Jad Freer Toppar

SISMA Hybrid Tube/Class G Bass Head



Tube preamp based on the iconic B15 sound, studio grade D.I.and Fx Loop, proprietaryt ransistor analog class G power section with high quality switching power supply.


700W @ 4Ohm / 350W @ 8Ohm / 950w @2Ohm

Only3,9Kg – 8.5 lbs. / 25 × 28.5 × 6 cm – 9.8”x 11,2”x 2,3” inch


After many years spent building custom amps, SISMAis the first official bass amp release by Jad Freer Audio.


Vintage meets modern: SISMA aims to combine the qualities of aclassic tube preampwith the punchy and detailed sound reproduction of a bigtransistor power sectionmaintaining aportabilityprerogative, until now, only of class D technology.


Despite itssmall footprintSISMA is not based on a class D power section, but actually shares the sametransistor technologyof ourCODA power amp,delivering big and authoritative sounds capable to shake the bigger stages without any efforts and headroom to spare.


Build andhand-assembledone by one in Italy, the preamp is based on theiconic B15 sound, modded to our taste.


The tube preamp circuit is fed @ 200v by a proprietaryswitching power supplycapable to deliver high amounts of current, much faster than a traditional transformer-based one. Same technology is used in ourproprietary Class Ghigh-performance power-amp module, reducing weight and dimensions a lot with no sound compromise.


SISMA is the first official bass amp released by Jad Freer Audio which aim to combine the qualities of a classic tube preamp with the punchy and detailed sound reproduction of a big transistor power section maintaining a portability prerogative, until now, only of class D technology.


  • Tube preamp based on theiconic B15sound
  • Proprietary transistoranalog class Gpower section with high quality switching power supply.
  • 700W @ 4Ohm / 350W @ 8Ohm / 950w @2Ohm in only 3,9 Kg – 8.5 lbs.
  • Build and hand-assembled one by one in Italy.


Dimensions:  25 × 28,5 × 6 cm

Weight without box: 3,9 Kg

Power Amplifier: high-efficiency TRANSISTOR class G

Power Rating: 350w @ 8Ohm / 700w @ 4Ohm / 950w @2Ohm

Power Supply:  115/230 VAC selectable – WORLDWIDE USE

Configuration: rack-mount, solo-head, padded-bag


Läs mer på:

https://jadfreeraudio.com/product/sisma-hybrid-bass-head/



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