Français page 7 Access Subwoofers Manual We congratulate you on purchasing a Focal subwoofer, from the Access range. This product has been designed using the very latest technologies available; to ensure the quality performance is to a very high standard. To gain the best results from your subwoofer, please ensure you follow these recommendations. If not followed correctly any fault observed, may not be covered by the guarantee. Cables For optimum performance the use of OFC cable (Oxygen Free Cable), to a sufficient thickness (2.5mm²) is highly recommended. This is particularly important in the case of long cable lengths being used in the installation. We recommend the use of Focal cables FC500 or FC700. Check with your local Focal dealer for further advice. Connecting up Always check the polarity to the subwoofer, and that of the other speakers used in your installation. The polarity is important to ensure the phase characteristics remain correct, otherwise a "loss" of performance can result. The spring action input terminals are clearly marked red spot = positive (+) and black spot = negative (-). 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. Multi-subwoofer installations To obtain a more powerful acoustic presence, we recommend the introduction of multiple subwoofers for your chosen installation. Using multiple subwoofers, various series or parallel or combinations of both can be used, but always check the specifications of the power source (amplifier) before attempting any installation. It is worth remembering if low impedance of 2 or even 1 ohm is chosen an amplifier of high quality should always be used for such installation. Connections in parallel Normally the terminal positive (+) on the subwoofer will be connected to the equally marked positive (+) on the amplifier, and the terminal negative (-) on the subwoofer to the equally marked negative (-) on the amplifier. The Focal guarantee only applies if the enclosed guarantee card is returned to us within 10 days of purchase. Focal- JMlab ® - BP 374 - 108, rue de l'Avenir - 42353 La Talaudière cedex - France - www.focal-fr.com Tel. (+33) 04 77 43 57 00 - Fax (+33) 04 77 43 57 04 Due to constant technological advances, Focal reserves its right to modify specifications without notice. Images may not conform exactly to specific product. 2 Access Subwoofers Manual Only on an inverted subwoofer installation is it normally necessary to invert the connections (-) and (+). Calculation of the impedance is (Z), for the given impedance value nominal (R), is 4 ohms. · 2 subwoofers : 1/Z = 1/R1 + 1/R2 1/Z = 1/4 + 1/4 Z= 2 · 3 subwoofers : 1/Z = 1/R1 + 1/R2 + 1/R3 Z = 1,33 Connections in series Using multiples of subwoofers for such comprehensive installations, it is sometimes better to connect them together in a series circuit. Using a low impedance load to the amplifier effectively ensures it will work less hard. For connecting the subwoofers, they are effectively looped together in any series circuit. Thus the positive (+) of 1st subwoofer will be connected to the positive (+) of the amplifier. The negative (-) of the 1st subwoofer will be connected to the positive (+) of the 2nd subwoofer. Then depending on how many subwoofers are to be included this looping will continue, until the last (in this basic case the 2nd subwoofer), will have its negative (-) connected to the negative (-) of the amplifier. Calculation of the impedance is (Z), for the given impedance value nominal (R), is 4 ohms. · 2 subwoofers : Z = R1 +R2 Z=4+4 Z=8 Connections series and parallel, combined Depending on your installation amplifier(s), subwoofer(s), various combinations of series and parallel circuits can be used. The real advantage of doing this is to have a system with available power, but at the same time to ensure the system impedance load is optimum for the amplifier(s) used. Connection diagrams Examples and configurations