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HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 143

post #2131 of 3500
Quote:
Originally Posted by koiloco View Post
 

Good to hear your impression.  Please explain a little more about what you meant by "lowered gain" on the Emotiva vs. the other amps.  Are you talking about the built-in pre-amp stage in each amp?

I would have to check with Emotiva to see what the internal gain level is set at compared to the others. Pre amp stage in all the amps.

 

My Nexus 7 and a certain crappy interconnect cable I have is a good test for hiss/hum and gain levels. On the Mini-X, it is very low. The noise floor doesn't creep up until you pass 12 o clock. It is practically perfect for the HE-500.

 

The Lepai direct without tone control is very low as well. Once tone control is engaged, the noise floor increases and becomes noticable. The benefits of tone adjustment outweigh the cons for me. I was lucky to get a used bare wire cable for a good price, but if you are paying ~$100 for a Lepai 2020a, cable, and 5A power supply, you might as well get the Emotiva for $169 instead. The Lepai is like 90% of the sound of the mini-X without tone control.

 

The Lepai 200W is just too high, too powerful. Needs resistors. Could be awesome if it has a shared ground and a resistor adapter in between.

 

The SMSL 50Wx2 sounds better than the Lepai, and just about as good as the Mini, but has a higher noise floor and some hiss at all levels. This would also need resistors. I need to find out if it uses a shared ground as well. If this is shared ground + $13 resistor adapter, it would be a much smaller mini alternative.

post #2132 of 3500

The Mini-X is huge since it 18" depth not including the space for the banana plugs which may throw some users off. Not really a desktop amp in some cases. Due to the size of the parts, the transformer, size of the heat sinks and a fan which may will rarely turn on with headphone use. I would tend to think that the Mini-X is going to last longer than the Topping type amps since that power amp chip really does not have a good way to dissipate heat in the long run. The trigger input is handy in my case. Listening to music on it with my unbalanced headphones.  Will be testing  the balanced headphones tomorrow.

 

SMSL SA50 50WX2 TDA7492 The machine is BTL output, that is to negative side of speaker out is not public grounded (the two speakers cable must independent connect, no grounding together), we must strictly in accordance with the marking of plus or minus cable connection, this T amp is not recommend for car or bike use. as stated on Amazon

 

 

 

Mini-X


Edited by john57 - 10/30/13 at 7:09pm
post #2133 of 3500

^so john57, which one would you buy based on what you just said?

post #2134 of 3500

The SMSL SA-50 uses the TDA7492, which is a class D amp. It is incorrectly labeled class T. It says 50W, but it really only gets 30W @8ohm with acceptable THD. Still gets lots of power for a headphone at 38ohm, but has some hiss. The mini-x has less.

 

http://www.st.com/web/catalog/sense_power/FM125/CL1503/SC983/PF214773


Edited by bhazard - 10/30/13 at 8:26pm
post #2135 of 3500

^ I've read great reviews about the SMSL SA50 from different sources.  Overall build quality seems to be a step up from Lepai and Topping?

post #2136 of 3500

I’m about to purchase the HE-500 and the Emotiva mini-X A-100.

 

My concern is that I already own a receiver (Yamaha htr 6030). It is quite basic but I wonder if this receiver is going to perform similar to the Emotiva and I can save that money in a DAC.

 

I cannot do any test since I’m going to purchase the HE-500 and the emotiva in USA and I live in another country.

 

These are the specs of the HTR 6030.

 

100 Watts-per-channel into 8-Ohms. Output is measured at 1KHZ

 

RMS Output Power (1kHz)             100W x 5

Total Power (20Hz - 20kHz)           500W

post #2137 of 3500
Plenty of power but might be too much and u won't have as much play on the volume knob. Also, u might experience more hiss/hum. Make sure u have a balanced cable if the Yamaha doesn't have common ground.
post #2138 of 3500
Quote:
Originally Posted by bhazard View Post
 

The SMSL SA-50 uses the TDA7492, which is a class D amp. It is incorrectly labeled class T. It says 50W, but it really only gets 30W @8ohm with acceptable THD. Still gets lots of power for a headphone at 38ohm, but has some hiss. The mini-x has less.

