Amplifier Help

[West164]

Hi, new here. Let me begin by saying I have very little knowledge when it comes to amps and speakers and looking for some help. I'm making a Bluetooth speaker with this amplifier board:

https://www.amazon.com/gp/aw/d/B01I9KV7F4/ref=oh_aui_i_d_old_o1_img?ie=UTF8&psc=1
(TDA7492P 2x50W)

I know it's not anything amazing, but I want to try getting the best possible sound quality/volume I can out of it. It has 50W per channel, but I'm using 8 ohm speakers so I assume it is 25W (correct me if I'm wrong). I'm putting 12v into it, which is on the lower end of what it is allowed to take. I bought some sets of bookshelf speakers from goodwill and have been switching trying to find which give the better results. I don't know the proper speakers for it, which is why I'm probably having some issues. One set is the Sanyo st-95 (8 ohms, can't find specs) , another is JVC SP-D402 (3-way, 6 ohms, capacity 80W, 87dB/W), and finally soundesign 0657blk (2-way, nominal 3W, 8 ohm, 90dB/W). I probably left out some info so please ask if I forgot anything.

No matter which speakers I use, I can't get above about half volume without distortion, or possibly clipping. I tried putting them into my lepai-2020A+ and all speakers sound good at high volume.

My question is what causes clipping (or distortion)? Not sure if those 2 terms are similar. I've read it can be from a lack of power, but both have the same input voltage but the TDA7492P has 50W and the lepai has 25W, so I have no idea why the sound quality goes with the higher volume. As you can see I really have no idea what I'm doing, but I love tinkering with this stuff and want to learn. Any help is greatly appreciated.

 

[TechHDS]

Sanyo? don't they make microwave ovens?
I can truly say don't believe I have ever seen, the manufacturer of, other reputable speaker company's name on a microwave oven or rice cooker pot.

 

[Bucknekked]

Hi, new here. Let me begin by saying I have very little knowledge when it comes to amps and speakers and looking for some help. I'm making a Bluetooth speaker with this amplifier board:

https://www.amazon.com/gp/aw/d/B01I9KV7F4/ref=oh_aui_i_d_old_o1_img?ie=UTF8&psc=1
(TDA7492P 2x50W)

I know it's not anything amazing, but I want to try getting the best possible sound quality/volume I can out of it. It has 50W per channel, but I'm using 8 ohm speakers so I assume it is 25W (correct me if I'm wrong). I'm putting 12v into it, which is on the lower end of what it is allowed to take. I bought some sets of bookshelf speakers from goodwill and have been switching trying to find which give the better results. I don't know the proper speakers for it, which is why I'm probably having some issues. One set is the Sanyo st-95 (8 ohms, can't find specs) , another is JVC SP-D402 (3-way, 6 ohms, capacity 80W, 87dB/W), and finally soundesign 0657blk (2-way, nominal 3W, 8 ohm, 90dB/W). I probably left out some info so please ask if I forgot anything.

No matter which speakers I use, I can't get above about half volume without distortion, or possibly clipping. I tried putting them into my lepai-2020A+ and all speakers sound good at high volume.

My question is what causes clipping (or distortion)? Not sure if those 2 terms are similar. I've read it can be from a lack of power, but both have the same input voltage but the TDA7492P has 50W and the lepai has 25W, so I have no idea why the sound quality goes with the higher volume. As you can see I really have no idea what I'm doing, but I love tinkering with this stuff and want to learn. Any help is greatly appreciated.

West164
Welcome to the AH. hope you find lots of help here.

For your specific request, one of the DIY threads would probably be a better place to get more traffic and hits. There are a number of DIYers on the AH and they can be pretty helpful.

What your stuff sounds like is a science experiment. I know there are several folks who have done blue tooth speakers using kits and such. None will be stellar audio but that doesn't seem to be the point with BT speakers. I have one and its great for what I use it for.

Good luck.

 

[West164]

West164
Welcome to the AH. hope you find lots of help here.

For your specific request, one of the DIY threads would probably be a better place to get more traffic and hits. There are a number of DIYers on the AH and they can be pretty helpful.

What your stuff sounds like is a science experiment. I know there are several folks who have done blue tooth speakers using kits and such. None will be stellar audio but that doesn't seem to be the point with BT speakers. I have one and its great for what I use it for.

Good luck.

Thank you, I will repost there!

