DIY thoughts of the day

A place for DIY project discussions.
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karatestu
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Re: DIY thoughts of the day

Unread post by karatestu »

This is a quote i found (not from a forum)

8) Some speaker companies that tell the consumer their speakers use the simplest crossovers possible to preserve phase coherence and that they build better drivers to match each other for optimal integration.
In an ideal world, it may be possible to design a linear phase coherent loudspeaker system with a moderately complex series first order crossover by implementing high quality low Q drivers and crossover elements in slanted transmission line enclosures. However, in reality, many of these companies who claim phase coherence are using poor quality OEM metal cone drivers that have harsh break-up modes. These types of drivers require more than just a first order crossover to eliminate these break-up modes, and do nothing to address the enclosure type and baffle alignment to linearize the system's response.

In addition, it is usually cost prohibitive for many manufacturers to offer a properly designed loudspeaker at a competitive price using this approach. In reality, there are many variables such as cabinet properties, baffle alignment, driver sensitivity, etc, that have a synergistic affect sometimes requiring additional compensation in the crossover design or enclosure design for optimization. There are also inherent trade-offs to designing these type of speakers (i.e. drivers firing at the listening position off-axis, limited vertical dispersion and power handling, etc).

Many loudspeaker manufacturers and experts today consider proper phase coherent speakers to be somewhat of a myth considering the limiting factors of room acoustics, listening position, and quality of the source, and may also choose not to implement these type of designs for commerical considerations or to avoid compromising the design of the product.
DIY inspired by Richard "The Doc" Dunn RIP

Daniel Quinn
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Re: DIY thoughts of the day

Unread post by Daniel Quinn »

I wish Richard was alive.

Lurcher300b
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Re: DIY thoughts of the day

Unread post by Lurcher300b »

I believe that the reproduction of frequencies well beyond the range of human hearing effect our enjoyment of music and think that the extent to which it occurs varies from individual to individual. I think this goes some way to explaining why many prefer vinyl to CD. The 44 kHv cap is too low.
Its a belief, and so I guess has no requirement of evidence. Not sure where this idea of there being much information from vinyl above 20kHz comes from though.

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CN211276
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Re: DIY thoughts of the day

Unread post by CN211276 »

Lurcher300b wrote:
Tue Feb 18, 2020 1:10 pm
I believe that the reproduction of frequencies well beyond the range of human hearing effect our enjoyment of music and think that the extent to which it occurs varies from individual to individual. I think this goes some way to explaining why many prefer vinyl to CD. The 44 kHv cap is too low.
Its a belief, and so I guess has no requirement of evidence. Not sure where this idea of there being much information from vinyl above 20kHz comes from though.
I am not aware of any explanation and am also in the dark about amplifiers and speakers being able to reproduce frequencies way outside the range of human hearing. I suppose kit with less getting in the way stands a better chance and this could be a reason why NVA sounds so good.
System: DC Blocker, NVA BMU, Cisco 2960G, Sonore MicroRendu/MCRU PS, AQ Jitterbug, ifi iPurifier 3, Chord Mscaler, Chord Qutest/MCRU PS, NVA P90SA Mk2, NVA A80s Mk3, NVA Cube 1s, NVA TSCS, NVA TIS, Blue Jeans dual BNC, AQ Carbon USB, Cat 8 ethernet.
HP:Grado SR 325e, Chord Mojo.
Analogue: Rega Planar 3, Denon DL-110, NVA Phono 1, NVA SSP.
Second System:NVA P20, NVA A20, NVA Cubettes, NVA LS3, NVA SSC, Arcam Miniblink or Mojo.
Out:Oppo PM3, AQ DF Red.

RIP Doc

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Re: DIY thoughts of the day

Unread post by Lurcher300b »

I suppose kit with less getting in the way stands a better chance and this could be a reason why NVA sounds so good.
Maybe, Savvy will know for certain, but at least the old reviews of NVA amps indicated that they were slew rate limited at higher frequencies.

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karatestu
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Re: DIY thoughts of the day

Unread post by karatestu »

....everyone runs off to look up what slew rate means................ :lol:
DIY inspired by Richard "The Doc" Dunn RIP

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karatestu
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Re: DIY thoughts of the day

Unread post by karatestu »

Daniel Quinn wrote:
Tue Feb 18, 2020 1:06 pm
I wish Richard was alive.
Me too.
DIY inspired by Richard "The Doc" Dunn RIP

Alfi
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Re: DIY thoughts of the day

Unread post by Alfi »

karatestu wrote:
Tue Feb 18, 2020 3:14 pm
Daniel Quinn wrote:
Tue Feb 18, 2020 1:06 pm
I wish Richard was alive.
Me too.
+2.

He was a genius with respect to the reproduction of music via audio equipment and very knowledgeable in many other areas too. Highly respected by me despite us not exactly getting on when I first got to know of NVA.

RIP Richard.

Alfi.
Heavily modified not really suspended sub-chassis turntable, Sole VIII sub-chassis, "In Sole" polymer suspension, Ai bearing, Alphason HR100MCS, AT 33PTG, Norton Airpower clone. Technics SL110A, AT 1005, Soundsmith Denon DL103. Voyd the Voyd, ATP-12T, AT 33PTG. NVA BMU, NVA Phono2 MC & DIY "Big B'stard" PS, NVA P50 SA, DIY "Second Statement alike" power amp, custom birch ply Allison 6/NVA Cube 1 clones, NVA TIS mk2 , SSC, LS6.

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CN211276
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Re: DIY thoughts of the day

Unread post by CN211276 »

Alfi wrote:
Tue Feb 18, 2020 6:32 pm
karatestu wrote:
Tue Feb 18, 2020 3:14 pm
Daniel Quinn wrote:
Tue Feb 18, 2020 1:06 pm
I wish Richard was alive.
Me too.
+2.

He was a genius with respect to the reproduction of music via audio equipment and very knowledgeable in many other areas too. Highly respected by me despite us not exactly getting on when I first got to know of NVA.

RIP Richard.

Alfi.
Miss him a lot. My regret is not being aware of him and NVA a lot sooner.
System: DC Blocker, NVA BMU, Cisco 2960G, Sonore MicroRendu/MCRU PS, AQ Jitterbug, ifi iPurifier 3, Chord Mscaler, Chord Qutest/MCRU PS, NVA P90SA Mk2, NVA A80s Mk3, NVA Cube 1s, NVA TSCS, NVA TIS, Blue Jeans dual BNC, AQ Carbon USB, Cat 8 ethernet.
HP:Grado SR 325e, Chord Mojo.
Analogue: Rega Planar 3, Denon DL-110, NVA Phono 1, NVA SSP.
Second System:NVA P20, NVA A20, NVA Cubettes, NVA LS3, NVA SSC, Arcam Miniblink or Mojo.
Out:Oppo PM3, AQ DF Red.

RIP Doc

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karatestu
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Re: DIY thoughts of the day

Unread post by karatestu »

Anyone remember the Naim prefix phono stage ? Oh no you say i was trying to forget that regrettable period of my hifi history. Well don't forget part of its charm and what put it at the top of the Naim phono stage tree until the Superline came along was the fact that it was mounted in the LP12. Very short wires from the cartridge to the phono stage was its biggest plus point.

How about putting a NVA phono board in the record deck. Doesn't have to be an LP12 (thank god) as long as there is room. Enclose the amp board and regulators in a small steel box to keep noise and interference out and have the psu remote.

I am currently thinking about it (not the first tme) and Mr San Miguel is the man who says yes.
DIY inspired by Richard "The Doc" Dunn RIP

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