HiFi Balanced XLR Digital Amplifier Home Stereo Speaker Amp w/VU Meter 300W x 2
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Availability:
In Stock.
Arrives
Thursday, Jul 24
Features
- Stronger output power and RCA output added: use TI's classic power amp IC 3255, each channel can output 300W(4) and easily to drive all 4-8 passive speakers; stereo RCA output is added, easy to connect another amplifier or active speaker / subwoofer to build multiple channel system and enjoy wonderful home theater experience.
- Separate control for left and right channels: two volume knobs are designed for adjusting the left and right channel output indepedently, compensate for the left and right channel of all outputs and prevent the sound field positioning from deviating from the center position. Also with sensitivity knob of VU meter, easy to adjust and match better with different input signals.
- Balanced power amp with VU meter: H7 amplifier integrated with VU meter, not only reproduces high-quality audio with excellent separation, resolution, sound field and clean background, but also dynamically decorates the listening space with strong vintage feelings when its pointer dances in the warm light.
- HiFi clear sound and attractive appearance: support both XLR and RCA inputs compatible with most home audio device; resonable circuit and concise wiring, many high-quality components are used for excellent performance; custmoized grey aluminum alloy case, CNC machined with laser engraving, looks elegant and luxury.
Description
Parameters Model: Douk Audio H7 Audio input: single-ended RCA / balanced XLR Audio output: banana speaker jack / stereo RCA Max output power: 300W+300W (4Ω) Matched speaker impedance: 4-8Ω Frequency response: 20Hz-20KHz (±1dB) Input sensitivity: 0.775V Max output level of RCA: 2V THD: 0.02% SNR: ≥105dB Working voltage: DC 24-48V Dimensions(WDH): 16712842mm / 6.574.961.65in Package dimensions(WDH): 31024070mm / 12.209.452.76in Net weight: 778g / 1.72lb Package weight: 1.4kg / 3.09lb Packing List 1×H7 Amplifier 1×DC 32V Power Adapter 1×User Manual
Package Dimensions: 12.05 x 9.33 x 2.83 inches
Item Weight: 3 pounds
Item model number: H7
Date First Available: October 27, 2022
Manufacturer: Douk Audio
Country of Origin: China
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If you place your order now, the estimated arrival date for this product is:
Thursday, Jul 24
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I have a small remix studio in my home and wanted an average sounding (I.E.- not high end) type of 2.1 audio system that would sound similar to most people’s setups to do A/B comparisons with the studio monitors. After reading a lot of reviews I decided on a pair of 2-way Klipsch B-200 speakers and a Klipsch Sub-100 to handle the low end. A mini amp is what I wanted to power the 2.1 system as I don’t have the extra room for a space hogging, 2IU rackmount style amp that would do nothing more than power a couple of bookshelf speakers. Mostly though, I really did want an average consumer grade setup available to use so I could get a good real world reference sound for when I was doing final mixdowns. Additionally, I wanted to give my beloved (and no longer available) studio monitors a rest when making parts of a song that don’t require a flat tone like sequencing and timing for instance. Note that I refer to using a sound decibel meter in this review. I highly recommend getting one for setting up all your audio. The one I got off Amazon is a:” Protmex Sound Level Meter” for $50. If you go for a different brand, my advice is just make sure it has 3 features: 1. It can be backlit – that’s a no brainer. 2. It can be “A Weighted” which means is simulates what the human ear hears and 3. It can be set to “Fast or Slow” for the decibel refresh rate on the screen. I originally put a Fozi TB10D 600-watt amplifier in my cart and was about to hit order when I decided I would do my due diligence and look around some more. I saw a lot of good reviews on the Texas Instruments amplifier chip (3255) the Fozi TB10D used. It also appeared that the Douk Audio H7 uses this chip as well (they don’t say the actual words “Texas” and “Instruments” just- TI3255. Hmm…). And yes, let’s be real, this isn’t pushing anywhere near 600 watts. The voltage rating on the unit is 24-48 volts but only comes with a 32volt power supply. If I went out and bought a 48-volt power supply to try to get this amp to actually push what its rated for, I wonder if I might need a fire extinguisher handy. This amp has a couple feature combinations that seem to be unique to this one amp in the mini amp price range and it was enough for me to decide to give it a try. 5 features really: 1. First and foremost- it has Balanced Inputs. The next cheapest amp on Amazon that had Balanced Inputs was about $70 more. None of the other cheaper mini amps that I looked at had balanced inputs at all. For the vast majority of us, this feature means nothing. But for studio work it’s an absolutely essential feature and the main reason why I gave this amp a shot. 2. It has 2 completely separate volume knobs- 1 dedicated to each of its 2 channels. Instead of one for both like most amps have. 3. Not a huge selling point here but- it has a VU meter. That’s not a selling point but the fact that it has a completely separate knob to adjust the sensitivity of the VU meter itself is. 4. It has an RCA out for a powered Subwoofer. 