{"product_id":"jadfreer-sisma","title":"Jad \u0026 Freer Audio SISMA Hybrid Tube \u0026 Class-G Bass Amp Head Made in Italy PRE-ORDER","description":"\u003ciframe width=\"1018\" height=\"573\" src=\"https:\/\/www.youtube.com\/embed\/AEjBgsCb74Q\" title=\"Jad Freer Audio - SISMA - Hybrid Tube \/ Class-G Bass Head\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen\u003e\u003c\/iframe\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003ch3\u003eTHE GAME CHANGER: A must-have for any gigging musicians\u003c\/h3\u003e\n\u003cp\u003eAfter many years spent building custom amps, \u003cstrong\u003eSISMA\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis the first official bass amp release by Jad Freer Audio.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eVintage meets modern\u003c\/em\u003e: SISMA aims to combine the qualities of a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eclassic tube preamp\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith the punchy and detailed sound reproduction of a big\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003etransistor power section\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emaintaining a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eportability\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprerogative, until now, only of class D technology.\u003c\/p\u003e\n\u003cp\u003eDespite its\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003esmall footprint\u003c\/strong\u003e SISMA is not based on a class D power section, but actually shares the same\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003etransistor technology\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eof our\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCODA power amp,\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edelivering big and authoritative sounds capable to shake the bigger stages without any efforts and headroom to spare.\u003c\/p\u003e\n\u003cp\u003eBuild and\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ehand-assembled\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eone by one in Italy, the preamp is based on the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eiconic B15 sound\u003c\/strong\u003e, modded to our taste.\u003c\/p\u003e\n\u003cp\u003eThe tube preamp circuit is fed @ 200v by a proprietary\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eswitching power supply\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecapable to deliver high amounts of current, much faster than a traditional transformer-based one. Same technology is used in our\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eproprietary Class G\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003ehigh-performance power-amp module, reducing weight and dimensions a lot with no sound compromise.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe result is the big, open and musical sound of a tube amp with much more responsiveness ad detailed sound reproduction and, of course, a lot more headroom. All this in a small fraction of traditional weight and dimensions, overall making this amp a real game-changer in today’s market offer.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSPECS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 25 × 28.5 × 6 cm – 9.8”x 11,2”x 2,3” inch\u003c\/li\u003e\n\u003cli\u003eWeight: 3,7 Kg – 8.2 lbs.\u003c\/li\u003e\n\u003cli\u003ePower rating: 350W @ 8Ohm \/ 700W @ 4Ohm \/ 950w @2Ohm\u003c\/li\u003e\n\u003cli\u003e2x Speakon-combo speaker output\u003c\/li\u003e\n\u003cli\u003e230\/115 VAC selectable power supply: WORLDWIDE USE\u003c\/li\u003e\n\u003cli\u003eFX Loop\u003c\/li\u003e\n\u003cli\u003eHeadphone out\/Aux in\u003c\/li\u003e\n\u003cli\u003eHand-made padded bag included\u003c\/li\u003e\n\u003cli\u003eRack mount system available as optional\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe core of the power section consists in a \u003cstrong\u003ecustom\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eheat dissipation\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003esystem\u003c\/strong\u003e, a heavily\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eoversized power supply,\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eand many custom components much superior in specs and performances to the corresponding off-the-shelf available ones.\u003c\/p\u003e\n\u003cp\u003eIn aid of the proprietary heatsink it has been engineered an\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eintelligent forced ventilations system\u003c\/strong\u003e, that, following the signal dynamics, allows the amp to work flawlessly in safety, never getting hot and performing\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003edead silent\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eat low volumes or studio applications.\u003c\/p\u003e\n\u003cp\u003eAnother great benefit of a well filtered and engineered switching power supply is that it doesn’t generate magnetic fields in the audible bandwidth, unlike the old toroidal PSU that suffer a lot of 50 \/ 60Hz hum. This allows SISMA to perform with\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eno audible interferences\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith other devices or pickups, even single coil ones.\u003c\/p\u003e\n\u003cp\u003eThe classic, passive two band \u003cstrong\u003ebaxandall tone stack\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis combined with two\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eactive semi-parametric eq\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esections, tailored after classic studio channels eq, to maximize flexibility, while a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003estudio grade D.I.\u003c\/strong\u003e,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eFX loop\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand Class A transistor \u003cstrong\u003eheadphones amp\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecomplete the connection options.\u003c\/p\u003e\n\u003cp\u003eUnlike most amplifiers on the market, preamp and power amp in the SISMA don’t share the same power supply, which means that in remote cases of power amp fails or overheats, the D.I. out will continue to work as usual letting the user to finish the performance through the P.A.