The **OFFICIAL** DENON AVR-4520CI thread - Page 410 - AVS | Home Theater Discussions And Reviews
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post #12271 of 12281 Old Yesterday, 02:37 PM
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WARNING! This post requires deeper technical knowledge.
The info could be interesting for those using external amps.

Unlike the Marantz models, the Denon 4520 does not buffer the analog signals.
In the process of retrofitting buffers into the 4520 I discovered THIS: Parts of the PreOut circuits are back-to-front.

I waited until the model's end-of-life before disclosing this info just to avoid being flamed. I hope the info can be put to good use.
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post #12272 of 12281 Old Yesterday, 03:19 PM
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Quote:
Originally Posted by doognam View Post
WARNING! This post requires deeper technical knowledge.
The info could be interesting for those using external amps.

Unlike the Marantz models, the Denon 4520 does not buffer the analog signals.
In the process of retrofitting buffers into the 4520 I discovered THIS: Parts of the PreOut circuits are back-to-front.

I waited until the model's end-of-life before disclosing this info just to avoid being flamed. I hope the info can be put to good use.
Just because the 4520 is at end-of-life doesn't exempt you from being flamed. You drop this turd, yet you don't elaborate on what impact your discovery has, and how it might affect the many users who still have this AVR. TBH, I cannot understand your motivation.
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post #12273 of 12281 Old Yesterday, 03:31 PM
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Originally Posted by AustinJerry View Post
...You drop this turd, yet you don't elaborate on what impact your discovery has, and how it might affect the many users who still have this AVR. TBH, I cannot understand your motivation.
Motivation:
I thought this is an Audio-Video SCIENCE FORUM.
@AustinJerry , what is wrong with a scientific and informative post about the avr4520?

My motivation is to give actionable technical information that could be very useful for those with enough technical ability so that they could improve their 4520s. It could be very easy for them to fix the fault and noticeably improve the sonic qualities of the 4520.
For those adventurous enough, they can extend its useful life by making it sound better by fixing its faults that negatively affect the sq, IF THEY WISH. If the attempt fails in a disaster then perhaps its time to update to a new model (as it is at its eol anyway).

As to how it may affect the many users - imo, it all depends. Those who want this kind of technical info and even unsavoury truth they would be satisfied if not thankful that they got it. To those that cannot handle it, what can I do? The facts remain.

Last edited by doognam; Yesterday at 07:21 PM. Reason: add example of use this info
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post #12274 of 12281 Old Yesterday, 03:32 PM
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I've never filed a complaint with the BBB - but not sure what else to do, and this situation has been one to file for --- if I ever had one.
They're just a private sales oriented organization doing semi-strong arm sales tactics on businesses with limited public benefit. Getting accredited means buying in so you can get higher ratings. Pseudo government name (bureau my ass). Reminds me of some of the charlatans in audio. Waste of time and money IMHO. You could do more damage to Denon's rep right here on AVS....
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post #12275 of 12281 Old Yesterday, 09:56 PM
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We have just setup my old 4520 that I used to use in my cinema, now in the lounge. This time we set it up without RS232 on the ipad.


Ive found that we have very Unreliable IP Control. Sometimes when I turn everything on the 4520 will come on, sometimes not. When I shutdown everything, sometimes the 4520 will shutdown, sometimes not.....


Its all very hit and miss!


Has anyone else had a similar issue?

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post #12276 of 12281 Old Today, 10:33 AM
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Quote:
Originally Posted by doognam View Post
Motivation:
I thought this is an Audio-Video SCIENCE FORUM.
@AustinJerry , what is wrong with a scientific and informative post about the avr4520?

My motivation is to give actionable technical information that could be very useful for those with enough technical ability so that they could improve their 4520s. It could be very easy for them to fix the fault and noticeably improve the sonic qualities of the 4520.
For those adventurous enough, they can extend its useful life by making it sound better by fixing its faults that negatively affect the sq, IF THEY WISH. If the attempt fails in a disaster then perhaps its time to update to a new model (as it is at its eol anyway).

As to how it may affect the many users - imo, it all depends. Those who want this kind of technical info and even unsavoury truth they would be satisfied if not thankful that they got it. To those that cannot handle it, what can I do? The facts remain.
Do you have this receiver, @doognam ?
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post #12277 of 12281 Old Today, 01:13 PM
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Originally Posted by laserjock II View Post
Do you have this receiver, @doognam ?
Yes
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post #12278 of 12281 Old Today, 01:37 PM
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Originally Posted by AustinJerry View Post
...
yet you don't elaborate on what impact your discovery has...
@AustinJerry, it appears like you did not read the second attachment of my post. Anyway, since it is supposed to be for those with deeper technical knowledge, the impact in layman's terms is like "how 100 meters of cheaper audio cable load or make any unbuffered pre-amplifier struggle driving audio signals thru it". That is a guesstimate reckoning at 4.7pf per meter of cable.
The avr4520's volume control/pre-amps are, by a fault in design or execution, already capacitively loaded with 470pf without even an inch of cable attached.

That is the unsavoury truth.
Anyway, it could be actioned upon, if one so wishes, if one has the technical ability or financial resources to do so.

Last edited by doognam; Today at 01:48 PM.
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post #12279 of 12281 Unread Today, 03:44 PM
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I have about 2.5 yrs left on my warranty so I'll just live with it the way it is or trade it in when I decide to go the pre-pro route.

Does the Marantz 8801 have this same "flaw"?
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post #12280 of 12281 Unread Today, 04:05 PM
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Originally Posted by laserjock II View Post
I have about 2.5 yrs left on my warranty so I'll just live with it the way it is or trade it in when I decide to go the pre-pro route.

Does the Marantz 8801 have this same "flaw"?
I do not have the detailed schematics nor a 8801 unit. I only have its concept diagram so I can only speculate as to its nitty-gritty details.

Most likely not because the 8801 implementation uses the much touted Marantz HDAM buffers that fortifies the relevant downstream circuitry in order to drive whatever kind of cables and amps you connect to it.
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post #12281 of 12281 Unread Today, 06:37 PM
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Originally Posted by Glenn Baumann View Post
I feel for ya man!

Did you pay for the 4520 with a credit card?

If so, I would contact your credit card company and tell them the story! There is a very good chance that they might back you and if no joy ultimately allow you a charge back to recoup your funds.

...Glenn
Yeah,
I did. I bought it from Amazon though. I wonder how a chargeback works through Amazon? I know I've heard of people getting their account permanently banned for like from ebay/paypal for using a credit card chargeback. I use Amazon too much to have something like that happen. I'm hoping Denon will take care of me, but I doubt they will because they didn't on the last ticket - they just closed it, and they didn't respond to me yesterday, (Saturday, when they were open.)

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