Απάντηση: Re: Ρυθμιση avr 4100 βοήθεια
Συγγνώμη που θα φανώ ξανά ο κακός της παρέας, αλλά μπορεί να μου πει κάποιος γιατί θα πρέπει κάποιος που δεν διαθέτει THX certified speakers THX certified Subwoofer και THX certified Amplifier, να ορίσει όλα του τα ηχεία small και το crossover στα 80hz έτσι απλά αβασάνιστα?
γιατι τα λεει η ιδια η audyssey (χωρις ν αναφερει για thx ή όχι) για small ή large:
From the Audyssey FAQ: c)3. I have big tower speakers at the front. Shouldn't I set these to 'Large'?
(This answer assumes you have a subwoofer in your system.)
Small and Large in this context are really misnomers. Rather than describing the physical size of the speakers, what it really means is that some speakers can reproduce lower frequencies more efficiently than others. So-called 'full range' speakers might go down as low as 30Hz - but the problem is, if they do, they won't usually go down very low AND very loud at the same time. Movies call for very deep bass - often 20Hz or even lower - at very high Sound Pressure Levels - 115dB at 'Reference Level'.
Also, remember that if you set your main speakers to Large, you are bypassing the bass Management in your AVR and sending no sound at all (apart from the .1 Low Frequency Effects channel) to your sub. Your sub has been specifically designed to handle bass frequencies and will almost certainly do so better than your main speakers. Manufacturers' specs for bass performance are wildly exaggerated and often made for purely marketing reasons. You bought your sub for a reason - so make the most of it!
Για crossover στα 80 :
From the Audyssey FAQ: c)2. Why do I often see advice to raise the Crossovers to 80Hz?
Audyssey has simply 'listened' during the measuring phase and reported the -3dB point of the frequency response to your AVR. What this means is this: when Audyssey sends the test chirps it will measure the frequency response of your speaker and find where it starts to roll off (i.e. become 'less loud'). When Audyssey detects the point at which the frequency response is down by 3dB ('the -3dB point') it stops trying to correct for the in-room response. So if, for example, your speaker is -3dB down at 50Hz, Audyssey will detect that and will only apply the EQ down to 50Hz. Audyssey will not correct below 50Hz for fear of boosting the lower frequencies beyond the capabilities of your speaker and damaging it.
It is then the responsibility of the AVR manufacturer to decide what to do with that information. In some cases, if the -3dB point is, say, 40Hz, the AVR will set the speakers to Large. In other cases, the same situation will result in the speakers being set to Small with a 40Hz Crossover set in the AVR menus. In addition, Audyssey takes into account the placement of the speakers in the room and the room characteristics itself when evaluating the -3dB point. So if your speakers are in a corner, for example, they will deliver more perceived bass than if they are out in the open because the room reinforces' the bass. All of this will influence the Crossover that is actually set. You can leave the Crossover to where it was set if you wish. However
There are various good reasons to use a Crossover of 80Hz or thereabouts:
By doing so, you will relieve the strain on the main speakers from trying to reproduce very low frequencies. This can help the speakers perform better in the mid and higher frequencies.
By doing so you also relieve the considerable strain on the amplifier that it experiences when trying to produce very high Sound Pressure Levels at very low frequencies, such as often found in movie content. It takes simply huge amounts of amplifier power to generate 115 dB at 20Hz or even lower - the amp in the subwoofer has been designed in conjunction with the subwoofer itself to drive the speaker to those levels at those frequencies. By handing off these frequencies to the sub, it greatly eases the strain on your AVR or external amplifier and this will have a beneficial effect on the way it drives the other speakers in the system.
By using a dedicated sub (or subs) to produce the low bass, you are also able to place the sub/s in the optimum room position with regard to room modes. Front speakers have to be positioned for imaging and the best place for a bass speaker is not usually the best place for imaging. By crossing over to a sub at 80Hz, you can place the main speakers in the best place and also the sub in the best place too.
If you have Audyssey XT or MultEQ, the filter resolution for the sub channel is much higher than it is for the satellites, so handing more of the frequencies off to the sub lets you benefit from that greater filter resolution over a wider range of frequencies. With XT32, the filter resolution for the sub channel is the same as for the satellites, so that consideration doesn't apply to anyone fortunate enough to have XT32.
Do not lower the crossovers however. If you do, you will have an uncorrected 'hole' in your frequency response between what Audyssey set and what you have lowered the crossover to.
