your opinions on a cost effective audio solution - AVS Forum
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post #1 of 12 Old 04-18-2013, 01:18 AM - Thread Starter
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Hey,
I have a pair of old , Mission 701S speakers, and I would like to match them with a digital sound source + music room.
I thought about the following configuration:

• Source: Minix Neo X5 (HDMI and optical SPDIF) - estimated cost of $ 100
o serve as a mini PC / audio source from my home network
o connected to a computer screen through the HDMI port
• DAC + Amplifier based on TDA7492 or TK2050 (estimated cost of $ 120)
• Keyboard + Wireless Mouse

Would love to hear your opinions and ideas...
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post #2 of 12 Old 04-18-2013, 05:04 AM
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Quote:
Originally Posted by monolitus View Post

Hey,
I have a pair of old , Mission 701S speakers, and I would like to match them with a digital sound source + music room.
I thought about the following configuration:

• Source: Minix Neo X5 (HDMI and optical SPDIF) - estimated cost of $ 100
o serve as a mini PC / audio source from my home network
o connected to a computer screen through the HDMI port
• DAC + Amplifier based on TDA7492 or TK2050 (estimated cost of $ 120)
• Keyboard + Wireless Mouse

Would love to hear your opinions and ideas...

The Minox Neo X5 appears to be an Android-based media player with 16 GB of internal storage. It appears to need outboard USB-based external storage to compare to a small PC in terms of storage space for media.

http://www.ebay.com/itm/MINIX-NEO-X5-XBMC-NAVI-X-MOVIES-TV-PPV-STREAMS-FAST-/230952024895#vi-content



It requires a TC set for a display, and I don't see a keyboard or mouse input device or a place to plug one in. Apparently there is a way to control it with a smartphone.

The TDA7492 is a chip, and we mostly talk about products. Here is what appears to be a ready-to-go product based on the TDA7492

http://www.amazon.com/SA-50-TDA7492-Digital-Amplifier-Adapter/dp/B008XTDBYW



http://www.amazon.com/SA-50-TDA7492-Digital-Amplifier-Adapter/dp/B008XTDBYW

It is rated at 40 wpc @ 8 ohms and 10% THD, so it probably deserves a power rating in the 35 watt region as a hifi device.

Here are device specs: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00205863.pdf

There is an extant independent technical test:

http://www.quantasylum.com/content/Home/tabid/40/EntryId/22/QA400-Measurements-on-SURE-2x50W-TDA7492-Class-D-Amplifier.aspx

THD



1 KHz signal about 10 dB below clipping

From the chip manufacturer's spec sheet:



Not bad but not all that impressive

Bench Measured Frequency response:



Looks like this amplifier has the typical switchmode situation with frequency response that is dependent on load impedance.

Moving on to the TK2050 here is a typical product:

http://www.amazon.com/Topping-TK2050-TC2000-Digital-Amplifier/dp/B005VR1VQE



More circa 2002 chip designs, an apparent lack of technical tests, not all that encouraging.

Note that for the price of a Topping power amp you can buy this 5.1 AVR:

http://www.accessories4less.com/make-a-store/item/DENAVR1513/DENON-AVR-1513-5.1ch-Home-Theater-Receiver-3D-ready/1.html

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post #3 of 12 Old 04-18-2013, 06:47 AM - Thread Starter
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Hi,
thanks a lot for the detailed reply.
as for the source - i already have one Minix Neo running XBMC, connected via HDMI and controlled by my smart phone, tablet and fly mouse. Content is coming from my home file server, so storage is no issue.
great device - still lacking 5.1 sound (they are working now on SPDIF and HDMI support for this)

As for the amp (great idea btw) - as i live in Israel - the total cost of the product will be ~$400 due shipping frown.gif

i was thinking about a combined DAC / amp unit from YJ (http://dx.com/p/tda7492-dac-decoding-digital-amplifier-w-usb-coaxial-fiber-optic-black-156648)
I wanted to keep the cost down as I have just installed a Pioneer VSX 922 + Tannoy 5.1 set in my living room, and the wife wants to spend on more crucial stuff other than a 3rd stereo in the house smile.gif

what do you say?
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post #4 of 12 Old 04-21-2013, 02:50 AM - Thread Starter
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hi,
in the meantime my wife declared that the Mission speakers are a no go from her side due to their size....
so i was left with different choices:
1. buy amplified speakers such as MicroLab Solo 4C and connect them to the android mini PC
2. buy a type D amp + a new pair of small speakers (e.g. Diamond 9.0 or 10.0). This option would cost me ~$300$ more and my question is whether it is worth the price difference + whether the digital amp will be able to drive a 86-88db speakers.

