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Confused with the VTV vs Buckeye 1ET7040 Amplifiers

simplywyn

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Several questions here: I recently bought a new set of R11's and they sound huge, I'm running them with one set of 1ET400 EVALs and they sound okay.

I'm looking for a power increase in the 1ET7040's but the VTV's show a 950W, the Buckeyes show a 700W. I'm a bit confused here as they both use the same power supply.

Anyone can shed some light into these implementations? What's buckeye doing differently that reduces the power by a whole 200W?

Also is it worth going these as I already have the Purifi EVAL1, is there a much better to upgrade to? (Benchmark AHB 2 perhaps, but they have lesspower)
 

Matias

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@Buckeye Amps can answer better.

Maybe you can try one out and see if it is worth it?
 

antcollinet

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What THD are each amplifier's power rated at?

Could also be a thermal limit on the Buckeye - or just conservatively rated.

Or - VTV are quoting the short term maximum power from the module data sheet. Buckeye may be stating what the module can do continuous in their thermal design.
 

Koeitje

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Ae you really running out of power with 1ET400's?
 

goryu

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Unless your speakers present a 2 ohm load, the 7040 purifi will do nothing for you. Buckeye's power rating at 2 ohms is less because he is derating the output due to the voltage of the Hypex power supply not being high enough to drive the Purifi module to full power at 2 ohms. VTV doesn't and if he is using the same Hypex power supply, his numbers are false.
 

NTK

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The VTV output power rating of 950 W @ 2 ohm requires a power supply voltage of >70 V. The Hypex SMPS1200A400 power supply only outputs 63 V typically, and therefore can only provide 700 W @ 2 ohm. The VTV spec is incorrect.

Anyhow, the difference between 950 W and 700 W is only 1.3 dB, which is just above noticeable.

purifi.png


It was discussed in the Buckeye Amps Purifi amp thread.
 
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simplywyn

simplywyn

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The VTV output power rating of 950 W @ 2 ohm requires a power supply voltage of >70 V. The Hypex SMPS1200A400 power supply only outputs 63 V typically, and therefore can only provide 700 W @ 2 ohm. The VTV spec is incorrect.

Anyhow, the difference between 950 W and 700 W is only 1.3 dB, which is just above noticeable.

View attachment 229570

It was discussed in the Buckeye Amps Purifi amp thread.
Thanks for this info, that makes sense now
 

Buckeye Amps

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As was answered, I am quoting "honest" power output since the SMPS1200A400 is a limiting factor. I will be adding a note to my website (without directly calling out any competitors).

The 7040SA is really ideal for those who have speakers that are under 4ohms
 
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simplywyn

simplywyn

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Ae you really running out of power with 1ET400's?
It's a good question - I just feel R11's lack bass, should I buy a pair of subwoofers instead?

The r11 dip to 3.5ohms around the bass area which is why I think it needs a bit more power
 

BrokenEnglishGuy

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It's a good question - I just feel R11's lack bass, should I buy a pair of subwoofers instead?

The r11 dip to 3.5ohms around the bass area which is why I think it needs a bit more power
if you find the R11 lack bass, add more bass with eq..
 

goryu

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It's a good question - I just feel R11's lack bass, should I buy a pair of subwoofers instead?

The r11 dip to 3.5ohms around the bass area which is why I think it needs a bit more power

You probably won't get anything more from the 7040 at 3.5 ohms to make it worthwhile. Would be a waste of money...
 

ryanosaur

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It's a good question - I just feel R11's lack bass, should I buy a pair of subwoofers instead?
@simplywyn
With a -6 at 30dB, it could be argued you don't need a Sub in a Music only rig...

I would add a Sub or two. ;)
 
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simplywyn

simplywyn

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It's potentially the room, I will try to do some treatment and get back.. if it's not the amp problem
 

BrokenEnglishGuy

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It's potentially the room, I will try to do some treatment and get back.. if it's not the amp problem
No.. Before measure your setup.. Then learn about Acoustics and then you can start to do some treatment.. If you dont know, better to pay profesional acoustic treatment.
But you can start doing some measurements and then use eq to fix or enhancement ur listening experience.
 
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simplywyn

simplywyn

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No.. Before measure your setup.. Then learn about Acoustics and then you can start to do some treatment.. If you dont know, better to pay profesional acoustic treatment.
But you can start doing some measurements and then use eq to fix or enhancement ur listening experience.

Chill out dude, I have tons of sound absorbtion panels and bass sinks already in my house I can move around lol, there's more than one way to do things.
 

antcollinet

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Chill out dude, I have tons of sound absorption panels and bass sinks already in my house I can move around lol, there's more than one way to do things.
Sure - but trial and error may or may not find and solve a problem. You may try everything you can think of moving absorption panels (and bear in mind most panels will do nothing for bass, and bass sinks can only go so low) and still think you are lacking bass - where a measurement will tell you immediately what is going on.
 
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simplywyn

simplywyn

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Sure - but trial and error may or may not find and solve a problem. You may try everything you can think of moving absorption panels (and bear in mind most panels will do nothing for bass, and bass sinks can only go so low) and still think you are lacking bass - where a measurement will tell you immediately what is going on.

Takes me 5 seconds to move some boards around and bass stuff.

Measuring takes me hours to google, finding a hardware, etc etc, sure maybe if you guys hvae all the time in the world.
 

Grotti

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Takes me 5 seconds to move some boards around and bass stuff.

Measuring takes me hours to google, finding a hardware, etc etc, sure maybe if you guys hvae all the time in the world.
For me it was ordering a UMIK microphone, downloading REW and borrow a mic-stand. And some reading how to use REW. The measurements were revealing!
 
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