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Old 19th January 2012, 01:18 PM   #11681
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Never pair B&W with Quad - It just doesn't work.

B&W do like the Hi-End Rotel topology.

The Nautilus likes the big Krell.

But whos got 33000 to spend on a second hand pair of B&W Nautilus. ?? NOT ME.

I was so fortunate a few years ago. One of my friends is a London property magnate. He was going on holiday and his house insurance didn't cover his Hi-Fi. I got to borrow a pair of B&W Nautilus that were six amped with KSA500s. NIRVANA but cost more than both my houses and the Jag added together.

Last edited by KatieandDad; 19th January 2012 at 01:21 PM.
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Old 19th January 2012, 01:33 PM   #11682
AndrewT is online now AndrewT  Scotland
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No, they are not 90dB/W @ 1m
They state 90dB/2.83Vac @ 1m and they imply their usual tolerance on sensitivity.

If one accepts that these 683 are 8ohms speakers then one will find that many 8ohm capable amplifiers will not perform at their best trying to drive the 683s to highish peak levels on transients.

If one were to instead read the specification and decide they are probably 4ohms to 8ohms speakers and select 4ohms capable amplifiers then you are likely to find that the same peak currents into transients, as demanded by the 683, will not cause as much if any problem.


I would look at 100W and above into 8r0 amplifiers and only select those that are capable of at least 180% of that rated power output into 4r0 and are stated as 4ohms capable as being likely candidates for your 683s.

The Aleph probably, or almost certainly, meets all of those conditions.
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Last edited by AndrewT; 19th January 2012 at 01:39 PM.
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Old 19th January 2012, 01:38 PM   #11683
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I don't think I'll bother with an F5 experiment.

As the A4 drives them BEAUTIFULLY - why waste money.
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Old 19th January 2012, 01:50 PM   #11684
AndrewT is online now AndrewT  Scotland
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The F5 will drive the 683s. I suspect that all that will feel different is the volume you hear. They will drive equally well but at a lower SPL.
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Old 19th January 2012, 01:50 PM   #11685
6L6 is offline 6L6  United States
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Quote:
Originally Posted by KatieandDad View Post
One DIY-er really hated his F5.
I've just got the building bug, his comments almost steer me away from trying an F5.
Yes, he didn't like his, but you must do a bit of reading between the lines with him.

His major complaint was a lack of power. He also says he has 91db speakers. This leads me to come to either of 2 conclusions - Either he built it wrong an it wasn't making full power (which I kind of doubt) or he likes his music really loud, and it just wasn't enough power. (My guess) I have worked in high-end stores. There are guys who like it silly loud.

It's the only negative review of the F5 out there. Don't be put off by it. The F5 is an amazing amp.
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Old 19th January 2012, 01:55 PM   #11686
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I do tend to use the A4 at 3 O'clock.

It's probably only pushing about 6W but it has the ability to transient at 100W.

It never gives up - its such a pleasure to listen to.

Have a look at the B1 builders thread. I've been spending silly money on my B1 and its lovely.

Last edited by KatieandDad; 19th January 2012 at 01:58 PM.
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Old 19th January 2012, 01:58 PM   #11687
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by KatieandDad View Post
A4 at 3 O'clock.
that volume control position only gives an indication of system gain for that source into that amplifier/speaker combination.

It is not an indication of too little power, nor of too little SPL.
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Old 19th January 2012, 02:01 PM   #11688
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Quote:
Originally Posted by AndrewT View Post
No, they are not 90dB/W @ 1m
They state 90dB/2.83Vac @ 1m and they imply their usual tolerance on sensitivity.

If one accepts that these 683 are 8ohms speakers then one will find that many 8ohm capable amplifiers will not perform at their best trying to drive the 683s to highish peak levels on transients.

If one were to instead read the specification and decide they are probably 4ohms to 8ohms speakers and select 4ohms capable amplifiers then you are likely to find that the same peak currents into transients, as demanded by the 683, will not cause as much if any problem.


I would look at 100W and above into 8r0 amplifiers and only select those that are capable of at least 180% of that rated power output into 4r0 and are stated as 4ohms capable as being likely candidates for your 683s.

The Aleph probably, or almost certainly, meets all of those conditions.

Can you equate that into dB/W sensitivity ?
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Old 19th January 2012, 02:02 PM   #11689
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Quote:
Originally Posted by AndrewT View Post
that volume control position only gives an indication of system gain for that source into that amplifier/speaker combination.

It is not an indication of too little power, nor of too little SPL.
I've had the 'scope across the speakers at that setting and it looks about 5.8W
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Old 19th January 2012, 02:13 PM   #11690
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by 6L6 View Post
Yes, he didn't like his, but you must do a bit of reading between the lines with him.

His major complaint was a lack of power. He also says he has 91db speakers. This leads me to come to either of 2 conclusions - Either he built it wrong an it wasn't making full power (which I kind of doubt) or he likes his music really loud, and it just wasn't enough power. (My guess) I have worked in high-end stores. There are guys who like it silly loud.

It's the only negative review of the F5 out there. Don't be put off by it. The F5 is an amazing amp.
I've heard many 5's and they all sound great. "personally" i really love my mini Aleph's even till this day.

very simple design low parts count, and not tons of heat or tons of power. 10-15watts ish.. ( depending on rail voltage..)
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