Another project, all digital DDX amplifier

[gychang]

I agree volume should remain...

[jaistanley]

I completely agree with at least keeping the option of volume control. You would be limiting your Market to only devices that can do digital volume. Many will want a high quality, simple 2.1 stereo solution for playing their music from cd player...

I also personally think the cross over point should be lowered. 80hz won't appeal to those with larger main speakers who want to integrate a sub. 320hz is way too high and would mean the sub is far too easily located.

Just my thoughts...

[oon_the_kid]

Originally Posted by hifimediy

thank you guys.
About volume display, do you think some LED dots is ok? like 0dB, 5dB...,20dB. if we add a rotary for volume.

Personally I think it is fine without LEDs if it makes it more complicated. I am happy without any volume indicator as long as the volume resets to the minimum on power turn on. On the other hand, option for remote control would be nice... either as a different board and connect it in later or even if built on board if it is not too complicated.

I agree with the other comment that 80Hz bypass might be a bit high, there might be those with speakers which can go down to 50Hz (many bookshelfs).

Oon

[oon_the_kid]

Some afterthoughts on your proposal for your system.

I personally think that 2.1 with a powered sub will be quite useless because most people already have powered subs. You pretty much have to DIY if you wanted a non powered sub. DIY subs are messy business, big box, need heavy bracing, thick wood etc... I think a 2.2 line level analog out would be better. The output we could then feed into a sub or use one of your higher powered module (TA3020?). Alternatively it could be a SPDIF coax out which we can then use on one of your DAC with TA3020 modules or a external powered sub.

Of course these are my personal thoughts, other people might differ on that...

My

Oon

[Mitch311]

I am personally very happy with where this is going. I agree that a volume control is a necessity I also agree that I really don't need an indicator if it makes it more difficult. About the power output of the chipset. Will the two main channels (80x 8ohm) be capable of handling 6ohm load or would it stress them too much?

[Steidl Guitars]

Originally Posted by jaistanley

I also personally think the cross over point should be lowered. 80hz won't appeal to those with larger main speakers who want to integrate a sub. 320hz is way too high and would mean the sub is far too easily located.

I agree; lower the entire series of crossover points.

[SoldierAnt76]

I agree that LEDs indicating the volume are superfluous - once the board is installed in a case, people won't be able to see them anyway.

But it's critical for the volume knob to have minimum/maximum stops, so you can feel whether you've turned it all the way up or down. Steps for each increment would also be nice.

And I respectfully disagree about resetting the volume each time the unit powers on - the volume should remain at whatever level the knob is set.

[Pano]

Moved to Vendor's Bazaar. This is a thread about a commercial product, not a DIY project.

[SoldierAnt76]

Hifimediy - what are the power requirements (I noticed the three terminals, so I assume it can work with a transformer)? And I assume this board will require a heatsink like your Tripath amps?

[hifimediy]

yes, it's similar to T4, so a transformer or a SMPS can be used. And there would be a heat-sink.