MODX8 to Yamaha HS8s - "Buzz" in Speakers

Covers the Yamaha MODX6, MODX7 and MODX8

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MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by parametric » Sat Jan 19, 2019 2:41 am

A Mate of mine has just bought the MODX8 and a pair of Yamaha HS8s from Yamaha's London Shop.

Delivered on Wednesday, when he set it up and switched on, there was a significant BUZZ from the Speakers,

with the volume levels on the Speakers set to about 50%.

(Simple connection arrangement - MODX L + R outputs to HS8 inputs . . . . )

He was sold a pair of quality cables to connect these up, and from his description, they are TRS . . . . .

The MODX has TS outputs - hasn't it? - So why was he sold TRS Leads? (more expensive - perhaps?) :roll:

He wondered if the cables were the problem and returned to the Shop, where the assistant tested them.

This he did by approaching a potential customer who was trying out a guitar -

and swapping out the lead for one of my Mate's leads. :o :o :o (NOT very professional IMO) :roll:

Am I "behind the times" here? - But I thought Guitar Leads were TS? (except some special cases . . . . )

Cables were declared fit for purpose - and my Mate went home a tried again - NO Change . . . .

I am thinking that the third wire in the TRS leads is "floating" and acting as an aerial, perhaps

So he's returning the lot to The Yamaha Shop in hope of reproducing the fault there . . . .

Despite widespread opinions that TRS and TS are largely interchangeable - and will work in most cases,

I think in THIS situation, TS Leads should be used.

I have always considered it best to use the correct cables for the job in hand to avoid unexpected "issues".

The HS8s have TRS inputs, but claim to work OK with TS, although, these should be "as short as possible".

Anyone else had this BUZZ problem? - Was there a solution in the end?

parametric
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by Saul » Sat Jan 19, 2019 11:16 am

I don't think I would have "tested" the lead with a guitar! 8O What happened to customer service at Yamaha Music London? Why not go and plug it into a MODX and HS8? THEN they could say it's not the cable!

I doubt it would be the HS8's themselves. The chances of having two faulty speakers together is incredibly low.

Could be an issue with the MODX8 but as the cables are the easiest things to check of course they would be first on the list.

Has your friend tried plugging anything else into the HS8's with the same cables?
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by parametric » Sat Jan 19, 2019 3:14 pm

Saul wrote:
Sat Jan 19, 2019 11:16 am
I don't think I would have "tested" the lead with a guitar! 8O What happened to customer service at Yamaha Music London? Why not go and plug it into a MODX and HS8? THEN they could say it's not the cable!
Indeed. He tells me he will taxi the whole bundle back to the shop in due course for them to check.

If the fault remains - then I guess they'll replace the MODX8 (I too doubt it's the Speakers).

However, if the system is quiet - then he has to look at the possibility of a bad Mains supply back at home?

A bad Earth somewhere - perhaps?
Saul wrote:
Sat Jan 19, 2019 11:16 am
I doubt it would be the HS8's themselves. The chances of having two faulty speakers together is incredibly low.

Could be an issue with the MODX8 but as the cables are the easiest things to check of course they would be first on the list.

Has your friend tried plugging anything else into the HS8's with the same cables?
I know for a fact he has no other gear with 1/4" Jacks at that address, so that check is not possible.

He does have a FantomX8 and active Speakers of unknown make at another address, but it''s not local . . .

So he will await the Checks at Yamaha London . . . .

I'll post the outcome when I hear . . . .

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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by pax-eterna » Sat Jan 19, 2019 3:46 pm

Using TRS cables will cause this "buzzing", more like a mild distortion noise really. Only use TS cables with the MODX.
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by parametric » Sat Jan 19, 2019 3:59 pm

pax-eterna wrote:
Sat Jan 19, 2019 3:46 pm
Using TRS cables will cause this "buzzing", more like a mild distortion noise really. Only use TS cables with the MODX.
My feelings entirely . . . . . Thanks for that, PE . . . . I'll pass it on . . . . . (Y)

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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by parametric » Sat Jan 19, 2019 4:06 pm

Just spoke to my Mate . . . .

He's on his way back to Yamaha London with his gear . . . .

From what <PE> said, I'm increasingly of the opinion that the problem is due to being sold the WRONG LEADS?

I don't think it's unfair to say that this should NOT HAPPEN at the Flagship Shop.

I would expect the Sales Team to be Technically "Savvy" - not merely Shop Assistants . . . . :naughty:

Stay tuned . . . . .

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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by pologuy » Sat Jan 19, 2019 5:46 pm

parametric wrote:
Sat Jan 19, 2019 2:41 am

I have always considered it best to use the correct cables for the job in hand to avoid unexpected "issues".
This...
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by Saul » Sat Jan 19, 2019 6:03 pm

I agree with you Chris. At some stores we might expect "sales assistants" with less than great knowledge but at Yamaha Music London that should simply never happen.

This is a LOT of messing about for your friend and I hope they have the common sense to compensate him in some way.
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by parametric » Sat Jan 19, 2019 6:10 pm

Well, I don't know how competitive the pricing is at Yamaha's HQ Shop, but I would have thought a spend of around

£1800 should warrant some sort of gesture? . . . . . (No - NOT that one . . . :lol: :lol: )

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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by Saul » Sat Jan 19, 2019 6:41 pm

Ha ha, well personally I rarely look to Yamaha Music London to buy anything because their prices are mostly a lot higher than elsewhere. Probably the overheads of a large store in the centre of London doesn't help!

Occasionally they have deals that work out to be very competitive but they are far and few between so...if you are paying top money the least you can expect is top service?
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by parametric » Sun Jan 20, 2019 3:03 am

My Mate returned back home with his Gear -

It all checked out OK at Yamaha just fine. He was seen by a tech support guy, who was "Very Pleasant" . .

So kudos there . . .

The supplied leads WERE in fact TS (My mate was confused by the difference I had explained).

So it looks like the problem may be in HIS domestic supply . . . .

I suggested he tries a filtered trailing multiway - or even a filtered socket in place of his resident one.

Beyond that, his Electricity Provider should check his installation . . . . ?

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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by Saul » Sun Jan 20, 2019 2:50 pm

Ok well that at least rules out the MODX, the HS8's and the leads. Good to hear Yamaha Music London checked everything out for him.

Always going to be a problem tracking down the source of speaker noise if you don't have any other means of testing things.

It could be the leads or speakers are picking up noise from other nearby devices such as tv, refrigerator, central heating, lighting and so on. A good power filter should sort that. I would really want to trace the cause though rather than mask the symptom. If he has any dodgy wiring he definitely needs it investigated. Maybe get an electrician to check the wiring just to be on the safe side?
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by EXer » Sun Jan 20, 2019 5:04 pm

Some hints about connecting an unbalanced output to a balanced input (Genelec website) :

https://www.genelec.com/electronics-and-cabling#qid-925
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by pologuy » Tue Jan 22, 2019 7:26 pm

So you can't/shouldn't use the MODX with the JBL line of studio monitors?

Because the JBL studio monitors have a TRS input and not a TS input...
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Re: MODX8 to Yamaha HS8s - "Buzz" in Speakers

Unread post by pax-eterna » Tue Jan 22, 2019 8:51 pm

A TRS input will accept a TS - it is just a Yamaha quirk that when you use a TRS on the mono outs of the MODX, it overloads the signal...without seeing the schematic, who knows why this is so. I'd say it's about the only keyboard I have come across that does this. Well, at least, I have not noticed it on other 'boards I have owned!

I have JBL's in my studio and they run fine!
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