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    Thread: Le Classe A - DIY Jean Hiraga Super 30W Class A Amplifier

    1. #61

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      speaker tweaking..

      carpenter had basically dumped the speakers at my place. it had many shortcomings when compared to original plan.
      i'm trying to improve the speaker response: sometimes certain frequencies and vocals go very loud [surpassing other instruments] and i have to reduce the volume. thought i will start with fixing some known anomalies in this example.

      speakers are not flush mounted,
      Click image for larger version. 

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      and you can see that i've used only 3 screws since the screw holes were not aligned properly.
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      decided to use this tool for flush mount
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      after lot of effort, somehow got to this extent,
      Click image for larger version. 

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      later used this poly fiber layer for layering few panels which were not covered by carpenter,
      Click image for larger version. 

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      also teased the same stuff and filled the box [might compensate a little for lost volume due to mis-calculation],
      Click image for larger version. 

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      not exactly a flush mount but .. [don't wanted to risk cracking the panel by going deeper since the process was violent..]
      Click image for larger version. 

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      also got the allen key bolts, looks much better now. original allen key bolts were not handed over to me by carpenter [i had shipped many of the components directly carpenter so that he could complete the build at the earliest].
      Click image for larger version. 

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      so far i have not tested the speaker response. will replicate this change on other speaker tomorrow. hopefully this change should help if not i would have to go for a simple Baffle Reflection Response circuit at speaker end.
      Last edited by bhpistorqintorpm; 28th May 2017 at 01:36.
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    2. #62

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      There is another way to flush the drivers. Use ply as MDF will break. Measure the speaker protrusion and get a ply just thick enough to match that protrusion.
      Cut a rectangular piece to match the speaker front size. Next cut a hole to match the size of the speaker baffle.
      Seal the piece to the speaker front, you may use a combination of paste and nails. Now paste the mica to get the necessary finish.

      Mount the speakers, they will be fully flushed.Click image for larger version. 

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      Car Audio: 4-way active
      Home Audio: Passive

    3. #63

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      Quote Originally Posted by gkannan View Post
      There is another way to flush the drivers. Use ply as MDF will break. Measure the speaker protrusion and get a ply just thick enough to match that protrusion.
      Cut a rectangular piece to match the speaker front size. Next cut a hole to match the size of the speaker baffle.
      Seal the piece to the speaker front, you may use a combination of paste and nails. Now paste the mica to get the necessary finish.

      Mount the speakers, they will be fully flushed.
      I had thought of it... And it would've been an easy fix, but I've got the box veneered and also it contains grill magnets inside. If i include another layer, both grill magnet and veneer finish would be lost. Box is made of plywood and so far it has withstood the grinding. Couldn't finish the polishing today.. probably will take couple days before I'll start using these again...

      Other option is using piece of ply just the way you've explained but just around the speakers. And the ply edges would be tapering and will merge with baffle.. had seen couple of such examples on diyaudio but on floor-standars..
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    4. #64

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      Quote Originally Posted by bhpistorqintorpm View Post
      Other option is using piece of ply just the way you've explained but just around the speakers. And the ply edges would be tapering and will merge with baffle.. had seen couple of such examples on diyaudio but on floor-standars..
      This is exactly how I made it in an earlier floor standers as the carpenter did not have the tool
      Car Audio: 4-way active
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    5. #65

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      it's been almost a month that one of the components in the amplifier failed : a toroidal transformer powering speaker protection board.

      this transformer draws it's power from Soft Start board in parallel with main power transformer. the temperature around the transformer is a constant 48-49 Degree Celsius [even after 4 + hours of playtime. so not sure of the reason for failure. according to manufacturer it could be due to high voltage.

      here are the pics. just ordered replacement. planning to have few more vent holes on the bottom the amplifier chassis this time around.

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    6. #66

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      oh that looks like the transformer was electrocuted ....wish your new transformer a long life.
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    7. #67

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      Amps have received new teak fascia, and a short video of music being played!
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