Collection of mods for Beresford TC-7520

**leo** · 05-09-2009, 17:08

Stans bass mod added to the first post for easy finding

**HighFidelityGuy** · 07-09-2009, 09:42

Originally Posted by leo

Stans bass mod added to the first post for easy finding

Thanks Leo. Was 36k decided upon as the best value for everyone or is it dependent on the system the DAC is used with?

Thanks.

**leo** · 07-09-2009, 15:15

Originally Posted by HighFidelityGuy

Thanks Leo. Was 36k decided upon as the best value for everyone or is it dependent on the system the DAC is used with?

Thanks.

After a few trials Stan liked 36k best, I tried it and have to agree 36k seems to be the sweet spot (after trying various other values and was using 42k before)
I've now tried it with three different amps, two different pairs of speakers and a pair of headphones, it seems to go well with them all where as the other higher and lower values was more system dependent

Of course if your bored try a few alternative values , if you can't be arsed just go for 36k, its easy to cut out altogther if you don't like it

**HighFidelityGuy** · 07-09-2009, 15:39

Thanks Leo. It sounds like you and Stan have tested this fairly extensively. I might give this a go, it sounds interesting. I'm also going to try the 4562HA's I have spare. I'll try them independently first though.

It sounds like this mod boosts the bass output a bit but also helps tighten it up. I'm slightly concerned about the bass boost as I already have a big boost around 150Hz due to a room node which I tame with EQ. However I have a dip in bass above and below 150Hz. I was wondering if was possible for you to explain what frequencies this mod seems to accentuate to help me decide if this is worth trying?

Thanks.

**StanleyB** · 07-09-2009, 17:16

I starts at about 100Hz.

Stan

**Covenant** · 07-09-2009, 17:58

I have just been reading about a few op-amps and wonder if anyone has tried them:
They are
AD823 AN and OPA 627BP. The latter is single channel so two are required on an adapter. They are also very expensive.

**Puffin** · 07-09-2009, 19:16

All this talk of expensive op-amp swapping makes me wonder if anyone has tried a discrete op-amp. You wouldn't be able to fit the lid on the case, but it might make for intersting comparisons.

**Covenant** · 07-09-2009, 19:35

The first one I mentioned is only about £4 its the second one thats about £56 when you get two mounted on an adapter. I dont think I would pay that but would love to hear a review from someone who could afford it.
Tell us more about discrete op-amps Puffin if you dont mind.

**leo** · 07-09-2009, 19:43

Originally Posted by Covenant

I have just been reading about a few op-amps and wonder if anyone has tried them:
They are
AD823 AN and OPA 627BP. The latter is single channel so two are required on an adapter. They are also very expensive.

Not much help but anyway

I've tried OPA627BP a few times in the past (not in this dac though)
It has its fans but I found it to add lots of signature in every app I tried it in, sickly chocolatey signature , some people will like that , I certainly didn't

AD823 maybe worth trying in the Headphone section, its pretty well specced for driving cans , not tried it in this dac yet though

**Puffin** · 07-09-2009, 19:47

Have a look at the thread on Diyaudio for the applications for the Diamante. Basically it does the same as an op-amp IC, but with separate semiconductors.

http://www.diyaudio.com/forums/showt...light=Diamante

I bought some boards, but have yet to build them. Too many projects, too little time!

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