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Post by ilikeitloud on Dec 8, 2023 18:30:17 GMT -5
I received my MR1L yesterday and I would like to connect my turntable. I have a preamp but I noticed that there is no ground connection on the receiver, is it possible
to use one of the chassis screws for this purpose? Also what is the purpose of the bluetooth antenna if I cannot send music from my phone via bluetooth?
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KeithL
Administrator 
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Post by KeithL on Dec 9, 2023 3:26:29 GMT -5
On the receiver, chassis screws, black speaker terminals, and the outside shields on any of the RCA connectors, are all grounds. (Note that the black coating we use is quite tough so you will want to scrape the metal bare under the screw head for good contact.)
Also note that the interconnects actually provide a ground path between the phono preamp and the receiver already.
Adding another ground may reduce hum... or may actually cause it to increase. And because of the really low signal levels involved...
And because turntables and phono preamps can be grounded in several different ways...
You may have to simply try various combinations to find out which one works best the combination of gear you have... And you may possibly get the least hum without a separate ground from the phono preamp to the receiver.
However, if your phono preamp has a ground lug, your turntable should probably be grounded to that.
If you're at all new to this then you should know that the cartridge in your turntable and the interconnects going to it are VERY sensitive to hum. This means that the physical location of the turntable, and which way it is facing, may make a major difference. (Sometimes simply rotating a turntable 90 degrees or moving it a foot will get rid of hum.) Likewise, the low level interconnects between the cartridge and the preamp should NOT run near power cables or pass near big transformers.
Also... our Bluetooth implementation is pretty standard so you should be able to send to it from your phone.
I received my MR1L yesterday and I would like to connect my turntable. I have a preamp but I noticed that there is no ground connection on the receiver, is it possible to use one of the chassis screws for this purpose? Also what is the purpose of the bluetooth antenna if I cannot send music from my phone via bluetooth? |
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Post by ilikeitloud on Dec 9, 2023 7:06:04 GMT -5
Thank you for the prompt response Keith, I never thought about using the negative speaker lugs as a ground but good to know. If I were to use a chassis screw, will this in any way void my warranty?
As far as bluetooth goes, I cannot seem to find the MR1L when doing a bluetooth scan with my phone so I can pair the devices.
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Post by AudioHTIT on Dec 9, 2023 14:55:45 GMT -5
I received my MR1L yesterday and I would like to connect my turntable. I have a preamp but I noticed that there is no ground connection on the receiver, is it possible to use one of the chassis screws for this purpose? … … However, if your phono preamp has a ground lug, your turntable should probably be grounded to that.… ^^^ This is what works best for me, a separate ground wire from the turntable to phono preamp, but none from phono pre to analog input (try this before messing with your MR1L). |
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Post by vcautokid on Dec 9, 2023 19:02:54 GMT -5
Yep the differences in ground potential make fine noise hummers.
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Post by ilikeitloud on Dec 10, 2023 11:02:19 GMT -5
I did get the Bluetooth to function, it was inactive in the menu.
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KeithL
Administrator
Posts: 10,256
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Post by KeithL on Dec 11, 2023 12:42:59 GMT -5
No... using a chassis screw as a ground point will NOT void your warranty. To be quite honest I would expect the negative speaker terminal to NOT be a good choice... but it might work well. As for Bluetooth... make sure you have that input selected on the MR1L when you scan for it (and I'm not sure exactly how it will identify itself)... Other than that it should work. Thank you for the prompt response Keith, I never thought about using the negative speaker lugs as a ground but good to know. If I were to use a chassis screw, will this in any way void my warranty? As far as bluetooth goes, I cannot seem to find the MR1L when doing a bluetooth scan with my phone so I can pair the devices. |
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Post by ilikeitloud on Dec 11, 2023 20:29:16 GMT -5
No... using a chassis screw as a ground point will NOT void your warranty. To be quite honest I would expect the negative speaker terminal to NOT be a good choice... but it might work well. As for Bluetooth... make sure you have that input selected on the MR1L when you scan for it (and I'm not sure exactly how it will identify itself)... Other than that it should work. Thank you for the prompt response Keith, I never thought about using the negative speaker lugs as a ground but good to know. If I were to use a chassis screw, will this in any way void my warranty? As far as bluetooth goes, I cannot seem to find the MR1L when doing a bluetooth scan with my phone so I can pair the devices. I did get the Bluetooth to function, it shows up as MR1L. I have not connected the turntable yet but I will just use the ground on the preamp. |
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Post by mgbpuff on Dec 12, 2023 8:17:35 GMT -5
Do not ground the negative speaker lug ever. Although it 'may' work, as Kieth said, you must know your amplifiers circuitry as some (probably most) cannot be grounded. In case you change amps, the best policy is not to ground the negative speaker terminal.
