Inside swan d1080 iv

[amallalone]

Seniors please help me modding this amp..m a novice in speaker diy..where should I first start from..??

 

[VSTEREO]

What kind of modifications you are looking for? This would help seniors to pitch in..

 

[greenhorn]

Usual tweaks are replacing the electrolytic caps in the signal path for enhancing sound quality
Upgrading op amps if any
Bypassing the tone and volume controls
Checking the output stages and putting a bigger transformer and bigger caps to increase output

 

[amallalone]

Thanks for reply..
Btw some more information about the amp section..
Chip in preamp section TL084CN
Amp section it is tda 7296
8 x 50v 1000uF cap.. unknown company
Transformer it is normal one (not toroidal) with 18v x2 1.8A and 8v x2 0.2A
There is separate connection for tweeter and sub on the output section..
Amplifiers System
Rated Power 34W RMS/Channel
Filter Type? Professional active crossover filter
Rated Power 34W RMS/Channel
Active Crossover Frequency 1.7kHz
Bass Adjust '+3/0/-3dB
Bass Adjust '+3/0/-3dB(100Hz)
Treble Adjust '+3/0/-3dB(10kHz)
Treble Adjust '+1.5/0/-1.5dB
Separation >58dB
Signal-to-Noise >78dB (Unweighted)
Harmonic Distortion 140Hz-20kHz ?1%(85dB/1m)
Input sensitivity 680mV
Input impedance 28k?
If I replace any one the above components does that make any difference in sound quality??

 

[greenhorn]

Assuming that the speakers are 4 ohm, they could use a bigger transformer. Would suggest a separate 18-0-18 or if available 22-0-22 3A or 5a transformer to feed the power amp section. 24v might be easier to get, but might be too much for the chip to handle. .

Also check the components just before the woofer and tweeter. This should be the crossover components and the capacitors may be upgradeable
I see 4 output devices? Are they bi amped?

 

[amallalone]

Yes sir they are bi-amped..the speakers are active crossover..4 output wire 2 of each going to woofer and tweeter..also can I upgrade the preamp section

 

[greenhorn]

Preamp upgrade is a bit more complex. You need to figure out the circuit.

But at a high level upgrading signal path caps is one thing to do, identifying therm is hard

 

[amallalone]

There are 8nos of 1000uf 50v cap.. should I first start with replacing them with a good one like nichicon ..

 

[Audiodoc]

Op amp in your case is soldered to the board you will need a good desoldering gun, desordering wick, copious amounts of Flux to remove. Later you insert a ic base for rolling opamps.

Upgrading the preamp section, capacitors in the signal path and power capacitors would be the best upgrades. Transformer upgrade is un necessary as a first upgrade.

Be careful not to damage PCB tracks.

It seems the circuit uses 4x1000 uf ie 4000 uf per rail. Getting it up to 10000 uf per rail is preffered. 2500 uf x4. Note the diameter of the caps before ordering. You can add 0.1 uf caps to each cap on the soldering side to further decrease ripple.

Later you can change all caps of the preamp board to polyester wifa if you can get them cheap.