Hi, my life is not easy with this amplifier.🙂
Pic-1-2 shows the behavior of MXD alone, all the control signals to the PRE are disabled.
PRE in original condition (see diagram post) has an ultra fast alc that lets VCA (clip) for only 2.5 ms after this time, hook the signal just below clip. (A variation of the signal re-init this action)
this gives the perception of maximum power output without listening thd.
all implementations are in good agreement with the speed of this amplifier. very fast, as you will see the curve of phase soon.
Regards
Last edited:
Hi,
PSU is new DPS-500 (mixed D/A regulated)
this can emulate 2x22000uF without ripple at max power🙂
similary at DPS-600 rips .
I meant what output power from the amplifier.
What are D2 and D3, 1st and 2nd harmonic?
What about THD vs power at 6,67kHz?
What are D2 and D3, 1st and 2nd harmonic?
What about THD vs power at 6,67kHz?
Hi,
thd vs. frequency at 30w 4R
d2-d3 (second and third harmonic)
a short put complete IMD-Test and EMI (irradiation & conduction).
(at 5.5-7,5KHz previous measures are good)
AP2
A 600W amplifier has usually not reached the hard switching area at 30W so THD is usually very good at all frequencies at such power. So far the measurements look good but we need to see THD vs power at 6,67kHz in order to say more or THD vs frequency at higher powers, say 300W.
A 600W amplifier has usually not reached the hard switching area at 30W so THD is usually very good at all frequencies at such power. So far the measurements look good but we need to see THD vs power at 6,67kHz in order to say more or THD vs frequency at higher powers, say 300W.
hi,
Sure I agree ,a short put.
at low power is clare but linearity vs.frequency and power is very good on this amplifier (not all have this), also delay is very low. After you can see phase curve.
DXA-400 is 400W.
AP2
You still have not published the measurement on THD vs power at 6,67kHz. This is what separates the good ones from the bad ones so if you claim that your amplifier is among the best you really should show us this plot.
You still have not published the measurement on THD vs power at 6,67kHz. This is what separates the good ones from the bad ones so if you claim that your amplifier is among the best you really should show us this plot.
hi,
sure...You think a problem instead I not have time (a lot of job have on my table)
tomorrow put,thank.
Probable also put internal diagram of MXD. Then is clare because amplifier is absolute flat.
regards
Hi all,
this is thd vs. frequency at 100w (4-8R). (two measures)
sorry but for now I have little time to put other measures and diagrams.
are available for questions.
Regards
N.B. considered that dxa-400 is measured with SMPS (DPS-500) +/-68V.
this is thd vs. frequency at 100w (4-8R). (two measures)
sorry but for now I have little time to put other measures and diagrams.
are available for questions.
Regards
N.B. considered that dxa-400 is measured with SMPS (DPS-500) +/-68V.
Attachments
Last edited:
AP2
I see that you are not using AES17 filter which makes the measurement quite impressive. When you have time I would like to see the same measurement at even higher powers.
I see that you are not using AES17 filter which makes the measurement quite impressive. When you have time I would like to see the same measurement at even higher powers.
yes,this is direct measuremnts for see also at low frequency 10-100Hz.
as I said before, this amp has no peaks in frequency response,
risonance at particular frequencies. This configuration is obtained Thank MXD.
This works to clean up the signal as model (infinite response filter) without being disturbed by the output current (post classic filter Have).
Normally, this measure is obtained at 1 / 3 of maximum power. Whereas dxa-400 is 400W, this is almost right. (At 250w does not change the profile of the curve) only difference in the value thd as (thd vs. Power).
Regards
AP2
Your technology is quite good but if you want to see the true leader on the market have a look at Alpine Electronics of America, Inc. 🙂
Your technology is quite good but if you want to see the true leader on the market have a look at Alpine Electronics of America, Inc. 🙂
Hi,
I have seen excellent results, certainly everyone develops new methods to improve the class D. But the measures are not very different from our MXD. I saw THD + N (0.05% at 150w) we have the same value but at 400w (4R).🙂
the problem is that not have time to launch in the market MXD, so it is very likely that MXD will be sold to another company. I concentrated on other new developments.
regards
Hello gentlemen, so from what I understood AP2 started a tread to present us with the new product. Inovative or not is for us to decide. the client decides if it inovative or not.
As AP2 says ... the product is great, but ...
Pabo does better products than AP2 but can't start a new thread to present his extraordinaire product.
So my 2 cents are with AP2 who did the effort of starting a thread and did not point the finger, just presented us with his 2 year work.
Sorry Pabo but my first Class D buy will be from AP2.
Best regards,
Savu Silviu
As AP2 says ... the product is great, but ...
Pabo does better products than AP2 but can't start a new thread to present his extraordinaire product.
So my 2 cents are with AP2 who did the effort of starting a thread and did not point the finger, just presented us with his 2 year work.
Sorry Pabo but my first Class D buy will be from AP2.
Best regards,
Savu Silviu
Dear Pabo, I do not know you if you have 40 or 20 years, so I can assess whether you think the sand castles or you did not know the real world.
You say "if you want to see the true leader on the market Have a look at Alpine Electronics of America, Inc."
but I also looked at companies that are desperate because they can not even develop a true protection circuit on the amplifier.😀
reflect the reality and not the "smoke".
Probably many companies that you think leaders on the market, they paid me for some projects.🙂
sorry for this, it is not normal talk about but I think you have to wake up and look at reality not the myth.
Regards
You say "if you want to see the true leader on the market Have a look at Alpine Electronics of America, Inc."
but I also looked at companies that are desperate because they can not even develop a true protection circuit on the amplifier.😀
reflect the reality and not the "smoke".
Probably many companies that you think leaders on the market, they paid me for some projects.🙂
sorry for this, it is not normal talk about but I think you have to wake up and look at reality not the myth.
Regards
savu
As you probably saw I did give AP2 recognition for his amplifier and I am eager to get one in my hands to have a look at. I think that you will be satisfied with his amplifier.
AP2
Your technology is certainly among the best in the world. You are right about the importance of robustness, an amplifier should not break. When one is experienced enough it is quite easy to build robust amplifiers though. Good luck with your company!
As you probably saw I did give AP2 recognition for his amplifier and I am eager to get one in my hands to have a look at. I think that you will be satisfied with his amplifier.
AP2
Your technology is certainly among the best in the world. You are right about the importance of robustness, an amplifier should not break. When one is experienced enough it is quite easy to build robust amplifiers though. Good luck with your company!
- Status
- Not open for further replies.