for various multiples of subwoofers: 2 subwoofers 21 V2 in parallel. Z = 2 3 subwoofers 21 V2 in parallel. Z = 1,33 3 Access Subwoofers Manual Adjustment of low cut off frequency The cut off frequency of a subwoofer is normally in the region of 60 to 100Hz. This is always dependent on the particular installation and listening position. A frequency of 80Hz is a good compromise for effective bass compared to listening quality. Enclosures Access subwoofer were developed for vented box only. This classic simple alignment usually give the best and most consistent results. See page 12 regarding our proposals for the various volumes available per subwoofer. Vented boxes A bass-reflex system is more efficient than the sealed box since some of the energy from the rear of the cone is converted via the reflex port to add in phase with the main output. There is also a reduction of cone travel at the tuning frequency, so this system can also give higher power handling. However, at very low frequencies bass rolls off faster (24dB/octave). In simple terms, bass is louder, but not quite as deep. You can make a vent port from a piece of plastic pipe, or there are many profiled vent custom designed for loudspeakers that minimize turbulence (prevents what's commonly referred to as chuffing). 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. Warning! The improved power handling has allowed Focal subwoofers to play at very loud sound volumes. For this reason, we recommend caution be wisely applied, especially during long listening periods. Excessive volume levels of more than 110dB can cause permanent hearing damage. 4 Access Subwoofers Manual Recommended power ratings Access subwoofers are already highly efficient, with improved sensitivity. Therefore, their use with amplifiers will produce comfortable listening pleasure. However used in a more high-end system, with more powerful amplification, the audio quality will be greatly improved. It is very important to check that rated power of the amplifier is suitable to the subwoofers. Otherwise they may distort, or possible damage could occur. Always consult the owners manual of the principal source (head unit/amplifier), to ensure the power rating is compatible. A safe guide is to ensure the maximum power of the amplifier is not greater than the nominal power of the speakers. Guarantee All Focal loudspeakers are covered by guarantee drawn up by the official Focal distributor in your country. Your distributor can provide all details concerning the conditions of guarantee. Guarantee cover extends at least to that granted by the legal guarantee in force in the country where the original purchase invoice was issued. Technical characteristics Impedance Nominal power handling Maximum power handling Sensitivity (2.83 V / 1m) Fitting diameter Mounting depth Parameters 25 A1 Sd Xmax Fs Qes Qms Qts Vas Re Mms Bl Le 339.79cm 5.5mm 40.61Hz 0.4 8.65 0.382 24.34 litres 3.35 Ohms 102.35g 14.79N/A 1.07mH 2 4 Ohms 200W 400W 92dB 9-1/8" (232mm) 4-1/16" (103mm) 4 Ohms 250W 500W 94dB 10-13/16" (275mm) 4-11/16" (119mm) 30 A1 510.71cm2 5.5mm 37.4Hz 0.45 6.37 0.42 52.97 litres 3.2 Ohms 125.24g 14.47N/A 1.04mH 5 Access Subwoofers Manual 25 A1 - Vented enclosure Frequency response SPL (dB) 1W/1m 20 litres (0.70 cu. ft) Fast and tight bass 25 litres (0.88 cu. ft) Punchy and dynamic bass (best compromise) 30 litres (1.06 cu. ft) Deep and articulate bass Frequency (Hz) 20l F-3 Fb Boostmax. 48Hz 53Hz 2.5dB/65Hz 25l 42Hz 46Hz 1dB/55Hz 30l 38Hz 46Hz - 35l 38Hz 43Hz 1.5dB/47Hz 40l 37Hz 42Hz 1.5dB/46Hz Calculating the internal volume Internal volume1 A B C D 25 A1 vents2 Internal volume calculation: Vb = B x C x {D+(A-D)/2} 20 l 300 11.81" 300 11.81" 410 16.14" 190 7.48" 9 x 27 3.5x10.6" (angled) 25 l 330 13" 330 13" 390 13.35" 210 8.27" 8x23 3.1x9" 30 l 370 14.57" 370 14.57" 380 14.96" 237 9.33" 8x25 3.1x9.8" 35 l 370 14.57" 370 14.57" 435 17.13" 237 9.33" 8 x 17 3.1x6.7" 40 l 370 14.57" 370 14.57" 490 19.29" 237 9.33" 8 x 15 3.1x5.9" 1 - External sizes in inches and millimetres with sides of 19 mm thickness 2 - (Ø x L) in cm 6 Access Subwoofers Manual 30 A1 - Vented enclosure Frequency response SPL (dB) 1W/1m 30 litres (1.06 cu. ft) Fast and tight bass 35 litres (1.24 cu. ft) Punchy and dynamic bass (best compromise) 40 litres (1.41 cu. ft) Deep and articulate bass Fréquence (Hz) 30l F-3 Fb Boostmax. 