 

http://www.st.com/web/catalog/sense_power/FM125/CL1503/SC983/PF214773

You right it is a class D amp Amazon is wrong. From what I read the TDA7492 has a output of 25 watts before the THD will rise quickly as shown here as an example. http://www.quantasylum.com/content/Home/tabid/40/EntryId/22/QA400-Measurements-on-SURE-2x50W-TDA7492-Class-D-Amplifier.aspx

I know from experience that there is always some trade-offs in each design. I just never there thought such a small amp will sound good. The item as shown on Amazon I have some reservations with. First I did not see much of a heat sink on the board. The TDA7492 board from parts express is a much better layout with a large heat sink and a fan.  http://www.parts-express.com/pe/showdetl.cfm?partnumber=320-301&utm_source=google&utm_medium=cpc&utm_campaign=pla

That will not matter if the case does not have ventilation for the heat to escape. With the Emotiva Mini not only it has a large heat sink with a fan it has ventilation slots on top and the sides and runs much cooler than the Emotiva XDA-1 DAC unit I have. In this case layout size does mater.

The only class D amp I have running is inside my JBL LSR305 speaker monitors which works extremely well.  

post #2139 of 3500

I would love to see power output transitors under the black radiator with fan

 

Can anyone take photo of them and post in here ?

 

Thanks

post #2140 of 3500
Quote:
Originally Posted by Nimzerz View Post
 

I'm wondering if anyone here has had this problem or can answer this. I know Koiloco and Modulor have attempted to answer or solve the solution, but who knows, maybe someone here knows the problem already.

 

I've plugged my HE-500 into my Denon AVR-2808CI receiver through speaker taps using a 1/4" to banana plug adapter and for some reason EVERY time I go to use it the right channel is out. The only way to make it come back is to turn up the volume to un-listenable levels and then the right channel begins to slowly fade back in (this seems to apply to when I use speakers as well). It has to do with volume because if I turn down the volume on my ipod (working as a preamp I guess) then the problem isn't solved until it reaches that same un-listenable level of volume. Anyone have any ideas? I've tried different variations of having 1 or 2 grounds plugged in instead and the problem still remains.


Just wanted to see if anyone knew this answer... this will be my last time "reposting" this though. Trying my best not to spam or anything :P

post #2141 of 3500
Is there an advantage running the he-500 to the emotiva with a balanced cable opposed to just using the he-500s bare wires with banana plugs attached?

Btw, I've reordered a mini X directly from Emotiva as I simply couldn't find anything that would match it within budget. Fingers crossed it arrives in one piece lol.
Edited by fluidz - 10/31/13 at 3:54am
post #2142 of 3500

Much like Class-D amps, Class-T amp are very power efficient and require little to no heat dispersion so compact enclosures can be used with no problem.  According to what I've read, anyway.  The TA2020 chip sounds like it would be good for a project/DIY amp...hmm :p 

post #2143 of 3500
Quote:
Originally Posted by fluidz View Post

Is there an advantage running the he-500 to the emotiva with a balanced cable opposed to just using the he-500s bare wires with banana plugs attached?

Btw, I've reordered a mini X directly from Emotiva as I simply couldn't find anything that would match it within budget. Fingers crossed it arrives in one piece lol.

The Emotiva just works and sounds the best ATM. It just has that extra bit of neutrality and a low noise floor that the others lack.

 

I'm still on the search for a smaller, cheaper equivalent. The higher end Topping amps are just too pricey.

 

I just need something smaller, as the mini is way too big for my desktop. When the sale ends, I may put mine up for sale at the sale price for someone else in the US to use with their HE-500.

post #2144 of 3500
Quote:
Originally Posted by bhazard View Post
 

The Emotiva just works and sounds the best ATM. It just has that extra bit of neutrality and a low noise floor that the others lack.

 

I'm still on the search for a smaller, cheaper equivalent. The higher end Topping amps are just too pricey.

 

I just need something smaller, as the mini is way too big for my desktop. When the sale ends, I may put mine up for sale at the sale price for someone else in the US to use with their HE-500.

What I did with mine is to put the Emotiva mini-X A-100 on a CPU roll out flat cart just underneath my desk shelf leftover from a previous computer built I had. Since the amp is well ventilated it will protect the amp from possible spills like the morning coffee and never put any thing with liquid on top of the amp.  I have a soft spot for large things as long I can find the room for it, issue resolved.

post #2145 of 3500
Quote:
Originally Posted by fluidz View Post

Is there an advantage running the he-500 to the emotiva with a balanced cable opposed to just using the he-500s bare wires with banana plugs attached?

Btw, I've reordered a mini X directly from Emotiva as I simply couldn't find anything that would match it within budget. Fingers crossed it arrives in one piece lol.

I am confused here.  In my head, technically, the 2 connection styles you are comparing here are identical.  So as far as sound quality, there won't be any differences.

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