Radās iespēja notestēt vienu no lētākajiem aktīvajiem sabvūferiem, kas pieejami Latvijā. Bez liekvārdības arī ķeramies pie lietas.
Ražotājvalsts, protams, ir Ķīna. Konkrētais modelis noteikti ir sastopams arī ar citu zīmolu, tikai atšķirība ir tāda šoreiz, ka konkrētā modeļa pasūtītājs aktīvi piedalās šī produkta (un citu) uzlabošanā, jo nodrošina tiem reālu servisu Latvijā, ne tikai pliku tirgošanu bez atbildības.
Sabvūferam pielietots fāzu invertora akustiskais noformējums. Vienā galā iestiprināts skaļrunis, otrā galā fāzu invertora caurule un pastiprinātājs. Ārpusē, protams, ir vadības pogas (ieejas līmeņa regulators un zemfrekvenču filtra regulators) un pievienojuma spailes, kā arī drošinātājs. Pievienojuma spailes ir mazas, izvietotas visas vienā rindā, gan augstajām ieejām gan barošanai un ieslēgšanas vadībai, bet apzīmējumi ir skaidri un tur neko nevajadzētu sajaukt. Varētu teikt, ka spailes barošanai varēja arī būt lielākas, bet, ņemot vērā nepieciešamo jaudu, tās ir pietiekošas.
Kaste izgatavota kombinējot MDF un skaidu palti. MDF pielietots liektajai virstamai. Tā ir salīdzinoši plāna, bet, tā kā tā ir liekta, tad nodrošina ievērojamu stiprību. Gala sienas ir no skaidu plates (~16mm). Visas šuves starp sienām kārtīgi nohermetizētas. Korpuss apvilkts, tiešām kvalitatīvi, ar pelēku tepiķaudumu. Skaļruņa difuzors aizsargāts ar resti. Tā gan stiprinās ar trīs skaviņām, un kaut kāda vibrācija būs neizbēgama, lai arī restes mala ir apvilkta ar gumijotu materiālu.
Pats skaļrunis ir ar vieglu difuzoru (papīra) un mīkstu piekari. Tas viss rezultātā dod sistēmai augstu jutību, rezultātā arī kopēju augstu atdevi. Augstā jutība nepieciešama tam, lai pēc iespējas labāk realizētu ne visai jaudīgā un vienkāršā pastiprinātāja potenciālu pēc iespējas labāk. Iebūvētais pastiprinātājs ir bez nekādiem barošanas pārveidotājiem. Kā jau minēju, tāds risinājums nenodrošina lielu jaudu, bet mazāk iespēju kaut kam saplīst, vai fona parādīšanos no augstfrekvences pārveidotāja. Normāla jauda panākta pielietojot divspoļu sabvūferu, kam uz katru spoli strādā pa diviem tranzistoriem (ja tā var teikt) tiltā. Sabvūfera grozs, protams, ir izpresēts no tērauda. Magnēta izmērs ir diezgan liels. Serde ir ventilējama.
Signālu uz sabvūferu var padot vai nu caur lineārajām ieejām (pietiek izmantot vienu), vai caur augstajām ieejām, ko ērti izmantot papildinot auto rūpnīcas audiosistēmu, kurai nav lineārās izejas no galvas aprāta.
Sākšu ar dažiem objektīvajiem mērījumiem. Ražotājs solīja LPF frekvenci 80-180Hz, nenorādot nogriešanas stāvumu. Priekš sabvūfera vairāk kā pietiekošs diapazons. Reāli gan iebūvētais filtrs praktiski maina tikai nogriešanas stāvumu, dalījuma frekvence mainās minimāli. Tā arī paliek ap šiem 80Hz. Pēc mērījumiem fāzu invertora regulējuma ir ap 60Hz, pie kura sanāk arī maksimālā atdeve un pacēlums uz AFR. Pa augstu priekš nopietnas mūzikas, priekš populārās pašā laikā. Pie tam, ar augstāku regulējuma frekvenci arī tiek panākta sabvūfera efektīvāka darbība. Jāsaka, ka efektivitāte priekš tā visa ir ievērojama, jo izdevās sava auto salonā izspiest 118dB maksimālo spiedienu. Katrā gadījumā AFR 6dB koridori satilpst starp 35 un 95Hz (mērot auto salonā), kas ir pat ļoti OK. Tas gan pie mazākās filtra frekvences. Pie augstākās regulējuma frekvences pīķis pat paceļas, ka rezultātā arī AFR pasliktinās līdz robežām no 45-100Hz.
