![]() ![]() Add some used 'eBay special' floorstanding speakers and shell out on a decent-ish used centre speaker with the rest of your budget. Try to find one where the rear channels are not considerably under-amped as this will make a big difference with movies. Ideally? Something 2-5yrs old with 3 or more HDMI inputs, 5 direct speaker outputs, a subwoofer pre-out and try to get something from someone like Yamaha, Sony, Onkyo or similar. ![]() You have $300 and should be able to get something well within the bounds of workable for half that or just below, particularly if it's local and for pickup only. ![]() In your situation, I'd buy a used 5.1 AV amp from eBay to start. I would relegate it to other duties, return it or sell it. I do say this without intending to upset or provoke and I do love Bose kit for clarity and reproduction - it is a 'good' system. Removing their speakers and attaching them to the AV reciever would likely give a poor sound. Bose stuff is designed to be a closed ecosystem and whilst the quality is high, the amps and speakers are highly tuned to each other. Sadly, as you've already purchased the Bose system, you've kinda started on that road and it's immensely difficult to get that to play ball well with an AV reciever. As a side note, I know 'good' is a perception but when I refer to that I mean a reasonable amount of volume (enough to bother the neigbors - not that I intend to), sufficient quality to hear fairly accurate sound reproduction (I'm not talking audiophile levels - just roughly level tonal response without crackling) and (for me) decent seperation in terms of sounds in my 5.1 system being placed roughly where they should, especially when using DTS input like blu-ray or similar. I've been doing 'good' AV on a budget for a while now and would advise a slightly different route. I would also suggest trying a different RCA - 3.5mm cable as that's often an issue, preferably of a different design to ensure it seats differently (hopefully properly). You can purchase an analog - digital converter but that's overkill really and my not resolve the buzz/hum. Really we need to know what connections the TV has and similar for the stereo kit. If you connect the output with DC offset directly to the coils of the transformer a DC current will flow in the coil that may or may not affect the way the source behaves.You can easily and simply buy an RCA ground loop isolator which (in conjunction with the RCA - 3.5mm cable) should solve the hum. Most audio sources should have these AC coupling caps on their outputs anyway (so their average output voltage is not biased at some DC voltage), but once in a while you have a source that has a DC output offset. So if your load is 5K Ohm, adding the isolator in front of it, the source still sees a 5K Ohm load impedance.Ī couple of important things to note: The input side (the male RCA at end of cable) has DC blocking capacitors, so it is a good idea to make sure to not reverse the input and output. It uses 1:1 audio transformers therefore it does not change the impedance. The isolated output is automatically AC coupled and has no bias. In order to isolate this Bias level from the transformer coils, DC blocking capacitors are employed by the GLI-RCA. Some audio source equipment may have a certain DC bias voltage on their audio output connectors. The input side incorporates DC blocking capacitors. In most cases the unit can be used in either direction, however it is designed so that the male RCA connectors on the molded cable are used as input and the female RCA connectors on the box are outputs. The unit is simply inserted in series with the audio and it literally eliminates the ground connection between the two sides, passes all the audio while filtering out any noise using high performance audio transformers. Line-level audio is a very tiny low-level signal, so any noise in AC ground, even as little as 0.004v, will be quite audible - yuck! ![]() On the other hand unbalanced signals, such as the one coming out of consumer equipment, have no reference other than building/AC ground. Any noise in the ground between the source of the Audio and what it is connected to is automatically ignored. Professional equipment have balanced audio which uses a + and a - signal for each L/R side and therefore does not rely on ground. Uses proprietary audio transformers and filters for total elimination of any spurious buzz and hum in the audio.ĭo you hear hum or noise in your audio setup with certain inputs? Most people would answer yes, and that's because in most installations the audio signals are not balanced. Perfect frequency response of +.03 db from 20 to 20,000Hz. Eliminates ground loop noise between any audio source such as DVD player, MP3 player, or notebook PC and audio equipment. Stereo Audio Ground-Loop Isolator & Filter with RCA connectors. ![]()
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