At first sight subwoofer JetBalance JB-1 practically does not differ from younger model. In both sabah it is used on two dynamic heads, an aperture fazoinvertora it is deduced on the forward panel and even dimensions of cases are identical. However differences nevertheless are and mainly consist in an intensifying part. In the senior model the amplifier is collected on the basis of three microcircuits TDA 2030A, that allows to connect passive stereocolumns to a subwoofer. It is necessary to note, that in the industry of computer acoustics except for nobody lets out subwoofers as independent models. And the subwoofer with the additional amplifier for passive stereocolumns is very averatec 3225hs notebook interesting decision, considering an opportunity of connection to JB-1 inexpensive columns from world Hi-Fi. Externally differences JB-1 from younger model consist in the form of protective setok on dinamikah and higher rubber legs. Acoustic registration of a subwoofer is the scheme with fazoinvertorom. The port fazoinvertora is deduced on the forward panel. The case saba is made from fibrolita, thickness stenok is equal to millimeters. Dimensions of a subwoofer make centimeters. Dynamic heads applied in a subwoofer absolutely identical. Them diffuzory' are deduced on lateral panels and from mechanical damages are closed by metal lattices. Diffuzor dynamics it is executed from a paper and its diameter makes centimeters. Podves it is made of the made foam polymer. Inside of the case the panel dividing space averatec 3225hs notebook on two equal chambers is stipulated. The panel also serves rasporkoy, preventing parasitic vibrations stenok cases at greater levels of loudness. In that part where are located dynamics, the space is filled by a sound-proof material. SH-obrazny'y the transformer and a payment with elements on the other hand settles down. As intensifying microcircuits the manufacturer uses three monomicrocircuits TDA 2030A from. Two of them are stipulated for strengthening a signal on columns. Let's look at schedules of dependence of distortions from the capacity, taken of the specification on a microcircuit (for a pressure of a feed 36V): From the resulted schedules follows, that averatec 3225hs notebook TDA2030A develops capacity up to Vt at rather small amount of distortions. Not looking that is used three intensifying microcircuits, edges of a radiator on the back panel are not present. As a radiator the panel made of metal acts. On the back party of a subwoofer are located: a regulator of the general loudness (VOLUME); a regulator of loudness separately a subwoofer (BASS); a linear input (INPUT); a through linear input, for connection of active stereocolumns (OUTPUT); spring clips, for connection of passive stereocolumns (TO SPK); the switch with the indicator of a feed (POWER); the socket of a feed 2 In (POWER OUTPUT). We shall pass to measurements in, spent by means of a professional sound card and measuring microphone Behringer ECM 8000. Let's look at schedule ACHH of tested columns received by reproduction by tested system logarifmicheski of the accrueing sine (swept sine). Schedule ACHH of subwoofer averatec 3225hs notebook JetBalance JB-1 measured on an axis dynamics By measured schedule ACHH of a subwoofer, a working range of reproduced frequencies NCH-dinamika makes - 2 Hz. Schedule ACHH of subwoofer JetBalance JB-1 measured before an aperture fazoinvertora Fazoinvertor enriches sounding by low frequencies, beginning already about Hz! We shall pay attention that in JB-1 is used dinamik with a diameter diffuzora only centimeters. However due to correct calculations the manufacturer managed to reach such remarkable results. Spectrograms of harmonious distortions (2+ harmonics) subwoofer JetBalance JB-160, Measured on an axis dynamics On the measured spectrograms of distortions it is possible to see low enough level of distortions which are at worst not exceeding- dB ( %). For the class of acoustics averatec 3225hs notebook it is possible to consider such parameters good result. Sounding At subjective testing the subwoofer was connected to a professional sound card. The manufacturer completes a subwoofer with two wires for connection: a stereo mini-djek on stereo RCA and stereo RCA on stereo RCA. The length of wires makes meter and meters accordingly. At testing the subwoofer was connected to stereocolumns. At inclusion of a feed from dinamikov a subwoofer characteristic quiet low-frequency click is distributed. It is important, that at connection of passive columns from dinamikov columns of a rumble and network noise are not present. Sounding of subwoofer JetBalance JB-1 as a whole good. The subwoofer improves sounding stereocolumns by low frequencies, doing sounding more high-grade and comfortable. As well as the younger model, subwoofer JB-1 reproduces frequencies down to 2 Hz. Therefore to the columns having defective mid-frequency heads, the subwoofer will help averatec 3225hs notebook with reproduction of the bottom part of average frequencies. And at work of a subwoofer with stereocolumns of level JB-3 where average frequencies more high-grade also sound more brightly, in sounding saba these frequencies are not listened. Also it is necessary to understand, that subwoofers of class JB-1 are not calculated sodrogat' a floor at scoring paths to DVD-fil'mam. More likely, true positioning will be use JB-1 with stereocolumns for more comfortable listening music. Pluss the first in own way similar decision; a through linear input; presence of the switched socket of a feed; two dynamics. Minuses click at inclusion; controls are located on the averatec 3225hs notebook back panel. On subwoofer JetBalance JB-1 makes in Russia the company) It is published on June, 1st, 20 Other discussions in conference: Comments? Amendments? Additions?

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