Kā tad reāli skan. Pie zemākās regulējuma frekvences bass ir diezgan tīkams, it sevišķi uz disko mūzikas. Uz citiem stiliem sāk parādīties rūkoņa. Vispār neklausāms sabvūfers man šķita pie augstākās filtra regulējuma frekvences, tad tas vienkārši rūc, nevis atskaņot, to ko tam vajadzētu. Katrā gadījumā vajadzētu pielietota kādu ārējo aktīvo filtru, ar kuru varētu nogriezt arī zemāku dalījuma frekvenci, un vēl iestatīt sabsonik filtru. Šo variantu arī izmēģināju. Bass palika daudz patīkamāks, precīzāks. No rūkoņas vairs nebija ne vēsts.
Ja ir pieejami ārējie (no galvas utml.) regulējumi, tad sabvūfers var skanēt pat tīri labi. Katrā gadījumā nevajag aizmirst, ka par Kia Picanto cenu nevar nopirkt jaunu Mercedesu. Pie tam pielietojums šim sabvūferam varētu būt uz līzinga pirktam jaunam auto, kurā ir vēlme iedabūt nopietnāku basu. Pie tam, jaunajos auto šāds pasākums būs diezgan vienkāršs, jo tiem bagāžniekos mēdz būt 12V rozete, no kuras var paņemt barošanu. Faktiski šo variantu testējot es arī pielietoju.
tas subis ir 5cm garumaa vai kaa???? ja jau bildee, tad vissas plaknees! :)
2007-06-11 16:08:00 juriz rakstīja:
te lielā bile ar ir
vajadzēja jau kaut kādu 3D skatu, bet ...
2007-06-11 23:17:00 kevins rakstīja:
Nu ja uz 60Hz dod piikji Fi noformeejumaa auto salonaa uz max 118dB, tad man tur nekas ieveeriibas cieniigs gan neliekas...ja tu teiktu 128dB- tad es varbuut pashuupotu galvu:)))
2007-06-11 23:38:00 antonss rakstīja:
Prieks aktiva labs rezultats un ja vel nem vera ka barosana tika nemta no kautkadas ligzdas. ;)
2007-06-12 03:27:00 kiwi rakstīja:
pag ta shamais toch atspeelee arii 35Hz, -6dB?? nu tas nav slikti, un pa 70ls. Dereetu vairaak shaadus testus, tikai tad tev vinji visi jaatestee liidziigos apstaanjos (savaa mashiinaa). Un kaa tu meeriiji, tie cipari ir subjektiivi vai objektiivi?
Bet forsi, vairaak shaadus testus!
2007-06-12 09:26:00 juriz rakstīja:
Mērīts tikai ar tā saucamo trokšņmērītāju, aparāts, kas mēra spiedienu. Mērīts tika ar speciāliem signāliem ar noteiktām frekvencēm.
kevins - paskaties uz to pastiprinātāju, un tad padomā, ir 118dB daudz vai maz priekš tāda varianta.
2007-10-03 21:02:00 janchuks rakstīja:
tiko tadu iegadajos,tik biki pasmainiiju pashu subi no 400w uz 1300w pastuzis itka vel velk,nesmu elktrikis,bet itka viss strada..:)
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Hello...I've been following the progress (or lack of progress) with this tablet-google-search change over last few days... see earlier posts.It's annoying because I'm using an iPad. I too hate the change.I was searching for the news looking for media stories that relate to people not wanting the change and found an interesting link.Maybe Google doesn't want the "reverse reverse reverse" to happen because it wants to keep tablet users in neat little boxes for advertisers...text directly taken from a different google blog (details below)..."...tablet users can experience an optimized version of Google Search designed to maximize the screen real estate of a tablet...""... here are some ways in which you can make use of AdWords account features to review and manage tablet ad performance:....the ability to target tablet devices in Campaign Settings, offering greater control over specific tablet device types and the ability to target specific types of tablet users.""All campaigns targeting tablet devices will show on this new tablet-optimized search experience."Really... screen real estate?tablet ad performance?Do iPad users think we're going to get old google back now? when google ad revenue is at risk?It's also weird that with the link below, the "new google seach experience for tablets" is called "new google search ads experience"...notice the spelling of ads - as in adverts.Things to make you go hmmm... search for the google blog with these words.new google search ads experienceif the link disappears, I've taken iPad screen grabs.Not that i'm paranoid that this email will be "removed by author"Blackers travel credit card
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