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Audison HV Sedici THK Owner's Manual

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caraudioguy2100

• 2020-07-08 6:22 am

Amp powers up and idles at 20 amps of current . Amp works besides the idle current is way to high . Any ideas on this ? Do I need to adjust the bias or idle current ?  

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Perry babin.

• 2020-07-08 6:36 am

That would be the first thing I'd try.  

• 2020-07-08 6:41 am

Do you know if the one in red or the one in blis is the bias adjustment? And on the 2nd pic is that pot for the idle adjustment?  

• 2020-07-08 6:50 am

I don't know but I'd suspect that it's the one nearest the bias transistor.  

• 2020-07-08 7:34 am

Thanks Perry , I adjusted the bias and amp idles perfectly now  

• 2020-07-08 7:43 am

This may be an amp that's designed to run at high bias. Were both channels causing precisely 1/2 of the overcurrent? I'd do some research on whether this is a high bias amp or not. The only reason that I'm suggesting it is because I know nothing about these amps. Ask the owner if the amp has run hot at idle for the entire time that he's owned it.  

• 2020-07-08 7:57 am

It’s supposed to idle at 2.6 amps as factory specs . It was idling at 10 amps . Only 1 channel was causing the bias issue other channel was fine I set them both the same but only 1 channel was Causing the issue . I tried adjusting them while watching the current draw if you set it fully counter clockwise the amp will draw excessive current so I set 1 channel and it took care of the issue then reset the other channel and it’s right about 2.5 amps of current draw per manufacturer specs  

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Rare audison sedici class a monster!!!!!

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Product Brand & Model: ison sedici Audison sedici Condition of all items: Good condition works perfect! Total Price: : 800 obo Shipping Terms: : 35 Pictures: - Unless you are a Upgraded member, or your last 10 iTrader feedbacks are positive, you must post a picture of the exact item you are selling. Additional info: Amazing power sounds amazing!!!!!! ** DO NOT DELETE ANYTHING BELOW THIS LINE OR THREAD WILL BE DELETED ** ------------------------------------------------------------------------------------------ Please be advised, all buyers and sellers are responsible for performing their own due diligence when considering any financial engagement. We recomend that you: 1) Check the iTrader feedback of the person you are dealing with on this site, as well as other car audio forums. 2) Ask for a name address and phone number. Call them and verify their info. 3) Valid e-mail address. Correspond before committing. 4) consider using an escrow service to protect yourself. DO NOT proceed with a deal until you are completely satisfied with the other party. DIYMobileAudio is not responsible for the outcome of any transaction on this site and will not moderate on your behalf.  

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Nice amp... I wonder why we don't see much Thesis stuff on here.. I have Thesis Due which I haven't seen much of here either. Wonder why that is? Sent from my iPhone using Tapatalk  

Do you have the wood top?  

What is the Tomahawk chip? Sent from my iPhone using Tapatalk  

It's a different pre amp chip they used in this amp. You can turn it on or off to run class a in this amp. These suckers run hot!  

This is what an intact excellent condition Sedici looks like with Tomahawk chip  

Really nice looking internals.. In my opinion good amps do run hot.. As long as they don't switch off. A competitor here won't let his car to be judged until his Voce Quattro amps are hot. When the amps are at operating temperature they sound there best. Most home audio amps run 24/7 to keep them hot as they won't play till they warm up and it can take time... Sent from my iPhone using Tapatalk  

Yes it never shuts off. I can only imagine how hot it would be at 2 ohms mono.  

If they give a spec for it then it's designed to do it.. But if you live in Dubai you may have a problem with 50deg heat.. But in normal temp areas it should be fine Sent from my iPhone using Tapatalk  

Actually no...the Sedici..HV16 had 4 fans designed to rUn on top of them..they look like computer fans..and the wooden strip held them in place. So it normally runs very very hot..even in Italy..and so they developed the Tomohawk chip..which they also use in the Trenta...I think. I have seen a few pics with the 4 fans running on the Sedici..big fans.  

Here is some performance data. GLWS. Audison HV Sedici  

Up taking offers or trades plus cash!  

I have a slew of trades. And, could machine a bitchin' new top cover.  

LOL..just clarifying Sent from my SM-N910T using Tapatalk  

He has LOTS of goodies...  

Bump for a great guy with awesome stuff ��  

Fantastic amp, unfortunately I have been told that there are no Tomahawk chips available for them any longer. But GLWS Sent from my XT1585 using Tapatalk  

And ......... sold!!!!!!!! Thanks guys!  

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Current page: Amplifiers measurement results A Audison Audison HV Sedici

provided by Likos1984 from the Hififorum

Rated power measured according to DIN 45500 up to 1% distortion factor in 13,5V

Audison HV Sedici

1 × 196 watts , channel 1 at 4 Ohm 2 × 196 watts , channel 1 + 2 at 4 Ohm

1 × 729 watts , channel 1 + 2 bridged at 4 Ohm

1-Ohm Betrieb nicht gemessen, wegen zu schwacher Stromversorgung (extern)

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BEYOND THE ABSOLUTE

In the Marche region, a geographical area world-famous for the production of esteemed musical instruments, Audison started its long history in the pursuit of audio preformance perfection.

THE GENESIS OF

As early as 1991 , HR 100 stood out as a benchmark , bringing the Audison brand into the Olympus of Hi-End manufacturers.

