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Question: Will these power my jbl 4312m sufficiently?  If not can you guys recommend me a good amp for them? Specs for my speakersMaximum Recommended Amplifier Power	75 WFrequency Response	55Hz - 50kHz (-6dB)Nominal Impedance	6 ohmsSensitivity (2.83V @1m)	90 dBCrossover Frequencies	7kHz, 12kHz
Document: Tested: 1) RA LABS BLACK GOLD MINI-REFERENCE (90db/2.83V/1m/6ohm) and 2) MISSION CYRUS 782s (91.5db/1m/4ohm), 3) INFINITY RS1 bookshelf satellites (89db/1m/8ohm). With the volume knob at 50%, there was plenty of power to create realistic acoustic small-ensemble jazz/chamber live performance volume in a 14x17' room, even though the speaker manufacturers recommended 20, 25, and 15 watt minimums, respectively. I suspect the 18-watt A-6000 would be a great step up.
The Grados  are very unforgiving and I have suffered with excessive sibilance and harshness when listening to them through every headphone amp I have owned so far (especially with digital files), except the Bravo V2 (but two of those blew up within a couple months).Headphone amps:-$250 Creek OB-11-$50 CMOY mini altoids amp-$1300 Benchmark DAC1 Pre-$75 EBAY Bravo V2 tube headphone amp (blew two of them up driving the grados- they couldnt supply enough current)After about 6 hours of headphone listening with the Qinpu, I feel it is not as sweet sounding through the Grados as the Bravo was, but better than the solid state headphone amps, and it seems to have more power available so I am hoping it won't blow up due to the Grado's low impedance, high current demands.
Bhatt | "Saradamani" | 180gm vinyl LP | Water Lily AcousticsJohn Renbourn | "Sir John Alot..." | vinyl LP | Nonesuch*Qinpu A-3 specifications from their website:Output power: 2 x 8.5W (8-ohm RMS)Frequency response: 20Hz-40kHz (1dB)THD: less than 1.5% (1kHz)S/N ratio: greater than 71dBCrosstalk attenuation: greater than 45dB (1kHz)Input sensitivity: less than 420mVOverload level: greater than 10VInput impedance: 15k-ohmNet weight: 5.1lbDimensions: 10.25" x 5.5" x 0.433"
I have always wanted an integrated amp that was affordable, featuring some tubes to warm up the sound.Everytime I looked at audiophile magazines the cost of entry was over $2,000. I looked online and nobody offered a reason why a good, efficient low power amplifier had to cost so much.Turns out I was right, it didn't have to be expensive. Thanks to Quipu, the wonderful warm room-filling sound of tubes can be enjoyed by the masses.I have my PSB bookshelf speakers connected to the amp, running a V-DAC from my iMac.
I have 2 of this gem (bought elsewhere); bought one, found the sonic to be so spectacular that I bought another (also elsewhere, didn't know Amazon also sell these babies). This integrated amp replaced my tubed pre and solid state power amp. And despite the traditional wisdom for not driving low sensitivity low impedance speakers, I use it to drive a pair of 4ohm 86db loudspeaker, at 12-1 o'clock volume setting. The sound level is loud enough for my listening. The unit admittedly runs very warm to touch.
Jokes apart this is a serious product. The designer shows his/her extreme craft with this unassuming and inexpensive creation. I have had amps (pure solid state) costing $1000-1500 and none produced the sweet sound of this device. Only other semi tubish device I had was the Peachtree Decco2 with a tube preamp stage and hell it didn't sing nothing like this little guy. It is so simple,it is criminal!My setup -Oppo 105 connected with XLR to RCA cables in stereo down mixed mode.Qinpu A-6000 - stock tubesSwan Diva 5.2 (90dB efficiency and 6 ohm impedance)20x14X9 untreated media room with carpet and painted drywall.
With upgraded tubes, it may get even better. Insane value!If you want the truth and nothing but the absolute truth, get the remarkable Benchmark DAC and Adam A7 studio monitors but if you want music that soothes the soul get this little guy and some efficient full range speakers. This guys lies but his lies tell the truth!Feel free to fill in rest of the audiophile superlatives here _____________________.Negatives:I feel the design is a bit cheesy and could be refined.Some rough edges and panel gaps.RCA and other connectors not good except for the speaker connectors and knobs.Non replaceable and flimsy power cord.Some humming when used as a pre-amp feeding a power amp.Headphone amp not very good with Senn HD650.
There are a ton of reviews on this fun little integrated amplifier out there. So rather than state the obvious and say for the umpteenth time that(1) It sounds great, and even if it cost 5x its current price it would be a winner sound quality wise - provided you value musicality and some warmth in the delivery, and provided your speakers and volume level preferences match the power rating of the A6000. (2) It is a price-value *steal*. Even if you have a far more expensive system, it's fun to get one just to play around.My primary system consists of a Benchmark DAC2 HGC (still to be reviewed) that gets FLACs and some MP3s stored on my computer.
The tubes give a nice warm and rich sound. The binding posts on the rear of the device are also very nicely made. I have also connected my Magnepan 1.6  loudspeakers to this and I was shocked at how good they sounded. For $279, one can hardly complain, but here are a couple of irksome things...  1. It's is difficult to read the markings (volume, cd/I-pod etc.) because the ink used inside the engravings is very light and spotty. 2.
You will need a small hex driver to remove the tube guard to swap out the 2C51, 5670 tubes, whatever. I have tried swapping tubes already, Sylvania, Raytheon, Phillips, mmmmmm, I really dont hear much difference with these inexpensive NOS tubes, honestly. I think the chinese tubes it comes with are very good. Maybe there are more expensive tubes that sound better. who knows? This amp has power too....16 watts a side but it drives my speakers (albeit 90 db) plenty loud.
Answer: It does a great job with my small Klipsch speakers, but the Klipsch are legendary for their efficiency. Not sure how it will do with anything else.