Dac low coast, low consumption for mobile phone ... I go my way!
Too bad these chips deserve more...
Have recently acquired a new pair of all-weather speakers. apart mask 4 to be exact and seems that my previous board is just not fit for them (attached the one i have). Looking forward on your advice for an amp which has an aux and a Bluetooth connection (hard time deciding on the source of audio) which can pump the speakers up, The amplifier will be set in a hard to reach place with the only option to reset the power if smthing goes wrong
The specs are like impendence of either 8 or 16 (different sources) at 60w
The specs are like impendence of either 8 or 16 (different sources) at 60w
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Some pics of the O-Noorus PA-70 (1 x MA12070) details.
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I'm wondering about the performance of the dual chip design vs single.
Do you think they will sound much different or just a little more power?
I have 96db efficient speakers so the max power isn't so important, but should there be much difference in bass response/impact, imaging etc., due to the dual chip design?
Power spec's of O-Noorus MA12070 amps on Audiophonics:
PA-70 2x55W @ 4Ω, 1% THD (single chip)
OA36S 2x65W @ 4Ω, 1% THD (dual chip)
PA80 2x80W @ 4Ω, 2x45W @ 8Ω (dual chip)
Sadly they don't have any pics of the PA80 internals. Below is the OA36S.
One obvious difference I see is the WiFi chips used in the PA-70 vs the OA36S
Do you think they will sound much different or just a little more power?
I have 96db efficient speakers so the max power isn't so important, but should there be much difference in bass response/impact, imaging etc., due to the dual chip design?
Power spec's of O-Noorus MA12070 amps on Audiophonics:
PA-70 2x55W @ 4Ω, 1% THD (single chip)
OA36S 2x65W @ 4Ω, 1% THD (dual chip)
PA80 2x80W @ 4Ω, 2x45W @ 8Ω (dual chip)
Sadly they don't have any pics of the PA80 internals. Below is the OA36S.
One obvious difference I see is the WiFi chips used in the PA-70 vs the OA36S
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The PA80 uses this NJW1194 chip for tone and volume control.
You DIY guys have an opinion on this versus the PA-70 manual/physical tone controls?
which amp looks like it has better 1) likely better sound and value, 2) mod potential?
I'm guessing the tone controls could be bypassed in the PA-70 if desired and not in the PA80?
You DIY guys have an opinion on this versus the PA-70 manual/physical tone controls?
which amp looks like it has better 1) likely better sound and value, 2) mod potential?
I'm guessing the tone controls could be bypassed in the PA-70 if desired and not in the PA80?
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Good question. I vaguely remember someone mentioning that the speakers' voice-coils can act as this (part of the circuit) but I'm note sure.
Btw, @jean-paul commented on filtering here: https://www.diyaudio.com/community/threads/infineon-ma12070-class-d.347422/post-7164883
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The absence of filtering is tolerated on short HP cable links, beyond that the HP cables behave like an RF antenna...
I would also be afraid of burning out the tweeters because of the high PWM frequencies that they could absorb if the crossover doesn't do its job.
This is why the output filters heat up on class D amps, they absorb unwanted high frequencies, so imagine the poor tweeter coil... 🧐 🧐 🧐
I would also be afraid of burning out the tweeters because of the high PWM frequencies that they could absorb if the crossover doesn't do its job.
This is why the output filters heat up on class D amps, they absorb unwanted high frequencies, so imagine the poor tweeter coil... 🧐 🧐 🧐
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I just ordered a very inexpensive BRU5 TPA3244 based amp with BT and USB on aliexpress, worth a try for only $27
might try one of the MA12070 o-noorus later.
might try one of the MA12070 o-noorus later.