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63 About this deal
Probably because the one amp is the basis for many many amplifier types that all look different when under the bonnet it's just the same SS amp. Read more about the condition New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is applicable). These kits have been put together after many hours of listening tests to confirm the valves performance in any given application.
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. Looks like they keep putting out newer/revised models and actually do a great job of fixing/adding features each year. Those of us at the coal-face (techs, engineers, etc) have a very healthy disrespect for Chinese made products.
From my experience any decent vintage amp/receiver from 70s is much much better then any Chinese class D amplifier. 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. 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. There is only one power transformer under the box, which delivers 17V to output transistors, 7V to microchips and 6. Vintage amplifiers usually have more “fun” in the sound, mainly due to far from flat frequency response and THD levels. Another major problem with filterless Class-D designs such as this Nobsound Bluetooth amplifier is EMI which stands for electromagnetic interference. Sadly unable to use currently and test performance, the item requires an external power source of a voltage I don't have, have to try source suitable power source,, disappointed item wasn't supplied with this important piece of the package to work, item seems robust and solid enough, good quality appearance and build, but until power adaptor sourced unable to judge performance,sad the adaptor not included.The cheapest amplifier with just analogue inputs that I would be willing to risk my money with is probably the 2x100 watt Sony STR130. When connecting long speaker wires, there will be lots of unwanted EMI radiated since this receiver is outputting the high-frequency signal without any low-pass filtering (except for some small ferrite beads). Read more My first unit had a problem with the AUX section and the seller sent a new one immediately. You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice.
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. As such I would bet this amp does not meet the FCC Part rules section 15B which is a requirement by law and as such most likely is even illegal to distribute in the US. New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging . Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. 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.
When manufacturers measure amplifier dirtortion they usually measure distortion by adding a low-pass filter after the Class-D amplifier. There is general consensus in the audio world which of the pins are assigned to a signal as used by HIFIMAN for instance. 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). Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true).
Filterless Class-D amps for the above reasons are usually only used in amplifiers of less than 5 Watts and also designs where the amplifier is mounted directly onto the speaker to avoid EMI issues. They could have very easily been honest and up front with this product, and they would have been successful.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. After being lived in Shanghai for a year, my experiences just put me off that anything is made in china, especially Chinese brand. However, in this case it is safe to assume that the actual distortion that occurs inside the speaker will be magnitudes higher than the specs shown on the Nobsound data sheet since it is lacking the output filter.
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