Apollon 1ET6525SA ST Amplifier Review

[dan_uk]

definitely not universal as I have seen company that takes 10% restock fees, and you pay for shipping back yourself.
With that said, audio components are frequently sold with very high margin. Especially stuffs like cables - which allows dealers to take some hit.

in a way that's the only good contribution of those subjectivists. because they were paying the prices other customers get benefits of test it at home

Just for clarity, I've only really bought from local HiFi shops, where I buy in person/face-to-face, maybe that helps. Could understand a dealer not wanting to pay shipping etc...

 

[Jukka]

Other people already explained this in detail (thanks all), so you probably understood what I was trying to say. But I must comment on this:

But that doesn't make sense, with all due respect. A 10' - 30' speaker cable from an amp to the passive speaker will pick up far more noise and interference (as I can attest) than a short, less than 1-foot cable from the internal amp to the respective driver.

As far as I know, speaker cables pick a lot less interference than what people may think. If not already covered, this could be a subject for @amirm to run a few tests on: how much the length and arrangement (coiled up, big loop, straight, folded, twisted or not) of a normal speaker cable affects the noise pick up in domestic conditions and maybe when cables run past a wifi AP. Speaker cable carries AC power, so optimally you'd want twisted pair as far as possible. That might increase inductance (bad), but I wouldn't know by how much. Also normal homes are usually easy radiological environments, exceptions being if you live right next to a powerful mobile carrier node or live in a big city with a thousand(s) wifi access points and other wireless networked things around.

PS. That's one reason to get mono power amps, you can minimize speaker cable length. XLR is shielded, so it's safer to run in length.

 

[David_M]

Other people already explained this in detail (thanks all), so you probably understood what I was trying to say. But I must comment on this:

As far as I know, speaker cables pick a lot less interference than what people may think. If not already covered, this could be a subject for @amirm to run a few tests on: how much the length and arrangement (coiled up, big loop, straight, folded, twisted or not) of a normal speaker cable affects the noise pick up in domestic conditions and maybe when cables run past a wifi AP. Speaker cable carries AC power, so optimally you'd want twisted pair as far as possible. That might increase inductance (bad), but I wouldn't know by how much. Also normal homes are usually easy radiological environments, exceptions being if you live right next to a powerful mobile carrier node or live in a big city with a thousand(s) wifi access points and other wireless networked things around.

PS. That's one reason to get mono power amps, you can minimize speaker cable length. XLR is shielded, so it's safer to run in length.

With my speaker cable, I could easily decode AM radio stations in the Connecticut area, typically around 530kHz to 550kHz.

And the solution was ... lift the cable a bit and place it back on the floor, but in a slightly different arrangement than before. This worked for quite a bit (weeks to a month), until another AM radio station came through again. Rinse, repeat ad nauseam.

 

[daniboun]

As far as I know, speaker cables pick a lot less interference than what people may think. If not already covered, this could be a subject for @amirm to run a few tests on:

Amir debunked the myth of the expensive cable....

 

[Jukka]

Amir debunked the myth of the expensive cable....

I remember that, but what I asked would be different. I would hope for tests about cable length, how it picks up radio interference (or noise) and does arranging it differently on the floor make a difference (spoiler: should make). The test could be made with just one cable or two where the only difference is length.

 

[amirm]

I remember that, but what I asked would be different. I would hope for tests about cable length, how it picks up radio interference (or noise) and does arranging it differently on the floor make a difference (spoiler: should make). The test could be made with just one cable or two where the only difference is length.

Due to the low impedance of the speaker, and high levels of the signals, inducing noise into the speaker wire is very hard (hence the reason it is not shielded).

It can be done though by putting a transformer right at the cable. See: https://www.audiosciencereview.com/...ost-superflatline-speaker-cable-review.45615/

 

[harkpabst]

View attachment 503654
one click away. I don't need a new amp. I don't need a new amp

Neither did I.

It's all your fault, pointing me to the coupon code ...