cheers.
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post #5 of 12 Old 04-21-2013, 03:05 AM
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Before much more research is done on your behalf we must know first if these options have approval. tongue.gif

No, Mr. Bond. I expect you to die!
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post #6 of 12 Old 04-21-2013, 03:09 AM - Thread Starter
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hope so smile.gif

my plan to to actually bring each piece separately so my wife will gradually get used to the idea of more boxes popping out ...
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post #7 of 12 Old 04-30-2013, 10:08 PM
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Have you considered a QLS QA100 digital amplifier? I recently bought two of these to use with an Apple Airport express.

They are relatively low cost with very good sound. The QA100 amplifies digital signals from CD/DVD players, computers and digital music players directly and eliminates the need for a DAC.

QA100 is able to drive 4Ω@100W-8Ω@60W2 way bookshelf speakers

QA100 designed as open loop digital circuits and drives speakers with low impedance. You can check it out here http://www.qlshifi.com/en/wzcapi/qa100.htm.
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post #8 of 12 Old 05-01-2013, 12:58 AM
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A first post, in a thread that hasn't moved in days regailing the worth of a heretofore unknown product, always smells like shill to me.
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post #9 of 12 Old 05-01-2013, 07:32 AM
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Apple Airport express mod please check here http://forums.qlshifi.com/index.php, the topic on qlshifi-forums only talked about SPDIF output, however I saw the I2S mod somewhere else that is able to improve the performance of Apple Airport express+QA100 combo to very high level. Always remember to get a better power supply for the source equipment, that's best investment for the improvement of your system.

I have mine QA100 with a XMOS USB/SPDIF plugs into an old Thinkpad X41(Lubuntu) according to this thread: http://forums.qlshifi.com/index.php/topic,11.0.html, speakers is RC-70, the total cost of the system is:
RC-70 Speakers: $700
QA100: $240 ($390 with 40% off, )
XMOS USB/SPDIF: $150
Power supply for XMOS: $70

I have to say, the XMOS+QA100 combo is able to beat any traditional USB/SPDIF(or CDP)+DAC+AMP combo that priced over $1000 range easily, just like a piece of cake.
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post #10 of 12 Old 05-01-2013, 07:52 AM
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Quote:
Originally Posted by sg225 View Post

Have you considered a QLS QA100 digital amplifier? I recently bought two of these to use with an Apple Airport express.

They are relatively low cost with very good sound. The QA100 amplifies digital signals from CD/DVD players, computers and digital music players directly and eliminates the need for a DAC.

QA100 is able to drive 4Ω@100W-8Ω@60W2 way bookshelf speakers

QA100 designed as open loop digital circuits and drives speakers with low impedance. You can check it out here http://www.qlshifi.com/en/wzcapi/qa100.htm.

Have you checked the Apple Airport express mod over the QLS-HiFi Fourm: http://forums.qlshifi.com/index.php/topic,446.0.html? I saw the I2S mod for Apple Airport express somewhere else that is easily to improve the the performance to very high level, you can get a better power supply that will improve the system performance even more.

I have mine QA100 with a XMOS USB/SPDIF, the XMOS+QA100 combo is a very cost effective and perfect solution for my speaker RC-70.
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post #11 of 12 Old 05-01-2013, 11:44 AM
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Ditto.
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post #12 of 12 Old 05-02-2013, 04:45 AM - Thread Starter
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i know .... a shame that getting such lame marketing attempts ...
i took a look in the product and the price range is off the charts ... moreover the value that this brings is questionable.

i wanted something cost effective (~$100 range for amp and DAC) and same amount for speakers (OR powered speakers such as Microlab Solo 4C)
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