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SlimChances
2017-11-26, 09:06
I am planning to buy a small T Class amp to go with a pair of Sinclair 40iX bookshelf speakers for my office. I see there is a multitude of these amps on EBay but I have no idea what is good and what is garbage. I will be using this with a Squeezebox(either a Touch or Classic) for my office. Digital out would be good but none of them seem to have this.
Thanks

johnas
2017-11-26, 09:44
I recently bought a SMSL Q5 Pro and am really happy with it. Digital and analog inputs, IR, sub out. Works with harmony. At about $120 it is more expensive than a Lepai, for me it is worth it.

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drmatt
2017-11-26, 10:27
Tbh they mostly sound very similar. The cheaper ones used to have pretty poor analogue volume controls but now that's all digital frankly they are as interchangeable as DACs. For the money (i.e. not a lot), pick the one that has the features you need and looks nicest..


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Grumpy Bob
2017-11-26, 11:37
I'm using the following in my office: Amptastic mini-T amplifier with a pair of small bookshelf speakers. I'm using an old Raspberry Pi with a HiFiBerry Dac. LMS running on a WiFi enabled WD MyPassport drive. This is fine for my purposes (I don't really run it at high volume!).

Here's a picture (http://forums.slimdevices.com/showthread.php?102957-pi-based-systems&p=814509&viewfull=1#post814509) (before I put it in my office!)

Robert

drmatt
2017-11-26, 11:53
They are so small you can buy the bare amp boards and mount them on the back of a speaker (or indeed inside) for an "active speaker conversion"..


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d6jg
2017-11-26, 12:08
Personally Id opt for a Class D amp.
I have a couple of such amps from Topping that I use in the office etc. Build quality is good.

SlimChances
2017-11-26, 12:50
Personally Id opt for a Class D amp.
I have a couple of such amps from Topping that I use in the office etc. Build quality is good.

Class T amplifier technology, so named because it comes from a company named Tripath. It's a trademark, not a recognized amplifier class; it's really just a variant of high-efficiency Class D (switching) amplification.

....
https://www.lifewire.com/lepai-2020a-vs-topping-tp30-amp-review-3134838

d6jg
2017-11-26, 14:28
Class T amplifier technology, so named because it comes from a company named Tripath. It's a trademark, not a recognized amplifier class; it's really just a variant of high-efficiency Class D (switching) amplification.

....
https://www.lifewire.com/lepai-2020a-vs-topping-tp30-amp-review-3134838

Interesting article.
The Topping Class D amps are definitely better built than the Lepai - Until recently I used one of mine with a pair of Mordaunt Short M10s as a sound upgrade on my bedroom TV. It worked very well but I have replaced it with something else now as I need more inputs.
The other Topping drives a pair of Wharfedale Modus Cubes but more frequently a pair of AKG headphones by my bedside. It is fed by a Pi2 with iQaudio DAC (pCP).


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SlimChances
2017-11-26, 15:04
Ended up buying this off Amazon FX Audio D802C 80WPC Pure Digital Amplifier
It seemed to have good THD, lots of inputs and didn't look bad
I found this article comparing it with three other makes but it just added to my general confusion
http://www.qobuz.com/IE-en/info/Hi-Res-Guide/Comparison-Four-digital-amplifiers178041
It is not a T-Class but is D-Class

Jeff07971
2017-11-26, 16:02
Personally I’d opt for a Class D amp.
I have a couple of such amps from Topping that I use in the office etc. Build quality is good.

Most of the Toppings I know of are Class T using the Tripath 2020 or 2024 "chips"

The TP-30 uses TA2024 and the TP-60 the TA2020

As Slimchances says they are Class D amps but have DSP in the feedback loop as well as other enhancements.

ian_heys
2017-11-27, 00:05
I've used the Topping VX2 as a USB DAC/AMP for PiCore in the past. It has additional switchable optical and RCA inputs.

I used it to enhance TV sound and to listen to LMS Music and Radio.

I now use HDMI/Jivelite from the PiCore and a single optical TV output to the Topping and external TV Speakers.

Very versatile and well built.

satkinsn
2017-11-28, 17:47
So here's a question: the company that developed the T amp went under a decade ago.

Where are all the "class T" chips coming from in 2017? Checking the web site of Cirrus Logic, which bought the intellectual property of Tripath, shows no sign of the chips being available new.

And yes, they're pretty wonderful. I have a few of them, most especially the Trends Audio 10.1, which was an audiophile darling several years ago (http://www.tnt-audio.com/ampli/trends_ta10_e.html). I use it in my basement system, where it drives a pair of PSB B25s reasonably well.

s.

s2kiwi
2017-11-28, 20:12
I'm running a few.

I started with these 15w boards (https://www.ebay.com/itm/DC-12V-TA2024-2-X-15W-4-ohm-Class-D-Audio-Amplifier-Board-Stereo-Hifi-Mini-T-Amp/131825272505?epid=1266438718&hash=item1eb16606b9:g:aQIAAOSwR5dXQ~tA)
and was surprisingly impressed. Cheap bare boards, but sound quality is surprisingly good and unbeatable for the price.

Now I've switched to a higher power 100w board like this style (https://www.banggood.com/2x100W-TPA3116-D2-Dual-Channel-Digital-Audio-Amplifier-Board-12V-24V-For-Arduino-p-1019109.html?cur_warehouse=CN). They seem slightly warmer. They do feel slightly less refined than the 15w board, but the extra volume control allowed me to level the volumes across multiple rooms easier so worth the trade off. Still the quality is astonishingly good for the price and I think the extra powere of the 100w option would probably be a better fit with the speakers you are trying to drive.

For what it's worth, I've added a 5 DAC and a 5 PiZero to each board to make stand alone units for each room of the house. It's astounding you can get this quality sound in a standalone player for under 25.

drmatt
2017-11-29, 01:48
Seems likely that "class D" was not copyrighted by them, only their own implementation was protected, hence the clones. They are the future of amplification in the same way that digital cameras eradicated film...


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Jeff07971
2017-11-29, 03:20
So here's a question: the company that developed the T amp went under a decade ago.

Where are all the "class T" chips coming from in 2017? Checking the web site of Cirrus Logic, which bought the intellectual property of Tripath, shows no sign of the chips being available new.

And yes, they're pretty wonderful. I have a few of them, most especially the Trends Audio 10.1, which was an audiophile darling several years ago (http://www.tnt-audio.com/ampli/trends_ta10_e.html). I use it in my basement system, where it drives a pair of PSB B25s reasonably well.

s.

There is obviously plenty of Tripath chips still around all of Hifimediy.com s "T" series amps use them as well as others

d6jg
2017-11-29, 03:35
All of the HiFiBerry Amps and the like are Class D aren't they ?

Jeff07971
2017-11-29, 03:45
All of the HiFiBerry Amps and the like are Class D aren't they ?

Apparently (via google) the HifiBerry use TI's TAS5756M chip which is quoted as a class D

Of course the Tripath was a Class D with extra enhancements others may have reverse engineered the "enhancements" so who knows whether these re the equivalent of class T or not.

For anyone who's interested here's the Tripath patent https://www.google.com/patents/US5777512

Also looks like the patent has expired

Julf
2017-11-29, 10:38
"Class T" was just a fancy name for tripath's class D stuff. Class D is much older than tripath.