 

[Fletcher Munson]

Neither did I.

It's all your fault, pointing me to the coupon code ...

me too lol

 

[David_M]

Due to the low impedance of the speaker, and high levels of the signals, inducing noise into the speaker wire is very hard (hence the reason it is not shielded).

It can be done though by putting a transformer right at the cable. See: https://www.audiosciencereview.com/...ost-superflatline-speaker-cable-review.45615/

Inducing noise into a speaker wire is not hard in my experience. My 10-gauge 20+ ft wire easily picked up nearby AM radio stations as I indicated above. Speaker wire length creates a perfect antenna for low wavelength AM radio signals to propagate on ... and the AM signal is decoded in the speakers.

 

[Fletcher Munson]

Inducing noise into a speaker wire is not hard in my experience. My 10-gauge 20+ ft wire easily picked up nearby AM radio stations as I indicated above. Speaker wire length creates a perfect antenna for low wavelength AM radio signals to propagate on ... and the AM signal is decoded in the speakers.

Unlikely for many reasons

 

[Mnyb]

Some power amps can decode AM , I had a rotel amp doing that . Not particularly dependent on the speaker cable .

Design problems in the amp I suspect.

 

[pma]

Due to the low impedance of the speaker, and high levels of the signals, inducing noise into the speaker wire is very hard (hence the reason it is not shielded).

Speaker has high impedance at AM radio frequencies, not low (driver and crossover inductances). It is about coupling impedance, we do not speak about 20kHz here.

Below the AM radio transmitters I measured (in 2020. They have been switched off recently) on speaker cables:

But yes, it is a non-issue. If the amp is prone to AM rectification, the reasons are:

- poor input stage design
- poorly shielded input signal cable
- the system loops
- amplifier inside the box wiring and shielding

 

[delta76]

Neither did I.

It's all your fault, pointing me to the coupon code ...

me too lol

you're both welcome!

 

[ianjams21]

you're both welcome!

Also ordered after seeing that theres a coupon code... damn it probably won't even hear a difference with my NAD C399

 

[MarTec]

I´m curious about the power consumption of the amp.
From the Purify specs shown in post #48 it says 1.6W in idle mode.

But does anyone know what the power consumption is in standby mode and under load?

 

[Sokel]

I´m curious about the power consumption of the amp.
From the Purify specs shown in post #48 it says 1.6W in idle mode.

But does anyone know what the power consumption is in standby mode and under load?

You have to add PSU's losses as well and any potential others, like buffers, etc.

(idle is not the same as stand-by though, standby is inder 0.3W if I remember well (if any), so adding PSU standby looses do not exceed EU's 0.5W rule)

 

[MarTec]

It seems that my understanding is not correct

I thought 1.6.W is the value shown on a power meter if the amp is in idle mode.
Hence my question about the standby and under load values.

 

[delta76]

Also ordered after seeing that theres a coupon code... damn it probably won't even hear a difference with my NAD C399

first of all, you're welcome
second of all, not probably, it's absolutely. But now you have an end game for less money

 

[MarTec]

You have to add PSU's losses as well and any potential others, like buffers, etc.

(idle is not the same as stand-by though, standby is inder 0.3W if I remember well (if any), so adding PSU standby looses do not exceed EU's 0.5W rule)

Yes..that´s exactly what I mean.
Idle mode = amp reveiced a signal from the source but no music is playing
under load = music is playing
standby = sleep modus (should be around 0.5W if the manufacturer follows EU rule).

 

[Sokel]

Yes..that´s exactly what I mean.
Idle mode = amp reveiced a signal from the source but no music is playing
under load = music is playing
standby = sleep modus (should be around 0.5W if the manufacturer follows EU rule).

So, yes, for idle is as described above.
Under load though, you have to look at the datasheet for efficiency and power losses charts (they also show different loads there) and combine them where they are not.
Both Purifi and Hypex (PSU) datasheets have those charts.