In other words you are likely to damage the speaker voice coil by driving a speaker with such a signal. The cheapest amplifier with just analogue inputs that I would be willing to risk my money with is probably the 2x100 watt Sony STR130. Just check out Audio Space, Cayin, Prima Luna, Consonance, Mingda, Doge and Line Magnetic are all excellent.

C: An early production unit may have been designed with a swap and a (siltently) revised PCB has been used after the manufacturer found out. The second picture shows the measured output signal with no speaker load attached while streaming silence. Where does the signal on the cathode 6n1p and on the cathode and anode 6p15p comes from, if the signal comes on the 6n1p grid only when tubes are removed? Another major problem with filterless Class-D designs such as this Nobsound Bluetooth amplifier is EMI which stands for electromagnetic interference. Read more My first unit had a problem with the AUX section and the seller sent a new one immediately.The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products. The inlaws makes a request to families in HK and then it gets taken across the boarder, just don’t get caught with quantities otherwise customs will either confiscate or make you pay import duty. Read more about the condition New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is applicable). The fact is that most speakers will exhibit fairly high eddy losses at those switching frequencies used by Class-D amplifiers.

First of all, every speaker handles high-frequency signals differently since a speaker is designed to be driven with signals at frequencies below 25 kHz. Given the fact that the connectors aren't hand wired and are soldered onto the PCB correctly this leaves a few conclusions.

Me and others were not so lucky, I can only conclude there is very little quality checking on these. When I brought this to their attention, they sent me a new faceplate with "Nobsound" on it but no "E-600. This is interesting as I used a signal generator with my standard HD650 XLR-4 cable and looked at the phase on my Rigol DS1054 oscilocope and pin for pin the input and output are in phase. The audio is detailed and transparent and quite revealing that my Mordaunt Short MS15 speakers, although lacking a bit of bas. This results in a strange stereo image where bass is affected and voices and instruments cannot be placed properly, a fuzzier stereo image.

A circuit diagram is very difficult to draw, because the circuit is on both sides of the board and the details are too small. It all started with those counterfeit semiconductors which appeared at around the same time as Chinese made valves (around 25 years ago). Rubbish Chinese amps like this one are getting rarer - the majority of them now have excellent build quality and aspire to be a hi-end product. I can safely say, 100% goods sold are fake (not cheap) and they do it openly, and authority don't care. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising.They could have very easily been honest and up front with this product, and they would have been successful.

The amp and speaker combination works really well with jazz/folk/accoustic music but can get a bit muddled with complex music like rock or orchestral music. Class-D amplifiers work by switching the output between ground and the supply voltage at a high frequency. There was reported that Russian tubes sound much better, and the tubes with golden grids make the best sound. Afghanistan, Albania, Algeria, American Samoa, Andorra, Angola, Anguilla, Antigua and Barbuda, Argentina, Armenia, Aruba, Australia, Austria, Azerbaijan Republic, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Bosnia and Herzegovina, Botswana, Brazil, British Virgin Islands, Brunei Darussalam, Bulgaria, Burkina Faso, Burma, Burundi, Cambodia, Cameroon, Canada, Cape Verde Islands, Cayman Islands, Central African Republic, Chad, Chile, China, Colombia, Comoros, Cook Islands, Costa Rica, Cyprus, Czech Republic, Côte d'Ivoire (Ivory Coast), Democratic Republic of the Congo, Denmark, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Ethiopia, Falkland Islands (Islas Malvinas), Fiji, Finland, France, French Guiana, French Polynesia, French Polynesia, Gabon Republic, Gambia, Georgia, Germany, Ghana, Gibraltar, Greece, Greenland, Grenada, Guadeloupe, Guam, Guatemala, Guernsey, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, Hong Kong, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Japan, Jersey, Jordan, Kazakhstan, Kenya, Kiribati, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Macau, Macedonia, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Mexico, Micronesia, Moldova, Monaco, Mongolia, Montenegro, Montserrat, Morocco, Mozambique, Namibia, Nauru, Nepal, Netherlands, Netherlands Antilles, New Caledonia, New Zealand, Nicaragua, Niger, Nigeria, Niue, North Korea, Norway, Oman, Packstation, Pakistan, Palau, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Puerto Rico, Qatar, Republic of Croatia, Republic of Cuba, Republic of the Congo, Reunion, Romania, Russian Federation, Rwanda, Saint Helena, Saint Kitts-Nevis, Saint Lucia, Saint Pierre and Miquelon, Saint Vincent and the Grenadines, San Marino, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, South Korea, Spain, Sri Lanka, Sudan, Suriname, Svalbard and Jan Mayen, Swaziland, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Turks and Caicos Islands, Tuvalu, Uganda, Ukraine, United Arab Emirates, United States, Uruguay, Uzbekistan, Vanuatu, Vatican City State, Venezuela, Vietnam, Virgin Islands (U. After being lived in Shanghai for a year, my experiences just put me off that anything is made in china, especially Chinese brand.Update: I just read Veri's and others' earlier comments in this forum re the poor performance of this amp. I can understand them skimping on transformers which are costly devices, but the rest of the chassis is full of circuit boards, so why not just make a proper valve amp out of it to begin with? Finance is provided by PayPal Credit (a trading name of PayPal UK Ltd, Whittaker House, Whittaker Avenue, Richmond-Upon-Thames, Surrey, United Kingdom, TW9 1EH). We have over 30 years' experience with using and listening to high end audio amplifiers and over 25 years in improving the valves. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.