\u003c\/p\u003e\n\u003cp\u003eSafety and durability are two aspects that Jad Freer Audio has always a great attention to: SISMA as all other our product has many internal protection systems that isolate any small problem letting you finish your performance flawlessly shutting down the device only before any critical damage will happen eliminating any risk for the connected equipment.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCONTROLS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eHigh impedance\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eInput\u003c\/strong\u003e\u003c\/em\u003e: the first stage of the tube has an input impedance of 2,2M Ohm, letting the amp reproduce every little detail of your instrument even with low output piezo pickups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eBass\/High\u003c\/strong\u003e\u003c\/em\u003e: baxandall, tube driven. These controls are very broad and musical, how they affect the sound is, in our opinion, one of the aspect that make SISMA special in the modern amp market.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eTwo band\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003esemiparametric eq\u003c\/strong\u003e\u003c\/em\u003e: active section after the tube stages, with Q and gain tailored differently for each band, in order to guarantee the most effective and musical response both in live and studio applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eGain\u003c\/strong\u003e:\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eit controls the second stage of the tube. We wanted an amplifier with lots of headroom but where the gain has great impact to the overall sound texture. So, depending on the instrument output, the sound will remain clean till 12\/13 o’clock, becoming bigger and beefier and gradually more compressed going up. After 13 o’clock the sound starts to break into a very warm, musical and dynamic overdrive resulting in mild distortion territory when the control is dimed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eMaster\u003c\/strong\u003e\u003c\/em\u003e: despite it’s compact dimensions, SISMA is a very powerful amp. We have set the master in order to be able to play also at low volumes, unlike many amps that at give 90% of their volume before 9 o’clock.  The potentiometer has in fact a logarithmic curve, so the volume increase is gradual and continues till the pot is on full.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eLPF\u003c\/strong\u003e\u003c\/em\u003e: active filter carefully tailored to soften treble response placed at the preamp’s signal chain. Very useful using cabs with tweeters or to achieve a good D.I. sound while cranking the gain of the SISMA or using dirt boxes that sound harsh going straight into the audio interface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eDeep\u003c\/strong\u003e\u003c\/em\u003e: active\u003cspan\u003e \u003c\/span\u003e\u003cem\u003elow-end boost\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eafter the tube stages that gives you more bottom without mudding your sound or altering your mid presence.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eMute\u003c\/strong\u003e\u003c\/em\u003e: mutes both power and D.I. out to allow\u003cspan\u003e \u003c\/span\u003e\u003cem\u003esilent tuning\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eor practice,\u003cspan\u003e \u003c\/span\u003e\u003cem\u003emonitoring\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eyour performance through the phones out.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eD.I. out\u003c\/strong\u003e\u003c\/em\u003e:\u003cspan\u003e \u003c\/span\u003e\u003cem\u003ePre Master\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003ebalanced output. It has\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eground\/lift\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cem\u003epad control\u003c\/em\u003e. We put a lot of effort to have a great D.I. sound: totally\u003cspan\u003e \u003c\/span\u003e\u003cem\u003enoise free\u003c\/em\u003e, big, punchy and articulate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eFX Loop\u003c\/strong\u003e\u003c\/em\u003e:\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eserial\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eeffects loop, completely\u003cspan\u003e \u003c\/span\u003e\u003cem\u003etransparent\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cem\u003enoise free\u003c\/em\u003e. Send can be used as an unbalanced output without interrupting the signal (LPF will not available on this out). Return can be used to bypass the preamp section and go straight into the SISMA power amp, even with your passive instrument.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eHeadphone out\/Aux in\u003c\/strong\u003e\u003c\/em\u003e: we paid a lot of attention for every part of the project, the headphone amplifier is another thing where we wanted to make a difference. This section is a full Class A transistor amplifier so powerful that can drive headphones of any impedance with no effort. All this force and power translate in a very big, punchy and controlled sound experience for the user. An auxiliary input completes the section allowing the user to silent practice or use the headphones for monitoring the performance of the band during a performance or recording session.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003e\u003cstrong\u003eLine Out\u003c\/strong\u003e\u003c\/em\u003e: it’s an unbalanced copy of the D.I. output signal. It can be used to combine the preamp section with another power amp in case you need it as a\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eslave unit\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eor simply to achieve a different sonic character. It can be used also as an\u003cspan\u003e \u003c\/span\u003e\u003cem\u003ealways on tuner out\u003c\/em\u003e, very convenient using SISMA in a rack mount system.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Jad \u0026 Freer Audio","offers":[{"title":"Default Title","offer_id":39895371907130,"sku":"JadFreer-Sisma-Amp","price":2328.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1764\/4443\/files\/jad-freer-audio-sisma-hybrid-tube-class-g-bass-amp-head-made-in-italy-pre-order-jadfreer-sisma-amp-gsus4-191133.jpg?v=1738758031","url":"https:\/\/gsus4.com.au\/en-us\/products\/jadfreer-sisma","provider":"Gsus4","version":"1.0","type":"link"}