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rasmusn@rasmusn.dk
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Scott Dorsey
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 Posted:
Mon Nov 07, 2005 9:54 pm Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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rasmusn@rasmusn.dk <rasmusn@rasmusn.dk> wrote:
| Quote: |
Will a Crown D-75A be a good choice for my Dynaudio BM6 monitors? - I
can get a really good deal on one.
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No. The top end on it is so smeary, it makes even an RA-100 seem good.
| Quote: | Is has 55W in 4 ohms, according to the specs. the BM6s require 40W - is
the Crown powerful enough?
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The Crown is more than powerful enough. The only problem is that it
doesn't sound good.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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Bigguy
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| Posted:
Mon Nov 07, 2005 10:09 pm Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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Second this... very reliable amp - but it sounds muddy and confused.
It's an ancient design using poor op-amps... but it is solidly made ;-)
Guy
"Scott Dorsey" <kludge@panix.com> wrote in message
news:dkntbp$r66$1@panix2.panix.com...
| Quote: | rasmusn@rasmusn.dk <rasmusn@rasmusn.dk> wrote:
Will a Crown D-75A be a good choice for my Dynaudio BM6 monitors? - I
can get a really good deal on one.
No. The top end on it is so smeary, it makes even an RA-100 seem good.
Is has 55W in 4 ohms, according to the specs. the BM6s require 40W - is
the Crown powerful enough?
The Crown is more than powerful enough. The only problem is that it
doesn't sound good.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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Scott Dorsey
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| Posted:
Mon Nov 07, 2005 10:11 pm Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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Bigguy <gtittley@remove.hotmail.com> wrote:
| Quote: | Second this... very reliable amp - but it sounds muddy and confused.
It's an ancient design using poor op-amps... but it is solidly made ;-)
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Yes, it has one of those wacky 14-pin Raytheon op-amps, but don't blame
the op-amp for the bad sound. It's only an innocent bystander, and if
it is better used, it can actually sound decent.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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Skeeter
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| Posted:
Mon Nov 07, 2005 10:20 pm Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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Hi Rasmus,
Please notice that the Crown D75 amplifier power rating from 20 to 20k
is 45 watts at 4 ohms. Only at 1kHz does it claim to deliver 55 watts
at 4 ohms. The Dynaudio monitors claim an average SPL of >94dB at 1.5m
@ an unqualified 40 watt input.
If the D75 is pushing an average of 40 watts per channel to sustain
this SPL of >94dB, and it is rated for 45 watts maximum clean power for
full spectrum sound (20 - 20k), this leaves very little headroom for
transient peaks in the program material.
Important things to notice regarding the Dynaudio speakers is the 86dB
sensitivity spec (a little inefficient), and the stated MINIMUM amp
power of 40 watts. Also all the SPL specs are stated as "short term
peak values". These are not to be associated with real world average
SPL delivery on a consistent basis.
Transient peaks in musical program material will demand on average
about 3 to 6dB of headroom to be reproduced cleanly, without clipping
compression. This means that the little Crown will be asked to deliver
between 80 to 120 watts per channel for brief moments at the >94dB SPL.
I think it a little much to expect that this combination will sound
clean at this level. Realistically, I would expect that this
combination of amp/speakers would deliver an approximate 89 to 91dB
level at the 1.5m near field distance.
It really depends on how loud you need or want your near field mix to
be. For an average control room mix, this 89 to 91dB level is fine...
as far as I'm concerned. For some other production people, it would
not be. I have been in control rooms that average around 95 - 100dB at
times. It's a matter of personal preference, and perhaps an amount of
individual hearing damage.
In closing, this combination would work for me. The little Crown is a
real clean amp with fairly generous headroom and capacitance. The
Dyanaudio speakers are also pretty accurate for the price level. I
could live with a control room at 89 - 91dB of clean, accurate sound
pressure.
All the best to you.
Skeeter |
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Fletch
Guest
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| Posted:
Tue Nov 08, 2005 2:34 am Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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Scott Dorsey wrote On 11/07/05 08:11,:
| Quote: | Bigguy <gtittley@remove.hotmail.com> wrote:
Second this... very reliable amp - but it sounds muddy and confused.
It's an ancient design using poor op-amps... but it is solidly made ;-)
Yes, it has one of those wacky 14-pin Raytheon op-amps, but don't blame
the op-amp for the bad sound. It's only an innocent bystander, and if
it is better used, it can actually sound decent.
--scott
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This is rather interesting because I have an old D-60 that sounds positively great all the way
through the spectrum, though it is being used as part of my video rig in the living room.
