 Rank: Administrator Joined: 15/07/2008(UTC)
Posts: 1,849
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D'Agostino Momentum loan
unofficially we have been lent a stereo Momentum
........... and quite a few of the good sound quality rumours are true!
It starts ice cold from switch on but soon warms up mightily under an enriched clas A/B regime
Sounds good from the off and then improves.........
I hope we can get it officially for review
MartinC
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 Rank: HIFI Guru Joined: 26/09/2008(UTC) Posts: 338 ![United Kingdom]( "United Kingdom") Location: Hasting/Crete/London Thanks: 1 times
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I'm going to have to invite myself around.
as a gift to excuse my presumptuousness I'll bring the younger D'Agostino's amps around. (They've landed)
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 Rank: HIFI Addict Joined: 18/09/2008(UTC)
Posts: 69
Location: Stockholm
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[quote=Martin Colloms;
I hope we can get it officially for review
MartinC[/quote]
Why do you need to get it 'officially' for review if you already have access to one?
Hans
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Rank: Administrator Joined: 15/07/2008(UTC)
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D'Agostino Momentum Stereo : a certain level of politeness goes a long way in publishing,
it was loaned on my request to try out with another product
the agent has complex schedules with reviewers who have copy dates to meet
we all try to fit in with each other, especially when stock is this costly
Martin Colloms
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Rank: HIFI Addict Joined: 18/09/2008(UTC)
Posts: 69
Location: Stockholm
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I understand.
I was a bit disturbed, before seeing your explanation, as I understand hifi-brands sometimes try to steer reviews to favourable reviewers and away from others.
Hans
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Rank: Administrator Joined: 15/07/2008(UTC)
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what you say is often true, and we try to fight that too
but not in this case .........
MartinC
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Rank: Administrator Joined: 15/07/2008(UTC)
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I will aim to get them in the next issue
Vol 6 no 4
(we are well under way with Vol 6 no 3)
Martin Colloms
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Rank: Administrator Joined: 15/07/2008(UTC)
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Got the D'Agostino Momentum Stereo.............
nice touch, the meters are more or less signal peak reading so are not slow old integrating VU meters.
They are also fairly accurate given the coarse graduations and parallaxed displacement between meter pointer and the scale!
Merely decorative ? not quite........
Just got from this 200+200W amplifier 820w/ 2ohm 1.2KW/ch into 1ohm on tone bursts !
And it is happy on full power short term at 200kHz with little distortion
Not much I suspect in the sonar stakes but this amp had better sound good as well.
It is clearly highly load tolerant.
Martin Colloms
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Rank: Administrator Joined: 15/07/2008(UTC)
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review done
you will have to wait and see..........
but , that meter window staring at me every time I open our site
thinks ..........?
there are switches for sensitivity/range , lamp brightness including extinguished , and off for the signal meters
I did not check if the sound was in any way affected by these settings
will try it now .....
MartinC
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Rank: Administrator Joined: 15/07/2008(UTC)
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Dan has taken care of this well
not a scrap of difference for any of the meter settings .....
MartinC
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Rank: Administrator Joined: 15/07/2008(UTC)
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review out in a few days
some interesting results
Martin C
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Rank: Administrator Joined: 15/07/2008(UTC)
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one result is that I find it hard to turn it off
and that is not the concealed micro-switch under the meter
Martin
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 Rank: HIFI Newbie Joined: 27/08/2011(UTC)
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Originally Posted by: Martin Colloms  one result is that I find it hard to turn it off
and that is not the concealed micro-switch under the meter
Martin Hello Sir , am thinking of mating my Marten Coltrane 2 with the Momentum Stereo . It is quite an easy load : Sensitivity / 89 dB / 1 m / 2.83V Impedance / 8 ohm (4.1 Ohm min), am quite sure the Stereo should be well up to the task . Was wondering if you had by an chance been able to compare the Mono- blocks to the stereo version . Power not being an issue , are there any SQ gains to be had . Would appreciate any feedback if possible . Thanks in advance.
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Rank: Administrator Joined: 15/07/2008(UTC)
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.... can only relate to equivalent Krell experiences
monos 'of the same type' have 'moderately' deeper more powerful bass , with a little more dynamic range and slam
the stereo is clearer, with wider sound stages , perhaps not quite so focused.
Put next to the speakers ( with very good mains cables ) there is another gain with short speaker cables.
they can sound like the power supply is doubled which of course it is.
