard) will effectively ensure this is possible. Choosing the correct thickness of MDF compared to the surface area decided, is also critical to ensure the enclosure does not vibrate. for this reason the general thickness recommended is 19mm MDF. Any loose components such as the internal connections and cables should always be fixed securely inside. Damping material (foam etc) covering all the internal walls of the enclosure, will further ensure it is free from unwanted resonances. It is imperative that your custom designed subwoofer enclosure remains securely mounted at all times to the vehicle. Calculating the internal volume "Free air" installation The 40 V2 has also been designed to work in "free air" installations, for example into the rear parcel shelf. With this type of acoustic charge the subwoofer can work to an optimum level without a huge loss in performance. for such installations it is important to observe these following rules: · If mounted into the rear parcel shelf it must be strong enough to support such a heavy mass of subwoofer. Thus for this reason it is quite likely that the parcel shelf may have to be reinforced with wooden bracing. Alternatively a custom designed rear parcel shelf made from thick MDF, can be designed to replace the existing one. ⷠIf a weak shelf is used, the acoustic performance of the subwoofer will be dramatically reduced. A weak shelf that emits loud vibrations can in effect create an acoustic short circuit. Recommended power ratings Polyglass subwoofers are already highly efficient, with improved sensitivity. Therefore, their use with amplifiers will produce comfortable listening pleasure. [. . . ] For the validation of the Focal guarantee, send back this sheet within 10 days to the following address: At home, do you own Hi-Fi loudspeakers?If yes, specify the brand: Do you read the press?Your audio/video equipment (brands and models) before the acquisition of Focal products: Your choice for the purchase of this Focal model was made according to: - Dealer`s advice - Visiting an exhibition/a show - Sound quality/listening room - Reliability/manufacturing quality - Design/Finish - Article in the press (if yes, specify the title of the - Friend's or family's advice - Quality-price ratio - Already own Focal products - Catalogues - French product - Other : Model: Dealer's name: Date of your purchase: Serial number: City: Price of your purchase: Did you leave the product installation to your dealer's care?This information is necessary to our company to deal with your request. [. . . ]