[tp1]

To try to choose between HK 525 and Denon 3803, I'm trying to figure out whether 100MHz video switching is necessary (the 3803 has 100MHz, while the 525 has 50, I think; See http://timefordvd.com/hardware/recei...onChart.shtml, --i think i saw a similar chart somewhere around here).


The salesman at GG was adamant that you can't switch HD signals with less than 100.


OTOH, Tom_Bombadil's 10/12 comparison of sub $1000 receiver mentions that 35 MHz might be passable for most HD signals. That makes me think that 50 MHz would clearly be sufficient.


In trying to research this issue further, I also came across this website:

http://home.att.net/~rfowkes1/Compon...Switching.html


that posts an article from outlaw audio saying 40 to 50MHz is sufficient. (I think its about this topic ).


Any comments?

Thanks

TP

 

[Greg_R]

It depends on what format of HD switching you require (720p, 1080i, 1080p, etc.). Also, keep in mind that many display devices are incapable of fully resolving HD in the first place (i.e. the loss in the switcher will be imperceptible). Just because a device can accept 1600x1200 doesn't mean it is fully resolving that resolution.


I guess I'm saying that 50Mhz should be adequate unless you have a high end video setup.

 

[tp1]

Thanks Greg.

Has this issue been discussed in any of the previous threads?

Do you know of any other sources that discuss this?

 

[Addicted Help!!]

50 will cover 480p but not 720p or 1080i without signal loss, so it depends what you are going to switch thru it, and if the connections support the bandwidth, which since I don't use receivers, I have no way to know.


It also depends if for HD switching even if it will do it, if you are planning on doing it for that? I would not because receivers have way to low level insulation, and too much internal noise to put such a great signal thru unless you had no choice.

 

[Joel Solid]

Quote:

50 will cover 480p but not 720p or 1080i without signal loss

I don't agree with that statement. I think that 50hz is plenty of bandwidth to cover 720p and 1080i. I think any true connection above 35hz is where you need to be.


Joel

 

[Johnla]

I think 50 will do it, but the ones that have 100 have the added insurance that it will do so without any surprise "gotcha" type problems. (In theory that is)........

Because as we all know, what should work, don't always work as planned!

 

[tp1]

Thanks for the replies.

It seems different people have different takes on this one.

AH, I had not heard about not switching HD signals through the receiver.

I look into this issue more as well as the badwidth issue, and will let you know if I find anything interesting.

 

[dirk1843]

Tp1,


I think this subject is one you will never find a good answer for. Since component switching first became mainstream, experts(no offense to anyone here of course) have been giving different figures as to the required amount of bandwidth.


Since there is no standard for measurement of this type, the numbers are only vague references anyway. And as stated before depending on your type of display you may not even be able to resolve full max 1920x1080i resolution(not many here can).


All in all I wouldn't base my decisions on the reciver based on this alone. If the one you like has only 50mhz, get it!! If you don't notice a problem with PQ, then great. If YOU notice some problems, then run your video straight to the display or by a standalone switcher which will probably perform better anyway.

 

[Joel Solid]

My receiver is at 60hz and I don't see any difference in a my latest A/B comparison. My Hit XWX20b has been ISF Calibrated so I usually can see any changes in picture quality with my set.


Joel

 

[slb]

Joel is correct. 37MHz bandwidth meets the requirements of both 720p and 1080i, and there is apparently only a slight degradation visible at 25MHz bandwidth on most currently available displays. If/when you have 1080p capable equipment, you'll need at least double the bandwidth.


-Steve

 

[HAN]

Here's a good link... http://hometown.aol.com/ajaynejr/bandwid.htm

 

[tp1]

Thanks for all the posts. The last link was great.