HR 100 was designed to obtain the highest sound quality without compromises . Its maximum power output was its only limitation, as technology of the time did not allow this reference sound quality with massive power. Four years later the THESIS brand was created. Using the latest technology, Audison once again rewrote history on amplifier performance. In 1995 and in 1996 respectively, HV sedici and HV trenta amplifiers came to light.

THESIS and HR 100 have a strongly distinctive sound , which could not be improved in its uniqueness, but one way to try was: to merge the two projects into a single amplifier, long-held in the dreams of Audison designers. After two years of research, with HV venti, the dream became true.

"THE AMPLIFIER​"

Like its predecessors,  HV venti is an absolute reference product  for the years to come, indelibly marking the history of Hi-End mobile electronics.

“The Thesis HV venti sets new standards in the world of car audio amplifiers. Only an extremely experienced designer could have created such an exclusive product. The six-stage power supply, the twomode amplifier (high current, high power), the completely hi-end, discrete devices and straight sound path will be well appreciated by the musical enthusiast. But it’ s only the result of a deep reconsidering of the meaning of the mobile amplifier concept. Every part of the Thesis HV venti was a rethink, and every single component was optimised using the most exclusive devices, solutions and materials. Every electronic, mechanical, thermal and aesthetical aspect was improved by going back to the beginning. The Thesis HV venti is the wonderful synthesis of an extraordinary engineering effort.”

Absolute lack of compromise in achieving maximum performance, this is the mantra followed by the Audison R&D for the HV venti, a project with the following unique features. Output power stage based on an innovative topology similar to IGBT (Insulated Gate Bipolar Transistor) but employing discrete devices. Total void of integrated operational circuitry that, due to their constructive technology and the low voltage level can deteriorate the signal. Their elimination allowed the engineers to work at higher voltages and with a Class biasing of the intermediate stages.

All signal commutations were treated using special relays : too complex of a circuit would have led to longer tracks and parasitic inductances, causing signal deterioration and loss of musical information. The whole input circuit is balanced up to the final stage “Front End”, while the amplifier’s configuration is “Dual Mono”. In order to avoid electro-magnetic interferences, no high current is passed on the main board.

HV VENTI UNIQUE DESIGN

Output power stage.

The output power stage is based on an innovative topology similar to IGBT (Insulated Gate Bipolar Transistor) but employing discrete devices. The circuit is made from a complementary pair of Hitachi DMOS drivers, usually used as output stage devices (such as in HR100), which drive two pairs of SANKEN power BJT transistors providing each with 30 A peak current capability and 200 W dissipation. This solution allowed the use of only two pairs of output devices, thus permitting bias currents which necessarily have to be shared according to the number of output devices in parallel to be reduced; therefore, increasing the bias current value on every output device is possible, keeping the total current absorbed by the amplifier stable when in idling status. All this leads to the increase of the output stage to A class value. The percentage of A Class and consequently the idling current can be adjusted via the BIAS current diverter. As a result of the configuration of the HV venti in Hi Power or Hi Current mode, there will be a variation of the A Class percentage and therefore of the idling current also.

To guarantee maximum sound quality, the crossover was made on a separate module supplied with the product. Available adjustments are Hi Pass/Lo Pass 12 dB and Lo Pass 24 dB mono. Four cut-off frequencies are selectable for the filter (45; 55; 65; 80 Hz). Although this solution is limiting compared to a continuously adjustable cut-off, filter linearity is drastically improved and long signal paths are avoided.

PREAMPLIFIER AND DRIVER

It is made of two groups, Front End pre-amplifier and control unit. The whole stage is balanced up to the driver outputs. The power supply voltage is 90 V and is specific for this stage and dedicated to the two separate channels. The separate 150 V power supply is thermally stabilized and A Class biasing. Input is balanced with the first stage, complementary JFET differential and the second stage, complementary BJT differential. The voltage amplifier is Cascode type with a buffer to drive the output stage.

POWER SUPPLIES

The product features two Hi power supplies for each channel providing power exclusively to the Dual-Mono output stage. Each channel power supply pair works in Synchro-PMW mode: an independent circuit controls each of them.  However, they are synchronized with one another and are designed to supply one single power source, one supplies the positive and the other the negative power. This solution allows engineers to increase the impulsive current transient response necessary to the amplifier. Furthermore, the two pairs of power supplies were synchronized to reduce radio frequency electro-magnetic interference. The layout featuring four separate power supplies has allowed the use of a single powerful MOSFET for each power supply rail, thus avoiding the paralleled configuration that is perhaps the main cause of amplifiers failures. Each transformer and related filter inductor were enclosed in nonmagnetic metallic shells and then filled with resin. This procedure further increases reliability for two reasons: first of all, coils are blocked and therefore made immune to vibrations; secondly, heat is homogeneously distributed, thus preventing any possible overheated areas. The resin-filled groups were then mounted onto the aluminium thick bottom plate to allow heat to be dissipated through side heatsinks. In order to avoid this kind of situation, you are often forced to use convoluted wiring which compel designers to accept compromises. Compromise is not accepted in the HV venti. Inside the HV venti a six layer thick copper board was used to gather all output stage return currents; the layout was created so that each current path comes close with the return current flowing backwards. This way the electro-magnetic fields are out of phase and nullify each other: this solution could be defined as a “ balanced power supply ”.

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