46Hz 47Hz 2dB/73Hz 35l 43Hz 42Hz 1dB/70Hz 40l 41Hz 37Hz - 50l 38Hz 42Hz 1.5dB/63Hz 60l 35Hz 39Hz 1dB/50Hz Calculating the internal volume Internal volume1 A B C D 30 A1 vents2 Internal volume calculation: Vb = B x C x {D+(A-D)/2} 30 l 370 14.57" 370 14.57" 380 14.96" 237 9.33" 8x17 3.1x6.7" 35 l 370 14.57" 370 14.57" 435 17.13" 237 9.33" 9x25 3.5x9.8" 40 l 370 14.57" 370 14.57" 490 19.29" 237 9.33" 10x35 3.9x13.8" (angled) 50 l 450 17.72" 440 17.32" 440 17.32" 260 10.24" 8 x 11 3.1x4.3" 60 l 450 17.72" 440 17.32" 530 20.87" 260 10.24" 8 x 11 3.1x4.3" 1 - External sizes in inches and millimetres with sides of 19 mm thickness 2 - (Ø x L) in cm 7 Notice Subwoofers Access Nous vous remercions d'avoir choisi votre subwoofer parmi la gamme Focal ; ce produit de haute technologie a été conçu pour assurer des performances musicales élevées, constantes dans le temps. Aussi, afin de garantir un fonctionnement optimal de votre subwoofer, nous vous recommandons de lire attentivement cette notice : tout problème résultant d'un non respect des règles d'utilisation peut entraîner l'invalidation de la garantie. Câblage Un câble de qualité OFC (cuivre pur désoxygéné) et d'une section suffisante (section minimale de 2,5 mm2) est vivement recommandé, particulièrement si la distance séparant le subwoofer de l'amplificateur est importante. Nous vous conseillons d'utiliser les câbles Focal FC 500 ou FC 700. Connexions Veillez à bien respecter les polarités lors du raccordement afin que le subwoofer et les autres haut-parleurs de l'installation fonctionnent parfaitement en phase. La borne matérialisée par un point rouge correspond au positif (+), celle repérée par un point noir correspond au négatif (-). Le subwoofer peut être installé dans un caisson avec le moteur à l'extérieur ; le volume de charge sera alors légèrement augmenté mais l'accord du caisson n'en sera que peu modifié. Cependant, il est impératif d'inverser les polarités du subwoofer afin qu'il reste en phase avec les autres haut-parleurs. Utilisation de plusieurs subwoofers Une pression acoustique plus importante sera obtenue en utilisant plusieurs subwoofers. Selon la complexité de l'installation, le raccordement des subwoofers sur l'(es) amplificateur(s) se fera de plusieurs manières : branchements en parallèle, en série ou à l'aide d'une combinaison de ces deux modes. Seul un amplificateur de qualité garantira un fonctionnement parfait sous une impédance de charge faible : 2 voire 1 . Le choix de l'amplificateur sera donc effectué en tenant compte des exigences de l'installation. Branchements en parallèle Relier les bornes positives (+) des subwoofers et raccorder sur la cosse positive de l'amplificateur. Procéder de même avec les bornes négatives (-) et brancher sur la cosse négative de l'amplificateur. Calcul de l'impédance (Z) en utilisant des subwoofers d'une impédance nominale (R) de 4 : · 2 subwoofers : 1/Z = 1/R1 + 1/R2 1/Z = 1/4 + 1/4 Z= 2 · 3 subwoofers : 1/Z = 1/R1 + 1/R2 + 1/R3 Z = 1,33 Pour validation de la garantie Focal, merci de nous retourner la garantie jointe dans les 10 jours. Focal- JMlab ® - BP 374 - 108, rue de l'Avenir - 42353 La Talaudière cedex - France - www.focal-fr.com Tél. (+33) 04 77 43 57 00 - Fax (+33) 04 77 37 65 87 Dans un but d'évolution, Focal-JMlab se réserve le droit de modifier les spécifications techniques de ses produits sans préavis. Images non contractuelles. ©Focal-JMlab 8 Notice Subwoofers Access Branchements en série Lorsque ...