Some feel that rhythm and timing is slightly less with monoblocks, I agree as a generalisation but not in every case.
Martin Colloms
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Rank: HIFI Guru Joined: 12/07/2009(UTC)
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Originally Posted by: Martin Colloms Put next to the speakers ( with very good mains cables ) there is another gain with short speaker cables. Although of course there is less cable in between, have you ever delved into something like what is described here? http://www.empiricalaudi...re-cable-resonances-realI can shorten my bass speaker cables from 3 to 1 metre, but was hesitant to do so because I did not understand transmission line effects. But this desciption shows that shortening will be good in the sense that the resonance will move upwards in frequency and probably be less harmfull.
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 Rank: HIFI Veteran Joined: 25/11/2008(UTC)
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Originally Posted by: frank23 Originally Posted by: Martin Colloms Put next to the speakers ( with very good mains cables ) there is another gain with short speaker cables. Although of course there is less cable in between, have you ever delved into something like what is described here? http://www.empiricalaudi...re-cable-resonances-realI can shorten my bass speaker cables from 3 to 1 metre, but was hesitant to do so because I did not understand transmission line effects. But this desciption shows that shortening will be good in the sense that the resonance will move upwards in frequency and probably be less harmfull. Well, if you've got an amplifier that produces 35nsec steps, and frequency contents in the MHz when reproducing bass audio then something is extremely wrong. None of what's in this article is new, and I deal with this sort of thing all the time. But then I AM transmitting data at many MHz, and have to ensure that the cable is properly terminated in its characteristic impedance. That's all the so-called Zapperator is, just an RC terminmation of the speaker cable, but of course you can't sell a general device like this because you need to know the characteristic impedance of the speaker cable, and this varies wildly from type to type. Rule of thumb: if the highest frequency transmitted is lower than 1/10 the reciprocal of the end-to-end transmission time then you've got nothing to worry about. For 20kHz that means a cable length around 1km-1.5km (depending on the propagation velocity in your particular speaker cable). just forget about it and concentrate on more meaningful things. Empirical Audio are just trying to blind you with science in order to sell you an expensive product. Edited by user 05 April 2013 23:31:35(UTC)
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Rank: HIFI Guru Joined: 12/07/2009(UTC)
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Originally Posted by: kengale Originally Posted by: frank23 Originally Posted by: Martin Colloms Put next to the speakers ( with very good mains cables ) there is another gain with short speaker cables. Although of course there is less cable in between, have you ever delved into something like what is described here? http://www.empiricalaudi...re-cable-resonances-realI can shorten my bass speaker cables from 3 to 1 metre, but was hesitant to do so because I did not understand transmission line effects. But this desciption shows that shortening will be good in the sense that the resonance will move upwards in frequency and probably be less harmfull. Well, if you've got an amplifier that produces 35nsec steps, and frequency contents in the MHz when reproducing bass audio then something is extremely wrong. None of what's in this article is new, and I deal with this sort of thing all the time. But then I AM transmitting data at many MHz, and have to ensure that the cable is properly terminated in its characteristic impedance. That's all the so-called Zapperator is, just an RC terminmation of the speaker cable, but of course you can't sell a general device like this because you need to know the characteristic impedance of the speaker cable, and this varies wildly from type to type. Rule of thumb: if the highest frequency transmitted is lower than the reciprocal of the end-to-end transmission time then you've got nothing to worry about. For 20kHz that means a cable length around 1km-1.5km (depending on the propagation velocity in your particular speaker cable). just forget about it and concentrate on more meaningful things. Empirical Audio are just trying to blind you with science in order to sell you an expensive product. Thanks, I really like having professionals from different area's posting here. It really gives you another perspective on things.
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Rank: Administrator Joined: 15/07/2008(UTC)
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Kengale:
''Rule of thumb: if the highest frequency transmitted is lower than the reciprocal of the end-to-end transmission time then you've got nothing to worry about. For 20kHz that means a cable length around 1km-1.5km (depending on the propagation velocity in your particular speaker cable). just forget about it and concentrate on more meaningful things. Empirical Audio are just trying to blind you with science in order to sell you an expensive product.''
I would point out that I think that the above comment is tilting at windmills since in my experience the cable issues are more to do with RFI and how the bits connected to the output port of the amplifier behave with respect to wideband radio interference, and how much is communicated to the amplifier.
Martin Colloms
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