5. And last feature is…that it has no other features at all. All of the other mini power amps are full of features: Bluetooth, Vacuum Tubes, USB ports, Tone Controls for Treble and Bass, Main Volume knobs, inputs for computers and optical inputs, automatic dog feeders, flux capacitors etc. etc. On paper all these extra features for that low of a cost sound amazing. On the other hand, at first glance this amp is basic- but that’s the beauty of it. For every quality-questionable chip and board added to those tiny power amps that have no ventilation slots cut into the thick casings or internal fans to help push away heat, it adds to the overall internal heat buildup of the amp. And we all know that heat is an amplifiers kryptonite. With ventilation being non-existent you can begin to understand why the majority of these cheap Chinese mini amps fail extremely quickly. FYI-this amp also does not have any slots cut into the casing on any side for ventilation. It looks like its sealed up so tight that if I were to set it in water- it would float. It has a gold toned VU meter that has a mellow light that looks cool to watch. There is a knob on the amp for adjusting the sensitivity of this meter which is really cool because hardly any other amp allows you to adjust the sensitivity, you just have to hope that it was designed well. After I adjusted it using a steady pink noise it seems to be fairly accurate. Still not much more than something cool to look at but since you can adjust the sensitivity, the VU meter could also be used to show if there was signal dropout using a steady pink noise if there was a problem. Additionally, it functions as a power light (the only light) to confirm that the amp is on. This mini amp is extremely unique with 2 completely separate volume knobs, one for each channel instead of a volume knob that raises both equally. The advantage to having 2 completely separate control knobs is the ability to custom adjust and re-adjust the center stereo image of where your hearing will be. The desk I use as my mixing station is offset with the drawers being on the right side. I have my studio monitors sitting on speakers stands directly adjacent to the desk on either side as they are too big to sit on the desk itself. Since the desk drawers are on the right side, the right studio monitor physically sits 12 inches farther away from my right ear. This means that when I sit at the desk my perceived stereo image for sound is not centered to where I sit, but about 4 inches to the left as my left studio monitor is physically closer to my left ear so therefore slightly louder. This is a big deal when making music while trying to balance a sound as the non-centered stereo image will throw off your perception and can make your mix turn out uneven sounding. On a decent powered speaker, each speaker box itself usually has its own volume knob so you can make offset speaker volume adjustments to recenter the perceived stereo image to your ears by slightly turning up one speaker louder than the other. With a passive speaker system (like what all these mini amps are) you have to depend completely on the amp to have an L/R balance control- if it even has one. Additionally, some of these balance controls leave something to be desired and attenuate the signal unevenly and I have found I get much tighter stereo imaging by slightly changing the volume level on one speaker then using a balance control that affects both. The ability to readjust where the stereo image center is with 2 separate volume knobs would also come in handy for those people who enjoy entertaining others. It would be useful for re-centering the stereo image to be in a certain area of your backyard or centered over the bar for your kitchen or for working/gaming at a desk for instance. This amp should be considered a “set and forget” style amplifier- after you set it up, you should never need to touch the amp again. You would use a separate DAC as a main volume control and EQ and never mess with the 2 volume knobs you set. Most importantly though- it has Balanced Inputs. For those that are unfamiliar, a completely balanced signal (on both ends) rejects electrical interference that occurs in the audio signal as it passes down the audio cable helping to stop distortion, hissing and buzzing coming from your speakers. For the majority of us, we are just listening to the music so even though things like hissing coming from your speakers is an annoyance, you know it’s your equipment and not the music itself. But when you’re making the music- hissing and buzzing are a substantial problem to deal with because the last thing you want to do is to accidentally record distortion caused by your equipment permanently onto the song you just worked so hard to compose. So, getting a clean signal is the name of the game. Balanced equipment along with quality balanced cables is a must have. How it preforms: The casing fit and finish is good quality overall. I couldn’t find anything to complain about here (except of course, the lack of vent slots). The knobs are notched but can easily be set in between each notch so no big deal. I wanted to put it through its paces and ran speaker hiss tests. The first was to give it a less than perfect setup to see how well it would do. The audio was coming from a decent mixer and a low quality 20’ long RCA cable directly to the amp with no music playing. Standing 2 feet from the speakers I was able to turn the amp up to just 35% of the total volume before I could make out an audible hiss. To be honest, it was kinda what I expected. On the second test I used a new, shorter 12’ mid-grade RCA cable connected directly to a studio grade audio interface (I use a MOTU M2) and repeated the speaker hiss test. To my surprise, when I slowly turned up both volumes all the way to 100% I heard absolutely no hiss coming from the speakers at all. Note that the only difference was the quality of the (unbalanced) audio signal that the amp received, nothing else. I pulled out my sound decibel meter to confirm what I “wasn’t” hearing and sure enough- no change whatsoever to the meter when I turned the volumes all the way back up to 100%. I even put the meter 1 inch from each speaker and still- crystal clear. No hiss at all. This means this cheap amp did not introduce any sound coloration to the audio signal- it’s totally transparent and just makes it louder. Nice! Repeating the test using actual balanced cables gave me the result I had wanted and expected- also no speaker hiss at 100% volume. Note that the lack of speaker hiss can also be attributed to the fact that the power for the amp is supplied through a studio grade power conditioner/surge suppressor that also conditions the power line as well as stops surges so this amp only gets clean power. It’s not just plugged into a $5 surge suppressor I got at Walmart. Now as far as distortion of the music while