Salas hotrodded blue DCB1 build - Page 176 - diyAudio
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Old 18th March 2012, 07:33 PM   #1751
Salas is online now Salas  Greece
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Are those Spendor S100s if I remember well? If so, very weird, those are 300mm bass driver ones.
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Old 18th March 2012, 07:45 PM   #1752
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Yes, the same S100s. Lots of users have quite the opposite. Room full of bass if positioned incorrectly. Should I try to mess with polarity? Is it safe swaping both speaker leads?
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Old 18th March 2012, 07:48 PM   #1753
Salas is online now Salas  Greece
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Swapping speaker leads is no threat. Swap in all possible ways for seemingly same or reverse polarity between channels. Always when power is off, and watch not to short any + to -. Do it at the cabinets end.
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Old 18th March 2012, 08:32 PM   #1754
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Swapped in all possible combinations... Neither of them brought out the slam. Speakers are tri wirable, so I've tried using just the bottom end to see if it's alive at all. Let's say it's working, but the sound is very veiled, not rythmic at all on a track it should be. But again I'm not an expert of listening just to bottom end.

Next step opening cabinets? Can't believe this. So one more question. Do all 4 female sockets on buffer have to be joined through grounding via one wire? Or just left and right of input and output separately as I have now.
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Old 18th March 2012, 08:39 PM   #1755
weskoki is offline weskoki  Europe
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Have you tried other pre? Or just go direct?
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Old 18th March 2012, 08:48 PM   #1756
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I've tried passive stage. Awful! I've tried my work mac direct to amp. It gives a temporary illusion of firmness but my guess it's coming from midband. Otherwise all the same. I've tried both full output on soundcard and software attenuation, and vice versa.
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Old 18th March 2012, 09:03 PM   #1757
Porfido is offline Porfido  Italy
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LET THERE BE LIGHT!
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Done! Thank you so much, guys!


Can I ask you something? But, please, forgive my english...
I will get to stage 2 hotrodding (600mA), but I really can't understand the principle of this, because I'm electronic newbie...
Let me explain: if the jfets will anyway absorb the same amount of mA, what changes giving more current to the psu?
What gives the result of more sound quality in this, giving to the PSU current that fets anyway don't need?
Could you please explain?
Thank you very very much!
Regards!
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Old 18th March 2012, 09:08 PM   #1758
Salas is online now Salas  Greece
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The PSU Mosfets work on ranges that they conduct more and the PSU becomes lower impedance, everything works in heavy current mode around it. The filter capacitors, the Tx, the diodes. The signal does not sake them the least at such humongous power difference. DCB1 is a huge symmetric shunt power supply with a DC coupled tiny buffer at its end in essence. Brute force approach. Like those NASCAR things. Add your favorite Rock n' Roll soundtrack.
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Old 18th March 2012, 09:11 PM   #1759
piero7 is offline piero7  Italy
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Hi Salas, what the value of the impedance with 600mA output current and 2A?
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Old 18th March 2012, 09:11 PM   #1760
Porfido is offline Porfido  Italy
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Quote:
Originally Posted by Salas View Post
The PSU Mosfets work on ranges that they conduct more and the PSU becomes lower impedance, everything works in heavy current mode around it. The filter capacitors, the Tx, the diodes. The signal does not sake them the least at such humongous power difference. DCB1 is a huge symmetric shunt power supply with a DC coupled tiny buffer at its end in essence. Brute force approach. Like those NASCAR things. Add your favorite Rock n' Roll soundtrack.
Thank you very much, Salas!
Now I'm even more tempted by Stage 3....
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Last edited by Porfido; 18th March 2012 at 09:31 PM.
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