is that a NO...NO....
if so sorry, will not happend again...
Hey you live in my area...
have you built anything, that you care to show-share...
chris
if so sorry, will not happend again...
Hey you live in my area...
have you built anything, that you care to show-share...
chris
I'm pretty sure I've read this whole thread twice and I don't think I've seen anyone mention this issue so I need to here in case anyone runs into the problem I did with these amps.
I bought four of these amps to have watts to play with. I also purchased a pair of the PartsExpress DVC 8" subwoofers (295-480) and built small sealed enclosures because I've always been curious what stereo bass would be like. I'll comment on that in a bit, but the point I need to make is that these plate amps do not seal.
I built the first box and as a final test before firing it up, I pushed on the cone (old car audio habit to check for leaks). Not only was there some major play in the cone, the back of the box where the amp was actually whistled.
I finally tracked down the source of the air leak, and the whistling sound, and it was in the switch that you use to change the voltage on the back. My fix was to slather some elmers wood glue over the whole assembly on the inside as well as over the foam that holds the green circuit board on the upper part of the inside of the amp.
That did the trick.
If, as I have read earlier in this thread, your amp "lacks slam", you may simply have a major leak in your box.
This was not simply a faulty unit as both that I designated for this project had the same problem.
I hope that helps some of you. It gave me fits for a while.
Now as I promised, some comments on stereo bass and the Dayton DVC 8" subwoofer. First, I like stereo bass a lot and it's got me thinking about a bigger project to go with my reference MTMs. The 8s go with the Zaph designed Hi-Vi B3N mini-monitors. Second, as noted above, these amps fail to turn on when there is a low signal being passed to them. Oh well... However, and finally, these amps at $50 are a steal and are fun to design with. If you love bass like I do you should have a pile of them around to build with when you get the urge.
I bought four of these amps to have watts to play with. I also purchased a pair of the PartsExpress DVC 8" subwoofers (295-480) and built small sealed enclosures because I've always been curious what stereo bass would be like. I'll comment on that in a bit, but the point I need to make is that these plate amps do not seal.
I built the first box and as a final test before firing it up, I pushed on the cone (old car audio habit to check for leaks). Not only was there some major play in the cone, the back of the box where the amp was actually whistled.
I finally tracked down the source of the air leak, and the whistling sound, and it was in the switch that you use to change the voltage on the back. My fix was to slather some elmers wood glue over the whole assembly on the inside as well as over the foam that holds the green circuit board on the upper part of the inside of the amp.
That did the trick.
If, as I have read earlier in this thread, your amp "lacks slam", you may simply have a major leak in your box.
This was not simply a faulty unit as both that I designated for this project had the same problem.
I hope that helps some of you. It gave me fits for a while.
Now as I promised, some comments on stereo bass and the Dayton DVC 8" subwoofer. First, I like stereo bass a lot and it's got me thinking about a bigger project to go with my reference MTMs. The 8s go with the Zaph designed Hi-Vi B3N mini-monitors. Second, as noted above, these amps fail to turn on when there is a low signal being passed to them. Oh well... However, and finally, these amps at $50 are a steal and are fun to design with. If you love bass like I do you should have a pile of them around to build with when you get the urge.
This is a great example of why I just don't believe in the plate amp thing.
I just don't like putting an amp in a speaker enclosure. I don't think it's good for the amp or the enclosure. No big deal (to me) to just build a small enclosure for the amp.
Yousuredo,
Let me know how your project goes. Am in prosses of building MTM speakers now. Have seriuos thoughts of latter adding two subs and kind of making them the base for a pair of floor standers with the MTMs.
Would be interested in why you would preffer side fireing.
I just don't like putting an amp in a speaker enclosure. I don't think it's good for the amp or the enclosure. No big deal (to me) to just build a small enclosure for the amp.
Yousuredo,
Let me know how your project goes. Am in prosses of building MTM speakers now. Have seriuos thoughts of latter adding two subs and kind of making them the base for a pair of floor standers with the MTMs.
Would be interested in why you would preffer side fireing.
Only reason for side firing...
wanting to keep a slim front profile of the towers...
where else is there to mount a 10"/12"...?
thanx for the heads up on the leak...
If I do put it in the box, I will be sure to close it off from the rest...
wanting to keep a slim front profile of the towers...
where else is there to mount a 10"/12"...?
thanx for the heads up on the leak...
If I do put it in the box, I will be sure to close it off from the rest...
You're welcome. It may just be that I got two made by the same person on the same day and that they were not as careful as they should have been. Others may not have this problem, but I suspect they will.
Sealing the plate amp off from the rest of the box just adds a bit of work and makes the box a bit bigger. It's a real pain if you've already finished the boxes though as I had.
Since you bring up the side-firing concept, I am seriously considering taking the Shivas out of my car and replacing them with something less ferocious (I don't need that much artillery in the car and they take up most of the back), and using said Shivas for stereo subs, side-firing.
Does having them fire to the side affect anything? If you have dual side-firing subs in stereo do you want them facing in the same direction or can they face each other? Intuitively I'm guessing that if they face each other you'll have cancellation issues but maybe not...
Sealing the plate amp off from the rest of the box just adds a bit of work and makes the box a bit bigger. It's a real pain if you've already finished the boxes though as I had.
Since you bring up the side-firing concept, I am seriously considering taking the Shivas out of my car and replacing them with something less ferocious (I don't need that much artillery in the car and they take up most of the back), and using said Shivas for stereo subs, side-firing.
Does having them fire to the side affect anything? If you have dual side-firing subs in stereo do you want them facing in the same direction or can they face each other? Intuitively I'm guessing that if they face each other you'll have cancellation issues but maybe not...
Mine doesn't leak (I don't think) but it does have an audible hum in the mains when using the low-level in/out. Also some distortion that almost sounds like RF noise in the drivers. Anyone else?
Any updates on Modding the amp...
Mine came in yesterday, and I would love to here what you all think can be done to improve them...
chris
ground loop isolaters or ???
~~~~~~~~edit~~~~~~~~~
what Sub would work well with Amp ?
I have two Amps, so either two subs, or a DVC sub with one amp on each vc...
Mine came in yesterday, and I would love to here what you all think can be done to improve them...
chris
ground loop isolaters or ???
~~~~~~~~edit~~~~~~~~~
what Sub would work well with Amp ?
I have two Amps, so either two subs, or a DVC sub with one amp on each vc...
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