Can anyone help? What is the power supply value at the points indicated in the image? it is a presonus eris 3.5 speakers board.

https://preview.redd.it/sz9wbxfsfdge1.jpg?width=1200&format=pjpg&auto=webp&s=bf925abd4b3d12e5da3bcecc97b0e06be8374fb7

Could some of you please post pics of how your work space is set up? Especially if your space is limited. I'm going to have a corner space that may be six feet on either side, max. Thanks

Hello,

I have some old speakers where the outside seal around the cone has broken down.

It now makes a fuzzy rattle noise when playing audio, how can i repair this, preferably as cheap as possible.

https://preview.redd.it/zs8ahlor38ge1.jpg?width=2448&format=pjpg&auto=webp&s=b4c8f80398828603f56590cada1687fb09d5dd76

denon usc110, 70w 8ohm if that matters.
btw, how much would a pair of brand new similar speakers cost me?

I plugged a cord into the amp and then had the other side that would go into the guitar open. I had the announcer my desk and it accidentally touched some metal and I think short circuited cause it just shut off. do you know how I may be able to fix it?

The lower fan on my Yamaha Stagepas300 mixer is quite loud. I doused it in CRC electronics cleaner when I had it open last month, and it was extra fantastically quiet. But now it's come back with a vengeance. I'm assuming I cleaned off both the dirt and the grease and now need to add more grease (or lube?)

Wondering if there's any basic hardware grease I might already own I can use, or even mineral oil etc or if it needs to be special electronics grease?

Unsure what the issue is but my Yamaha RX-750 is producing way too high a volume. Initially I was having an issue where the volume was normal levels but coming through crackly and I thought my speakers were blown, but I cleaned all the connections and now it sounds clean but it’s way too loud. I have the volume knob turned all the way down but when I enable the speakers on channel A it just sounds like it’s at maximum. Any advice? Could it be a problem with the receiver or the way I wired the speakers?

Hello!

I’m fairly good at troubleshooting electronics. I work on a lot of CRT monitors/arcades so I know what not to do at least.

Although, I haven’t worked on a lot of hifi equipment, so right now I have 6-7 power amplifiers that need service and so far a have:

• DIY signal generator (iPhone with an signal app going to a pre-amp/mixer)
• Dummy Load - Bought 8 pcs 8ohm 100W resistors.
• Cables to connect everything.
• Oscilloscope

Today I tried the setup and I can see on the sinus waveform on the oscilloscope that some channels on these 4-channels amps doesn’t look good. But I wanted to check with the experts here with the details I’m not sure about since this is new to me.

So, here’s my questions:

• For stereo amps at home and these power amps for gigs and such, what Vpp level should I set when feeding the inputs of an amp? I think I had it set too low so I saw two fuzzy sinuswaves on the o-scope. When I turned it up I got one and it looked as it should.

• When you have to low of an input, does that mean the amp isn’t driving to full effect?

• About the dummy load. These amps can deliver 400W+. I have two 8ohms 100W resistors in series x2 then connected in parallell givning me 8ohm 400W , right? I have these for two outputs of course.

• Does these get hot quick? I tried today and I don’t know if the volume was to low so amp didn’t work as hard?

Thanks in advance!

My fisher rs-90 has a blown fuse that is 250v 2a and the fuse doesn't say if it's slow or fast blow and I have no access to the manual. What do I do?😭

Help!

A few years ago I bought a lovely Toshiba SB-300 second hand.

I love this amp! It sounds beautiful and I have it hooked up to two sets of speakers in my flat. We use it every day in our flat.

It's never been without its issues. The pots are very crackly and sometimes the sound would go a little muffled in one of speakers. I usually fixed this by turning the amp off and then immediately on again, or by replacing the speaker wire.

Tonight I was watching the film Anora on my TV with an aux cable plugged into the "Video" channel on my amp. This is how I primarily use it, with an aux cable. I also listen to my vinyl on "Phono 1".

All of a sudden the left channel died. I'm used to this so I went to make sure that the left speaker was properly connected. It was fine. I then checked the aux cable was working and it was.