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KeithL
Administrator
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Post by KeithL on Dec 12, 2023 11:07:22 GMT -5
I have to offer a bit of an editorial comment here... Let me start by saying that I absolutely DO understand the massive benefit to using Bluetooth - in terms of convenience (I use it in my car). However I'll admit to being a bit perplexed about the philosophical justification for a turntable with a Bluetooth output. Many audiophiles favor vinyl because it is "totally analog" - which they apparently believe "sounds better than digital". I disagree with this, and I think the specifications - as well as my personal experience - support my point of view, but a vinyl album played on a turntable is definitely "pure analog". However, as soon as you look for a digital output from a turntable, you are now passing that analog signal through an analog-to-digital converter (an ADC). And, to be quite blunt, all of the variables and questions that apply to DACs also apply to ADCs, yet those questions are rarely talked about with digital outputs on turntables. Instead you get a full page about the bearings, and the motor, and the tonearm... and then "Digital Output - Yes 24/96k"... I've yet to see any more detailed specs about the ADC in a turntable with a digital output. (I don't think I've ever seen anyone offer a detailed review on the digital output from a turntable let alone discuss which ADC chip it uses or the specs of its conversion clock.) And, if you add Bluetooth to that signal chain, you are adding encoding that signal into a lossy format, and then sending it via short-range radio. In other words, you are taking that "pure analog signal", obtained by one of the least convenient processes possible... And then, on top of that, subjecting it to just about everything you probably don't like about digital audio... To me that feels a lot like one of those contests where the goal is to launch an egg, on a rocket, and then land it safely without breaking it... (Or that famous motocross challenge, from a long time ago, to deliver a big block of ice across a desert, with no powered refrigeration allowed.) Now, to be fair, I do get it for people who have a huge collection of stuff on vinyl that just plain isn't available on digital media... And I also get that some people are just plain nostalgic for the feel of vinyl albums and those pretty record sleeves with their nice detailed notes... But, to me, playing vinyl via Bluetooth just seems like a really long way around... (You still have to walk over to the turntable to put the record on and lower the arm... it's not like you can carry that turntable around in your pocket...) No... using a chassis screw as a ground point will NOT void your warranty. To be quite honest I would expect the negative speaker terminal to NOT be a good choice... but it might work well. As for Bluetooth... make sure you have that input selected on the MR1L when you scan for it (and I'm not sure exactly how it will identify itself)... Other than that it should work. I did get the Bluetooth to function, it shows up as MR1L. I have not connected the turntable yet but I will just use the ground on the preamp. |
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Post by ilikeitloud on Dec 13, 2023 5:56:54 GMT -5
I am not using Bluetooth for my turntable, it is not even capable of doing so. I stream Pandora.
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KeithL
Administrator
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Post by KeithL on Dec 13, 2023 9:30:06 GMT -5
Good... I wasn't specifically sure whether you were or not... I just saw it mentioned in the same thread as connecting a turntable. However, what provoked my "editorial comment" was that I am noticing that Bluetooth option on a few new turntables. (As I said, that was just an editorial comment about people who claim to want "the analog sound of vinyl", and don't seem to notice that they've left it behind long ago. To be honest I am not a big fan of any streaming... but it is the way things are going... It sure is convenient... and I use it myself for "casual listening". But I don't think that MOST people who use streaming, or Bluetooth, are actually aware of the limitations of both... (Not to be snarky but, if I had my druthers, as the saying goes, "nobody would use the words 'audiophile' and 'Bluetooth' in the same sentence".) I am not using Bluetooth for my turntable, it is not even capable of doing so. I stream Pandora. |
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Post by AudioHTIT on Dec 13, 2023 20:45:15 GMT -5
However I'll admit to being a bit perplexed about the philosophical justification for a turntable with a Bluetooth output. I have seen these in the past and racked them up to 'vinyl for cool factor' users. I was surprised recently to see JBL (a mostly reputable brand) with a Bluetooth turntable, but see they tout it's ability to connect directly to Bluetooth headphones (probably their BT speaker line too), and that their BT is AptX-HD (TM). So, as it's a reasonable price, I guess I can understand serving a market that really does value convenience and simplicity (but generally agree with you). |
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