its playing at loud volumes; just like the vast majority of amplifiers ever made, when you crank the volume up with music playing it will start to distort the music well before the volume knob gets to 100%. However, I don’t hear anything at all until about 85% total volume which is outstanding for a cheap mini amp. I have old amps that can’t get past about 40% volume before they start to sound distorted. For it to have no speaker hiss at 100% volume and undistorted music until about 85% is way beyond what I had expected this amp to be able to do. How does it sound? I listened to my favorite songs that I know every tone for to test for differences. Overall, it sounds great. I notice a slight raise in the highs past about 3khz but that was about it. Not muddy at all, crystal clear. It’s not even warm to the touch even after running for a while but no slots in the casing for venting really does bother me though. Thermal overload will probably be what takes this amp out. The one thing that all those 30 and 40-year-old amps that our parents handed down to us have in common is the huge number of venting slots in the casing on all sides, top, bottom and back. And every time you cranked up those old amps and they shut off due to thermal overload, you knew that in a minute or two that old amp would come back to life and you could carry on thrashing it. With these feature laden, tightly packed mini amps that have no provisions for cooling at all- I seriously doubt that will be the case. Come on Douk Audio, can’t you at least cut in some venting on your amp cases? It would make a huge difference in dependability. The first time this amp thermally shuts down- if it doesn’t nuke the amp- then Im going to get the Dremmel out and cut some vents in myself. I also preemptively bought some dual usb powered fans on Amazon (AC Infinity MULTIFAN S5, Quiet Dual 80mm USB Fan) that I will use with some double sided Velcro to strap them to each side of the amp. One pushing air in, one pulling it out. Like a category one wind tunnel sandwich. Note that this system will be used in a “near field” monitor situation where the speakers would be placed about 3-4 feet from my ears so pushing the amp hard to have the loudest possible sound was of no interest. Instead, since this amp will be used at a set level, what’s most important to me is how many clean decibels of music I can get at the distance that I will be listening to it at. I used my sound decibel meter placed exactly at where my head would be looking at the computer screen to get a baseline reading from my studio monitors of 72-76db as an average volume level I like to listen to music at. 87db (at 4 feet from my ears) is as loud as I wanted this new system to go when I wanted to do some air guitar or robot to a song that I was jamming out to. I set the volume of the audio interface to as high as I would ever turn it up. Then playing a constant pink noise through the system, I panned the audio signal balance hard left then right and slowly turned up each separate volume knob on the amp until my sound decibel meter read about 87db as an average level of sound coming from each speaker. Once each speaker was set, playing them together made for a perfect stereo image right where my head would be. Why did I just mention all of this? Because in order to achieve an average of 87db of sound coming from the amp I had to turn the amp volume knobs up to only 50% of what they are capable of. Remember what I said about having no distortion until about 85% volume? This is well beyond my expectations. This also means I won’t be pushing the amp hard. So less overall power needed hopefully means a much longer survival rate for this amp that has no previsions for heat dissipation. For me, this amp will see an average use of 5-7 days a week from 1-6 hours a day so I will know very quickly if it’s truly a quality piece or just a total POS. I promise that no matter how long this amp lasts (3 more hours or 3 years) I will return to this review for an update on how it faired. PROS: Balanced Inputs. If you make music, those words speak for themselves. Introducing a high-quality audio signal in, will give you a high-quality signal out with no added hiss or sound coloration. Even when using the unbalanced RCA inputs. No additional unneeded features (I.E.- no extra liabilities). 2 separate volume controls for precision tuning of the stereo image. External build quality appears to be excellent. I used banana plugs but noted that the holes for using bare speaker wire were nicely offset from each other (positive/negative) and it wasn’t too much trouble to install speaker wire even though all the standoffs were placed very close to each other. CONS: no previsions for heat dissipation is the really big one Notched knobs but- they are still tunable between each indent. So really, no big deal. I can’t speak for the quality of the internal components but so far so good. Lastly a quick note on shipping: at the time I bought this, Amazon stated 1-2 months before the unit would usually ship so I went to the Douk Audio website and ordered it directly through the company. They shipped it via “4X” a kind of UPS or Fed EX. The English translation for the shipping updates was not so good and some of the updates were amusing to read. It took about 2 weeks coming from China to get to me. It was taped up so well I almost needed a chainsaw to open the box. No damage. Getting it from Douk was easy just make sure to use the coupon codes they give you on the webpage so it’s cheaper and pay the extra $4.99 for shipping costs so it doesn’t end up in limbo somewhere. But if Amazons shipping ETA has improved I recommend ordering it directly through Amazon simply for the piece of mind. I took a big risk to try this amp out and it seems to have really paid off. Affordable gems can still be found and so far, this is a great *balanced* mini amp to use in a studio to give you a real-world test for your mixes and if you set it up right, with realistic expectations- you won’t be disappointed. Hope this review helped!
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Reviewed in the United States on December 30, 2022 by Humble