CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

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Author Topic: Bakoon HPA-01  (Read 8932 times)

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ultrabike

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Re: Bakoon HPA-01
« Reply #30 on: October 13, 2014, 10:33:47 PM »
ye... HD558s might be no go...

HD558 impedance plot:


HD600 impedance plot:
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Tor4

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Re: Bakoon HPA-01
« Reply #31 on: October 13, 2014, 10:55:18 PM »
Could the HD558 be even destroyed by an extremely inappropriate amp pairing? Like too extreme midbass for the drivers to take with some serious impedance mismatch...
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Armaegis

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Re: Bakoon HPA-01
« Reply #32 on: October 13, 2014, 11:12:01 PM »
Quote from: Solderdude on October 13, 2014, 09:26:48 PM

As if you pull up the 100Hz slider to the maximum... that should sound fun !  :gross:


That's pretty much how the original Beats Solo sounded.
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Anaxilus

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Re: Bakoon HPA-01
« Reply #33 on: October 13, 2014, 11:43:46 PM »
Quote from: Tor4 on October 13, 2014, 10:55:18 PM
Could the HD558 be even destroyed by an extremely inappropriate amp pairing? Like too extreme midbass for the drivers to take with some serious impedance mismatch...

We could try it.  I have a 558 I don't use laying around.

Honestly though, I have to say the HD600 sounds a lot better on the Bakoon current out than it looks.  It's much more articulate than most would think looking at the plot.  It's fast, hits hard.  Not bloomy and fat so I wouldn't judge it too harshly.  I do stand by my listening that I recommend the pairing for those who like that.  It's not Wow, this sucks bass, but wow this is crazy, kind of slammin' bass.
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ultrabike

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Re: Bakoon HPA-01
« Reply #34 on: October 14, 2014, 12:13:24 AM »
Well, the high order harmonics do seem to clean up on current mode...
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Elmura

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Re: Bakoon HPA-01
« Reply #35 on: October 14, 2014, 02:19:19 AM »
Interesting concept. A couple years ago I  simulated similar ideas and got poor results.

After reading some of the www.current-drive.info website, I did some new simulations. I still got relatively poor measurements vs the same amp driving by primarily voltage and current. Plus, a massive loss in output increasing with frequency.

The claims on the website seem very far fetched. The reality is that modern conventional high fidelity amplifiers drive the loudspeaker with both voltage and current (aka. Power)
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ultrabike

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Re: Bakoon HPA-01
« Reply #36 on: October 14, 2014, 02:49:10 AM »
Either way I think the amp will deliver power (both current and voltage) to the speaker.

Most drivers, given their frequency dependent impedance and sensitivity, seem to be designed for voltage drive. It kind of seems to boil down to what follows the impedance curve, the voltage or the current... add to that random sensitivity and voilá! ... err... and some random non-linear stuff here and there too...
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Elmura

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Re: Bakoon HPA-01
« Reply #37 on: October 14, 2014, 04:03:06 AM »
You know what - a fairly easy at home experiment is in order for all readers.

Simply apply a high resistance across positive and negative terminals of your amp, relative to your load.

So if you're using speakers & a speaker amp, apply say 2 x 40 Ohm resistors (5 x the nominal speaker impedance)

If you're using headphones, apply 5x the nominal impedance. eg. With my Senn HD800, 1.5k Ohm. W

What this does is send most of the current through the headphones / speakers, with much of the voltage dropped across the resistor.

Report back your findings
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Solderdude

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Re: Bakoon HPA-01
« Reply #38 on: October 14, 2014, 05:05:32 AM »
Quote from: Tor4 on October 13, 2014, 10:55:18 PM
Could the HD558 be even destroyed by an extremely inappropriate amp pairing? Like too extreme midbass for the drivers to take with some serious impedance mismatch...

No, it won't be destroyed, just sound very bloated, fat, bassy as the power (voltage) it can deliver is limited and the current at 90Hz will be the same as that on 1kHz (assuming both signals are present equally loud).

There is no impedance matching in headphones and speakers, there is for digital and HF (radio etc) transport.
In the audio range there is just voltage division.
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Use your ears to enjoy music, not as an analyser.

ultrabike

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Re: Bakoon HPA-01
« Reply #39 on: October 14, 2014, 05:10:58 AM »
Quote from: Elmura on October 14, 2014, 04:03:06 AM
You know what - a fairly easy at home experiment is in order for all readers.

Simply apply a high resistance across positive and negative terminals of your amp, relative to your load.

So if you're using speakers & a speaker amp, apply say 2 x 40 Ohm resistors (5 x the nominal speaker impedance)

If you're using headphones, apply 5x the nominal impedance. eg. With my Senn HD800, 1.5k Ohm. W

What this does is send most of the current through the headphones / speakers, with much of the voltage dropped across the resistor.

Report back your findings

I think I understand, but if the purpose is to emulate current drive I think a smaller resistor should be used relative to the load, when connected in parallel to the load as I think you described. <- this proly only works with current drive, which maybe what you mean.

One can proly achieve something similar using similar values to what you describe but perhaps in series with the load... Like I think was done here: http://www.changstar.com/index.php/topic,1554.msg42053.html#msg42053

Also note the Bakoon delivers more power in current mode than in voltage mode. So not sure what they are doing still.
« Last Edit: October 14, 2014, 05:44:24 AM by ultrabike »
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