Is there a difference in the makeup of these amps?
--fletch |
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Skeeter
Guest
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| Posted:
Tue Nov 08, 2005 3:50 am Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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Hi Scott,
The old Crown D-60 is very similar to the D-75. The D-75 was an
evolutionary change to enable a bit more power. The entire D series of
Crown amplifiers use very similar circuitry and configuration. Very
flat response from 100kHz down to DC, laboratory quality distortion
figures, and damping factors of 400 to 1000.
I too have an old D-60 that I use to power my Stax electrostatic
headphones. I've been using it since 1976. They are built like little
armored cars. The "sound", or lack of such is usually the norm for the
D series of Crown amplifiers. Very quiet, very detailed and open
representation of the program material.
The only annoying aspects of the D series Crowns that I can testify to
is that they weigh a ton compared to similarly spec'd amps, and the
instantaneous transient response is a little slow and compressed
sounding on material with huge, instant variations in volume, and they
were usually pretty expensive. I prefer Bryston for FOH vocals.
The bass response is very tight and defined. The power supply is
laboratory spec with ample capacitance. Great little amps.
Mostly I find people complain about the sound of Crown when they
unwittingly overdrive the amplifiers into undue distortion. A little
30 to 45 watt per channel amp usually ends up getting "leaned on" a bit
excessively powering most control room type of speakers.
I still have 3 Crown D series amplifiers in my rig. The D-60 for my
headphones, a D-150A bridged in mono for a monitor string, and a PSA-2
(still a derivative of the D series) also bridged in mono powering 2 EV
18" sub bins. All of them run very clean and reliably. No one
complains about the sound.
All the best to you,
Skeeter. |
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Scott Dorsey
Guest
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| Posted:
Tue Nov 08, 2005 5:42 am Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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Fletch <geoffSPAMarnold@hotmail.com> wrote:
| Quote: | Scott Dorsey wrote On 11/07/05 08:11,:
Bigguy <gtittley@remove.hotmail.com> wrote:
Second this... very reliable amp - but it sounds muddy and confused.
It's an ancient design using poor op-amps... but it is solidly made ;-)
Yes, it has one of those wacky 14-pin Raytheon op-amps, but don't blame
the op-amp for the bad sound. It's only an innocent bystander, and if
it is better used, it can actually sound decent.
This is rather interesting because I have an old D-60 that sounds positively great all the way
through the spectrum, though it is being used as part of my video rig in the living room.
Is there a difference in the makeup of these amps?
|
Not too huge a difference. I'd tend to characterize the D-60 as being the
worst of the bunch, too. What speakers are you driving with it?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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SSJVCmag
Guest
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| Posted:
Tue Nov 08, 2005 5:42 am Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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On 11/7/05 11:11 AM, in article dknuao$qa8$1@panix2.panix.com, "Scott
Dorsey" <kludge@panix.com> wrote:
| Quote: | Bigguy <gtittley@remove.hotmail.com> wrote:
Second this... very reliable amp - but it sounds muddy and confused.
It's an ancient design using poor op-amps... but it is solidly made ;-)
Yes, it has one of those wacky 14-pin Raytheon op-amps, but don't blame
the op-amp for the bad sound. It's only an innocent bystander, and if
it is better used, it can actually sound decent.
--scott
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Hey... Is there an avenue to follow and if so is it reasonable to upgrade a
D-60?
There's more than one here... |
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SSJVCmag
Guest
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| Posted:
Wed Nov 09, 2005 3:57 am Post subject:
Re: Crown D-75A and Dynaudio BM6 monitors |
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On 11/8/05 11:53 AM, in article cvk1n1tmtrea9vhdcpkhabg59b604eijb7@4ax.com,
"Frank Vuotto" <deepthrob@gmail.com> wrote:
| Quote: |
Hey... Is there an avenue to follow and if so is it reasonable to upgrade a
D-60?
Some years ago I changed out the opamp on a D60 with a 2406 (ignoring
the bypass and feedback pins), and while it worked fine, it didn't
improve the sound any.
On the other hand, I used that amp for 10 years with a pair of JBL
control 1's and it worked just fine with those speakers from blasting
to whisper levels.
On the other, other hand, I once used it to replace a friends small
ailing Adcom (a pleasant sound driving Titans) and that was just
godawful.
Frank /~ http://newmex.com/f10
@/
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Sigh.. I guess sometimes it doesn;t MATTER how much you WANt the bird in the
hand to be worth 2 in the bush... |
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