 

[slipperybidness]

Hi, new here. Let me begin by saying I have very little knowledge when it comes to amps and speakers and looking for some help. I'm making a Bluetooth speaker with this amplifier board:

https://www.amazon.com/gp/aw/d/B01I9KV7F4/ref=oh_aui_i_d_old_o1_img?ie=UTF8&psc=1
(TDA7492P 2x50W)

I know it's not anything amazing, but I want to try getting the best possible sound quality/volume I can out of it. It has 50W per channel, but I'm using 8 ohm speakers so I assume it is 25W (correct me if I'm wrong). I'm putting 12v into it, which is on the lower end of what it is allowed to take. I bought some sets of bookshelf speakers from goodwill and have been switching trying to find which give the better results. I don't know the proper speakers for it, which is why I'm probably having some issues. One set is the Sanyo st-95 (8 ohms, can't find specs) , another is JVC SP-D402 (3-way, 6 ohms, capacity 80W, 87dB/W), and finally soundesign 0657blk (2-way, nominal 3W, 8 ohm, 90dB/W). I probably left out some info so please ask if I forgot anything.

No matter which speakers I use, I can't get above about half volume without distortion, or possibly clipping. I tried putting them into my lepai-2020A+ and all speakers sound good at high volume.

My question is what causes clipping (or distortion)? Not sure if those 2 terms are similar. I've read it can be from a lack of power, but both have the same input voltage but the TDA7492P has 50W and the lepai has 25W, so I have no idea why the sound quality goes with the higher volume. As you can see I really have no idea what I'm doing, but I love tinkering with this stuff and want to learn. Any help is greatly appreciated.

Are you using the same 12V supply on each amp?

My first thought is that you may want a higher voltage on the P/S, and whether or not the P/S is robust enough for your application.

 

[TechHDS]

Yep, much better spot for help with experiments. DIY Thread would be the appropriate place to post. Reminds me of the Heath kits I used to build back in the 70s. Word of caution with 12 volt supplys although it won't kill you unless your standing in water or in a bathtub, it will grab you hold you and it won't let go and burns like hell. I know been hit by 120V, many times. I even survived a 480V flash in a MC room in the Gulf of Mexico. What saved my life was the 2" rubber mat and all the protective gear I had on. Kits, projects, DIY things are great lots of fun and can be a great way into expanding knowledge with this or any gear for use. Safety First!.

 

[Bucknekked]

Yep, much better spot for help with experiments. DIY Thread would be the appropriate place to post. Reminds me of the Heath kits I used to build back in the 70s. Word of caution with 12 volt supplys although it won't kill you unless your standing in water or in a bathtub,

wow. I haven't thought about Heath Kits in years and years. When I got out of the Air Force my G.I bill paid for some education from Devry Technical Instittute. Putting together an oscilloscope, a DVM, and eventually a 25" color TV was part of the curriculum. All were Heath Kits. All were a decent challenge that produced some pretty cool tools and experience. I ran that 25" TV for nearly a decade before it bit the dust. I wished I had kept the o'Scope but as the speeds of electronics picked up, it was always too slow to really be effective. I havn't thought of those things for years . What a trip down memory lane

 

[Verdinut]

That reminds me that in the 1960's, I had built an EICO AM/FM tuner kit and a couple of years later, I built the proper EICO Multiplex adapter for receiving stereo broadcasts. That was a good experience then.

 

[Bucknekked]

25 years on a Tube? is that without any service? I still have "Flash" backs to the days of servicing tube TV's. O, scopes that I used where about the late 70's to late 80's slow and sometimes painful..lol Very helpful tool with engine diagnostics for performance and drivability issues. Back in them days Tech didn't have the snap-on scanners, diagnosing tools they have today in the dealerships. You better have had a good volt ohm meter and a very good working knowledge of your systems that where utilize with fuel management and air management. The old days of pulling off the top of a 4 barrel carburetor to tweet the float level or change out the meteing jets left the old school part changer mechanic in the dust. Most of them poor guys had to find other line of work. The "Shop" mechanic today isn't what your father's Master Certified Tech is today.

I probably wasn't clear: it was a 25" Color TV, but, what made it attractive was it was all solid state. They designed each type of circuit (audio, video etc) on separate solid state boards. you fastened them all to the metal chassis and if you didn't electrocute yourself, it worked out great. No tubes in this TV except the picture tube of course. It lasted a decade or somewhere thereabouts. This would have been 1977-1978 ish for the build. Transistors as discrete, solderable devices were big. IC's had begun, but hadn't hit their stride yet. I soldered a lot of transistors.........It was actually a pretty rewarding experience.

When my wife tells people I built a 25" color TV from scratch, they are usually amazed. That's not exactly the truth, but the details are just details to most folks.