I played a record through both speaker systems A and B and also plugged my headphones into the amp.

With all of these tests I've only got sound from the right channel. Nothing comes through the left channel at all. No muffled low noise or speaker hum. It's completely quiet.

I had a look inside and it looks pretty dusty but no loose cables or obvious damage to my knowledge.

Any suggestions?

https://preview.redd.it/h4lfz7zz5tfe1.jpg?width=4032&format=pjpg&auto=webp&s=c683f393b08e1909dd0e6c7be74ba12d5474467e

https://preview.redd.it/db4xx5yz5tfe1.jpg?width=4032&format=pjpg&auto=webp&s=b4cc4da3f76b38613a38c67eb15a0448a58891fb

I have noticed recently that my right speaker will randomly drop about 6db in volume. I don’t ever change the volume on the speakers themselves, nor do I mess with the cords. I turn them on and usually have them on while working all day (8 hours).

If I turn that speaker off for a bit and turn it back on (say 30 minutes to an hour) it will be fine again. Feels like a component is heating up and failing, but I have no idea where to start with it.

I bought a pair of acoustic research 2ax speakers about a year ago with the intent of rebuilding the guts. The pots seem to spin freely almost making 0 connection. I’ve never felt another set but they felt loose. I took both pots out of the one speaker and it looks Like someone else already tried cleaning them. They were put in with ….wire nuts…. From what I can see I have 3 options. I don’t think they are salvageable.

• buy new rheostats (expensive)
• replace with potentiometers
• replace with L pads and a resistor

I think I’m leaning towards the potentiometer but I’m not sure what difference it would make. Does anyone have experience with swapping the two?

Edit:formatting

Behringer NX6000 issues

I have had two behringer NX6000s stop working. They were powering my home theater subwoofers. The first one was in the repair shop for three years and they could not get a replacement power supply unit from Music tribe. So I got the unit shipped back to me. While this was in the repair shop the second unit stopped working. I purchased a replacement power supply unit from eBay and replaced the one in the amp and now it works. However before I could order a second power supply unit to replace the amp that was shipped back to me, the parts ran out. Is there a way to find out what specific part of the power supply unit in this unit is not working and perhaps get the component alone rather than replace the board which is not in stock on eBay and I can't find any other source? Even if I did manage to buy one elsewhere I want to fully evaluate that that is what needs to change. Or alternatively where can I find a new power supply unit?

headset cord

idk how this happened. if someone could tell me how to fix it and/or prevent it from happening it would be much appreciated. my mic has been static-y because of this

Hello. I posted last week about a new-to-me not working Sony PS-X800 linear tracking turntable that isn't working. I have a video here showing its behavior. Basically, here's what happens:

When powered on, the LED next to the start/stop button flashes quickly, then the tonearm appears to balance itself properly (the red light goes off) and, if it's not already there, it returns to home. The tonearm move buttons operate correctly - left and right, regular and fast.

However, none of the other controls do anything. Start/stop button, speed selector button, repeat button and tonearm raise/lower button (I think the tonearm raise/lower button doesn't respond simply because the platter isn't spinning). I thought the issue was the actual tactile switches behind the first 3 buttons, so I desoldered them, cleaned them up, tested with a multimeter and reinstalled them. They all operate as expected on the multimeter, so that's not the issue - I also put in a couple of new tactile switches just to see if they made it respond, and they don't.

I have the service manual. I want to trace a signal from the buttons through to the main motor servo and speed select. I don't think the issue is with the IC111 CPU, since it processes the tonearm movement commands as well as the other commands, but I really could use some advice.

Thank you!

Hi all, my Vestax PMC-06 Pro A has intermittent sound caused by (I’m 95% sure) the inputs on both channels. Grateful for any advice on:
a) What else it could be
b) Fixing this issue
Thanks

https://preview.redd.it/cgvfgqqpnife1.jpg?width=1536&format=pjpg&auto=webp&s=1befe7b769fd7e04f5f7a679655972d12f1637c4