mtx 421d mono amplifier
583659
I got one of these to push a 12" sony x-plod rated at 300 watts rms. The 421d is a small monster,my sub is a 4ohm sub placed in sealed enclosure and at this load the specs say it puts out 150watts rms believe me its a true rating,probably under rated and i can also wire it in a 2ohm load giving another 150watts. WHEN i looked at this amp i saw knowone had any thing to say as a review so i thought i might give one , it might just help someone make up their mind. All in all i like this amp if it lasts a while i will up date my review.
2830344
If you have a good amplifier and some decent speakers this interface is worth the money.  It has a strong and clear "line-level" output, a very clear reproduction of higher frequencies, and does not require any special software to operate.  If you keep in mind it was designed to be used for a good clean stereo output for music you shouldn't be disappointed with its performance.  Compared to its "little brother" from the same company, this "+" model offers a more open sound stage and a higher level of detail.
800948
Small compact ,powerful great addition for the Ml sound board
4573836
Nice sounding bargain setup, you'll need to change the amplifier cable because the one they send will cause so much static you won't want to play it. Fix that and the kit is perfect, otherwise plan to spend another 20 bucks.
2804068
Really great little amp in all honesty. Looking for a solution to replace/upgrade from a 5.1 Logitech that I've had for about 12 years or so. I had a pair of Paradigm Atom Monitor V5s sitting and I wanted to integrate them into my PC. This amp drives them NO PROBLEM to pretty high levels. The complaints about lack of bass have not been an issue with this amp mated to the Atoms. Keep in mind these are very capable bookshelf speakers which due to physical limitations cannot produce deep bass rather they get down to about 45HZ without flinching. 90db sensitivity and "recommended" input of 15-80 watts makes this Orb Mini T V3 a pretty good match.

Driving the speakers at decent levels puts no strain on the Orb and the unit is only slightly warm to the touch. No audible distortion unless the volume of the PC and the amp are mismatched or I've switched to DTS Enhancements and played with the levels. For my set up, I think the Atoms would greatly benefit from desktop stands/wedges in order to aim the tweeters upwards to my sitting/listening position.

If you are buying this amp to use with tiny desktop speakers, you'll probably be disappointed with the sound quality but that is mainly due to the degraded quality of the speakers, not the amp. Should you have quality bookshelves, this amp will suffice and impress. There is no clear choice under $100 and the next step up would be the Audioengine N22 at $199. I weighed the decision between this and the Chinese tripaths at $50 and under and I am confident for the few extra dollars, I made the best choice.
2674311
I received an updated Kinter MA-170 with the E version PWB) (X000C4O79P mfg 13.08.06) which no longer has left and right channels reversed and is no longer inverting.  This was ordered without the Zitrades power supply.  In addition it has a new IC output chip (TDA 7266) which is direct coupled to the speakers rather than with capacitors.  As a result, with the Treble set a maximum, there is little input to output phase distortion in the Treble region.  There is no visible zero crossing error. There is still low frequency amplitude distortion.  The output negative leads to the speakers cannot be shorted, and therefore some care is required if headphones are to be used.  I converted my headphones to keep the return leads separate and it worked fine.  The TDA 7266 is heat sinked to the side of the external case instead of the bottom (an easy way to recognize the E version), and no longer distorts (bends) the PWB as a result.  The action of the tone controls is still pretty much the same as the MA-170D.  Setting the treble to minimum and the Bass to slightly above minimum (the Bass control has a switch action at the lowest setting) achieves the best 1kHz square wave indicating minimal phase and amplitude distortion.  Advancing the bass control achieves a room equalization resulting in a gradually decreasing amplitude response with frequency through the treble range.  The MA-170E has usable frequency response and Bass Action to 4 hZ (Bass at max, Treble at min, volume about ), which is remarkable.  You will notice the difference (with the appropriate speakers or headphones) when listening to material which is bass heavy such as the Pirates of the Caribbean.  This is an improvement over the MA-170D which is capacitor coupled and has response to 17 Hz.  For me the MA-170E allows low level listening with minimal irritation.  Using a 1 amp 12 volt switching power supply puts noise on the output and causes the amplifier to shut down at about 4 volts peak to peak output or about 1/4 watt out RMS into 8 ohms.  The power is not an issue with headphones but the noise is.  Use of this amplifier with the Zitrades 12 Volt power source is recommended to minimize noise and avoid shut down.
4957430
For about $150 the Nobsound MS-10D is a well constructed and great sounding piece of audio gear.

This little integrated amp is an example of excellent circuit topology combined with good quality parts, and whose wonderful sound  clearly proves the saying: "The whole is  greater than the sum of its parts."  It also has a great sounding headphone circuit
for use with a number of quality headphones.

