EMB EBK-37BT 700W Rack-Mountable Karaoke Mixing Amplifier. Please read our terms of business. EMB EBK-37BT 700W Rack-Mountable Karaoke Mixing Amplifier Well, what would you like to know about this unit? It’s a karaoke microphone mixer/amp. It does the job quite well at a decent price… Somewhat of a bland description, I know, but karaoke mixers do… I was really worried about the qualities after reading the reviews. Here is my review. External: Good build qualify. Solid steel case with convenient handle which also protect the panel various buttons. Plastic panel is protected by film and stick solid without problem. Power Output: The power output listed in user manual is maximum 120W/channel, but I think the power is much more than enough as home used amplifier although I don’t know if it has peak 700 watt as the title. Compared to my Sony DH740 with 145W x 7, EMB Pro’s power output in each channel is much more powerful. So maybe the title is correct. Some earlier reviews complained the power is very small and almost no sound. It is probably due to a feature of this machine becoming a trap. There is a volume reset to zero when power on function, which is on by default. So if you preset the volume and move to stage before the performance, the volume will reset to zero when you power it on. A switch behind for this can set the feature to off. I was trapped by this in the beginning. AC Noise: AC noise is my another concern for some low end amplifier from my past experience of building audio amplifier myself. This one is clean. But here is another trap. Because it is built as steel case including the panel, a 3 prong power cable is used in contrast to normal 2 prong power cord used in consumer amplifier. This design has no problem but a risk of ground loop can be built up when you construct your audio system which will introduce significant AC noise. In my case, my desktop with 3 prong power was built into my audio system thus formed ground loop with this new amplifier and introduced big AC noise in the beginning. With a fake ground connector added, ground loop is removed and noise is got rid of. This is absolutely not the product issue but your system building attentions. Fan noise: No, probably no fan is used although the hole looks like a fan. I did not stare in to check because it does not bother me at all. Sound qualify: Very good, no distortion. Three band equalizers work very well. Vocal delay/repeat works very well although delay amount looks in reversed direction but is really minor issue. You can adjust vocal equalizer and different delay band to realize the best singing result in very precise degree. This is the major reason people need this type machine in additional to 7.2 amp. Tone up/down function works but no good result. This is the only bad point I noticed in this product. The tone change processing result is bad although you can still sing with it. Fortunately this is not a big issue due to first tone change is rarely used function in normal Karaoke singing, and 2nd almost all Karaoke source has tone up/done functions which is a cleaner way to do in digital domain before it is converted into analog signal making it much harder. The master volume and music volume are all control line level. The design is supposed to be music volume controls line level and master volume controls the power amp output without affecting line output. But they are both affecting the line output level. I connect the line output to my 7.2 amp and hope the master volume in both amp can control independently to change power ratio of them. But I can only change 7.2 amp volume to change the power ration as this limitation. It’s not that noisy you have to expect a little hum but again I think it’s a problem with their hook up to the speakers and other things they may have on the amp that they say it’s noisy, to me it is not and I use it at home. This amp though it’s not a 700 watt as advertised, even in the booklet it says 100 watt, this unit does push big sound. I have two Podium Pro 1200 C speakers (500 watts rms per pair & 1000 watts max per pair at 8 ohms), and this amp handles them just fine. I use it combined with my Cavs 203G usb karaoke player works great. Basic Terms: Item Condition All items are new, open box, lightly-used, or for parts. Their condition is prominently stated. They can also be different for various categories of products. This can be confusing. We use the term, “new, open box” to describe items which have not been used (but may have been tested) and either the factory seal has been broken or there was no factory seal. If there are multiple items for sale, the photos will be illustrative. Most boxes/items which are sealed when we get them will remain sealed. Sealed boxes which have fragile components glass, ceramic, etc. Are selectively opened for inspection. As much as practical, all items are cleaned/inspected/tested before they are listed for sale. Items might have minor blemishes, scratches, etc. Items with mechanical components, such as coffee grinders, might include a small amount of reside from testing. Items which use water, such as pumps or coffee makers, might include a small amount of water from testing. Support items such as electrical cables and power adapters might not be original. Original packaging, literature, and non-critical items such as stickers may be missing and/or damaged. If necessary, we add padding and/or extra corrugated panels to meet or exceed the structural integrity of the original package. Fraud/tamper detection is used on select items. 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