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Old 11th January 2006, 11:08 AM   #171
6h5c is offline 6h5c  Netherlands
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Default Re: Very initial hdam removal impressions

Quote:
Originally posted by SimontY
On quietly, I felt the sound had greater clarity, and there was a reduction in the haze that blocks the music at low volumes.

Listening to Whigfield I felt the sound had subjectively sped up, perhaps sounding a little more 'peppy' and less weighted down.

The bass is a touch less stodgy, but still kicks hard (a relief) and low. The stereo imaging seems more distinct, and drums have more resonance.

The only possible negative is a slight bit of roughness/raggedness, which could of course easily be a revelation and not a colouration.
in the mid to low bass.
Hi Simon,

Good to hear you've got improvement, and that your player seems to work o.k. now. I think the bypassing of the HDAM is the biggest influence. In my experience the sound opened-up a lot. You have 4x OPA627 in there right now?

Ray.
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Old 11th January 2006, 11:09 AM   #172
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Well i'm about to start the bypass now
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Old 11th January 2006, 11:18 AM   #173
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
Well i'm about to start the bypass now
I'm curious what you find, but I bet you won't be disappointed
It's a simple mod, and the results are quite big I think.

I put in a 47R to make the output-impedance lower. It will make it easier to drive the cable. I'm going to try even lower (22R), but I have a muting relay behind it, so I don't want to short the opamp's outputs too much. Still have to look into the datasheet.
You can go as low as zero without any muting behind it, but I haven't tried it yet. I know some reports of oscillation in that situation, but that strongly depends on the opamps.

Ray.
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Old 11th January 2006, 11:20 AM   #174
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Default Re: Re: Very initial hdam removal impressions

Quote:
Originally posted by 6h5c


Hi Simon,

Good to hear you've got improvement, and that your player seems to work o.k. now. I think the bypassing of the HDAM is the biggest influence. In my experience the sound opened-up a lot. You have 4x OPA627 in there right now?

Ray.
Yo Voodoo Ray,

I expect after more settling down and burning in the sound will change a little again, but I would have to concur that the sound significantly "opens up" by removing the HDAM buffer.

4x OPA627BP, yes. These go into sockets, and 33uF/50v FC sit under each psu pin to ground of the sockets. I intend to put additional bypass caps on the Brown Dogs, as I never got around to doing that. At some point in the near future I will order some more Brown Dogs and add other combinations to try, but I don't want to ruin my current ones with bird-poo soldering. And I simply love the character of the 627 and Pany FC.
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Old 11th January 2006, 11:26 AM   #175
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I may try reducing the size of the output resistors. I put 100R there because that's about what I had previously. Is it basically a case of the lower the better with this? At some point I may try a fancy resistor (but I don't expect to hear much change) or a carbon resistor, as I think I like the carbon colour. Eat me!
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Old 11th January 2006, 02:52 PM   #176
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Right! After listening for several hours @ work (on my amp and speaker set up used for testing) I can certainly say the HDAM bypass mod has opened up the sound further still.

On beverley knight the piano just decades away superbly.

I used silver wire (with silver loaded solder) from U210/U214 to R659/660 and used 10 ohm resistors.

I will report on my findings @ home tomorrow
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Old 11th January 2006, 04:11 PM   #177
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Quote:
Originally posted by SimontY
I may try reducing the size of the output resistors. I put 100R there because that's about what I had previously. Is it basically a case of the lower the better with this? At some point I may try a fancy resistor (but I don't expect to hear much change) or a carbon resistor, as I think I like the carbon colour.

Quote:
Originally posted by rowemeister
I used silver wire (with silver loaded solder) from U210/U214 to R659/660 and used 10 ohm resistors.
Hi Simon,

Meister just answered your question I guess

I changed two resistors in my loudspeaker cross-over to Kiwame carbon recently, and I was surprised by the change (positively...)!
Maybe it's worth testing a bit with different types. Common metal films can sound quite harsh i've heard, so I also put in a regular 0,25W carbon.

Ray.
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Old 11th January 2006, 04:18 PM   #178
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Quote:
Originally posted by rowemeister
Right! After listening for several hours @ work (on my amp and speaker set up used for testing) I can certainly say the HDAM bypass mod has opened up the sound further still.

On beverley knight the piano just decades away superbly.

I used silver wire (with silver loaded solder) from U210/U214 to R659/660 and used 10 ohm resistors.

I will report on my findings @ home tomorrow
Glad you like it!
So the 10R works good obviously. What opamps were you using again?

I like the open sound a lot. Makes me wanna hold my breath not to interfere with the music

Ray.
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Old 11th January 2006, 04:39 PM   #179
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Quote:
Originally posted by 6h5c

Hi Simon,

Meister just answered your question I guess

I changed two resistors in my loudspeaker cross-over to Kiwame carbon recently, and I was surprised by the change (positively...)!
Maybe it's worth testing a bit with different types. Common metal films can sound quite harsh i've heard, so I also put in a regular 0,25W carbon.

Ray.
Good evening,

Kiwame eh? Sounds fancy

I remember not liking the change in some ways when I replaced lots of the carbon ones in the output stage of the cd63 with cheap 1% 1/4w metal films. I felt the sound lost some charm or something. It's something I've been meaning to investigate.

The only series resistance in my x-overs is a little piece of resistance wire to bring the tweets down a fraction
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Old 11th January 2006, 06:14 PM   #180
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Quote:
So the 10R works good obviously. What opamps were you using again?
My op amps are currently the OPA2134 but I have the OPA627 and OPA132 ready and waiting for the Browndog pcbs to arrive.

Now then....

I have listened to my cd with the reg pcb last night and talked about the gains.

Well I have been listening to the HDAM bypass mod on my system @ home.

Its brilliant!! Its added even more to every aspect of the music.

Its very open the bass is so much better over the lower frequancies.

The midrange is just breathtaking.

The treble is soooooo controlled and tight, no splashiness what so ever.

I RECOMMEND THE HDAM BYPASS MOD.

The only reservation I would have is to anyone who has done little mods. I have loads of rectification, black gate caps, clock pcb ,decent op amps etc.

So maybe it only works on heavily modded players, but thats up to you to find out.
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