Highly recommended!
3044106
I wanted to write a quick review on the amp, just to point out that an external fuse is not necessary. There is a small, clear plastic panel is accessible from the bottom of the unit and houses two 40a fuses. Therefore, please be aware of this when choosing an installation location. Secondly, the amp is discontinued, and the manufacturer only hosts the updated PDF manual for the Picasso Nano series (which already has the product removed). Other than that,  I'm a big fan of this amp line. Very efficient, and compact. Quality is great, and have had no issues.  Will update this review as I continue to use it.

UPDATE:
I moved to this amp from a Pioneer GM-D8604 ( 4ch Class-D), and have seen large improvement in the sound quality.  It is currently driving 4 Kicker CS-Series speakers at 100rms without any issues.
4191726
So far sounds great I am using a MTX thunder 3202 amp (400 watts max) and I have a decent deck with 5v sub pre outs I have this in a small sealed truck box and it is in my extended cab 2002 s10 had to turn down the sub in my settings (goes up to 10 and its on 5 now) I have the amp up about 3/4 of the way and it hops plenty for me.  I listen mainly to country so I don't expect to have problems as rap and hip hop is what normally blows speakers (that and of course to much power and or blasting the volume).
2777200
6000 Watts? Not Quite, that is MAXIMUM output bridged at a 2 ohm load. With that said it's still a great amp for the price.
4 Channels A,B,C,D
Each pair A,B and C,D can be either Stereo, Mono (With Crossover or not), Bridged
Mono mode with Crossover enabled = High's to Channel A and Lows to Channel B
Each channel pair can be configured independently.
It's basically 2 Stereo 3000 (Sort of) watt amps in the same case
Sure there is a built in Crossover, but it only works in Mono mode.
The crossover does NOT WORK IN BRIDGE MODE!!! So if your planing on bridging it (like I was) you'll need a separate crossover.
I'm docking it 1 star because of the crossover issue.
I'm using it in my rehearsal space to feed 4 monitor sends.
I'll probably buy another to feed my Yamaha SW118V's and S115V's, bridge it with a crossover.
3333656
Good amplifier if and only if u replace shipped Chinese Shuguang tubes. I change 'em to Soviet 6N1N-EB & Telefunken ECC85, then added a pair of Philips 6AK5-based preamplifier, viola! Conclusion: Shuguang tubes (at these models) sucks
151185
Just got mine. Hooked it up to an alpine 500 watt rms mono amp. Sounds great. Hits hard goes low. Definitely a nice subwoofer
3650029
An outstanding amplifier which combined reasonably high sound quality with high portability.  It is also a very affordable item.  The pre-amp function, dual AC-DC and battery operability are also useful.
3512262
If you're looking for a simple medium power stereo with high quality sound, this would make a great choice.  The distortion specifications are up there with much more expensive receivers.  I've had various receivers over the years and I couldn't be happier with the performance of this little Yamaha unit.
90737
Very, very nice monoblock made with the old style quality that one expects who has been in the car audio scene for a while.  This amp definitely puts out rated power and does it very cleanly.  It doesn't get too hot from normal use and it isn't very draining on the electrical system.  I would recommend having the big 3 done, a HO alternator and a upgraded battery to get full potential out of this beast.
3827339
Great amplifier! I'm using it in bridge mode to drive a large subwoofer (1200 watts rms at 8 ohms) and it has no problem keeping cool or with clipping. There is still plenty of headroom left in bridge mode. I used it in stereo mode to test it out right away with two loudspeakers (500 watts rms each at 8 ohms) and drove them pretty well, even though the amp comes in at 400 rms per channel at 8 ohms. No complaints, just know how deep this amp is, because I had to modify the back of my rack slightly for this to fit. All in all, I will buy again if needed! It would be nice if the fan were thermostatic, but it's not overly loud. I would compare this to a Crown XLS 2502, just a little simpler...and half the price!
3915703
I could not believe that I would be able to hear an audible difference of a class A biased amplifier. I could. I was driving a moderately priced 5" speaker with a soft dome tweeter in good working condition. The bass was tight, something I forgot existed and there was another dimension. There was depth and a for lack words a silvery like tone. That's it, silvertone. I was comparing this amp with a couple of monobloc tube amps, Mc30's. I have these for years driving a couple of 12 " Altec Lansing speakers. Granted, the McIntosh amps are class B. I tried a variety of sources, even my TV and with various types of music. I recommend a quality pre-amp so as to be able to adjust or equalize tone. If you consider wiring an art, these are well done. They weigh 10 kilo and is probably why you do not see more of them.