Class D amplifiers generally have restricted HF performance, particularly wrt damping factor, and to a lesser extent, with distortion and frequency extension. After all, the rail to rail switching noise of the output stage must be massively filtered against with ****guh...guh...guh...gasp!?!**** passive "audio friendly composition core" inductors and capacitors, and they most always switch at a rate below 1Mhz, anyway. Also, hopefully the rest of the audio system is RFI 'friendly'.
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I have a bunch of old stranded wire that I'll bet would change Gedlee's mind about "all wires tasting like water".
A lot of the strands are kinda funny colors because of the exposure to the atmosphere that affects almost all speaker wires. Might have to throw on some duct tape for a few sections where the rubber and plastic insulation flaked off, too.
A lot of the strands are kinda funny colors because of the exposure to the atmosphere that affects almost all speaker wires. Might have to throw on some duct tape for a few sections where the rubber and plastic insulation flaked off, too.
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If coat hangers can't be A/B tested to sound different, I doubt oxidized copper would either.
Wow. Never seen this before. Coaxial with horn.
PreSonus | Sceptre
https://www.youtube.com/watch?v=nzE9NIm7zbE
Should give a nice Xover but what about diffraction? That looks like an issue to me. Of course; not much CD either with that small horn.
An externally hosted image should be here but it was not working when we last tested it.
PreSonus | Sceptre
https://www.youtube.com/watch?v=nzE9NIm7zbE
Should give a nice Xover but what about diffraction? That looks like an issue to me. Of course; not much CD either with that small horn.
Cool. Hadn't seen those before. JBL it is.
An externally hosted image should be here but it was not working when we last tested it.
From a review of the Presonus Sceptre:
We would need to see an impulse response if there's diffraction issues or not.
Those are pretty classic speakers. Hugely popular decades ago. They were not originally JBL, they were UREI. They were referenced in my foam patent as prior art.
But they neglect to point out that this cannot be a global correction as it will only work correctly at a single point in space. All other points get worse.
At more than one point in space.
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Those look like a newer version of some Altec 605s I once had a chance to compare to my Tannoy System 12 DMT IIs. Suffice it to say that the Altecs didn't wow me on their own, and suffered greatly from direct comparison.
Remember that cheap class D amp that was recommended and I bought for $50 from China?
Well, I got it several days ago. When I tried to unscrew the speaker terminals, one was stuck. I used a little force on it and the terminal loosened! And there are loose parts inside the amp now. Great quality!
And do you think Shenzhenaudio has answered my e-mail? Nope, of course not. Looks I've bought myself a DIY amp.
Well, I got it several days ago. When I tried to unscrew the speaker terminals, one was stuck. I used a little force on it and the terminal loosened! And there are loose parts inside the amp now. Great quality!
And do you think Shenzhenaudio has answered my e-mail? Nope, of course not. Looks I've bought myself a DIY amp.
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Of course. How stupid of me.
Chinese quality and service!
So, let's summarize what you were given for 50$.
- fully assembled TPA3118D2 digital amp
- power supply
- free shipping
The nut is airborne. Tricky issue to deal with.
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For 50 bucks there is not much to complain, I believe. So I've ordered one myself. If it is good, it will replace the AB amp driving my mid-highs panels. Load invariance would not be such a big issue as a dedicated amp.
Heck it might even be small enough to integrate it in the same enclosure with my DAC/DSP/ASP unit, I kind of grew tired of big components lying in a rack.
Heck it might even be small enough to integrate it in the same enclosure with my DAC/DSP/ASP unit, I kind of grew tired of big components lying in a rack.
Something like this: http://www.diyaudio.com/forums/minidsp/194010-minidsp-based-system-gallery.html
I am trying to make something similar too.
I am trying to make something similar too.
Amp has arrived and had EXACTLY the same issue as in the picture above. I've opened it (yes, guarantee is void, but who cares..) and screwed the nut properly. What bothered me even more is the obvious bad soldering (the speaker output wire unsoldered !). Other than that, the board itself looks very good.
The sound is really good, did not notice any anomaly and it rendered the sound I am used to from my speakers, with a rich soundstage on proper recordings. Voices are very clean and cymbals "ethereal" The thingie is REALLY small, smaller than it looks in the pictures. Integrating in the main case of the DSP/ASP is possible.
The sound is really good, did not notice any anomaly and it rendered the sound I am used to from my speakers, with a rich soundstage on proper recordings. Voices are very clean and cymbals "ethereal"
The thingie is REALLY small, smaller than it looks in the pictures. Integrating in the main case of the DSP/ASP is possible.Wrt speakers with xovers between 1&4 khz, how about the JBL 515 265F-1 15" woofer which crosses over to the 2414H tweeter at 2.2Khz?
The 265F-1 cone profile appears to be curvilinear, like that of the 2220 series, so that may be how JBL has kept away from major dispersion issues above 700 hz with this design. IAC, I haven't read anything where anything bad was written about the mids in this design.
I wonder if anybody has gotten a good listening impression of JBL's Differential Drive approach in general, also?
The 2414H tweeter appears quite small (2 3/8 " diameter & about 3/4" thick) to be rated at 100Wrms, btw. If anybody has a tech spec sheet for the tweeter, I'd like to see it since I am considering it for a smaller speaker project.
The 265F-1 cone profile appears to be curvilinear, like that of the 2220 series, so that may be how JBL has kept away from major dispersion issues above 700 hz with this design. IAC, I haven't read anything where anything bad was written about the mids in this design.
I wonder if anybody has gotten a good listening impression of JBL's Differential Drive approach in general, also?
The 2414H tweeter appears quite small (2 3/8 " diameter & about 3/4" thick) to be rated at 100Wrms, btw. If anybody has a tech spec sheet for the tweeter, I'd like to see it since I am considering it for a smaller speaker project.
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