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Old 08-30-2017   #51
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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Originally Posted by Swaglife81 View Post
Thanks, exactly what I wanted to know. It might have been the amps I used in the past but I was running a Fosgate 500x2 at 2 ohms vs 250x2 at 4 ohms but couldn't audibly hear a difference other than SPL. I understand an amp will work harder. I ran that amp for years. Aside from metering differences with various equipment seeing the difference how much difference can someone hear with 2 ohms vs 4 ohms given the same quality and power output is equal?
From Crown Audio Engineers; "Loudspeakers have a mind of their own. You send them a signal and they add their own twist to it. They keep on vibrating after the signal has stopped, due to inertia. That's called "ringing" or "time smearing." In other words, the speaker produces sound waves that are not part of the original signal. Suppose the incoming signal is a "tight" kick drum with a short attack and decay in its signal envelope. When the kick-drum signal stops, the speaker continues to vibrate. The cone bounces back and forth in its suspension. So that nice, snappy kick drum turns into a boomy throb. Fortunately, a power amplifier can exert control over the loudspeaker and prevent ringing. Damping is the ability of a power amplifier to control loudspeaker motion. It's measured in Damping Factor, which is load impedance divided by amplifier output impedance. High damping factor equals tight bass."
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Old 09-05-2017   #52
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Quote:
Originally Posted by manish View Post
Quote:
Originally Posted by norurb View Post
Check with theamplab.net, not sure if they are willing.
Thanks, I just sent them a RFQ. I will await there response.


***Update*** was quoted $75 a amp.
Did you send them in yet? Did you contact any other companies for quotes?
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Old 09-05-2017   #53
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

I didn't own one. I do have one coming now. Then I will grab another one. Then I plan to send one in have it done, then compare the 2. But I have a lot going on right now at work and at home. I'm thinking I might get the one done and send them to a trusted member to do some testing on them. And I only got a quote back from one place.

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Old 09-05-2017   #54
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

Question. In regards to the subwoofer channel x-over can it do full pass. If not what is the highest freq that is allowed on the mono channel? I'm asking because I want to run a active 3 way setup and use the mono channels for the mid-bass drivers. Of course using 2 5 channels.

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Old 11-01-2017   #55
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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Thank you to DeltaB. For those who are not sure what to order i have included my order sheet. Now my qty is for 2 amplifiers modifications, so just cut my qty in half for 1 amp. Now i'm searching for a shop to perform these upgrades.
I just put in my order to do one amp only. Can't wait to get this done. Thanks.
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Old 11-01-2017   #56
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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I just put in my order to do one amp only. Can't wait to get this done. Thanks.
So who are you having do the upgrade? I must have missed it.

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Old 11-01-2017   #57
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

I'll just do it myself. Hell with it I guess.
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Old 11-01-2017   #58
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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I'll just do it myself. Hell with it I guess.
Nice! Please take & post some pics, as I'd love to get the nerve up to try this too.

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Old 11-01-2017   #59
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

Will do.
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Old 11-01-2017   #60
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

Looking forward to that Norurb. I'm looking to do this on my 800.4's and trying to determine if I send it out or do it myself.

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Old 11-02-2017   #61
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

I'll start by saying that I think the JAD line from NVX is a great option for budget buyers. And I have recommended them to people asking for amp advice more times than I can count. I'm also all for improvements, but I wonder at what point, do you look at other options if SQ is your primary focus?

As an example, an upgraded JAD800.4 will likely cost you at least $300-325 for the initial amp purchase plus the upgrades if you need someone else to perform the work. Then take into account any addition shipping and you're likely upwards of $400 and probably with no form of warranty. But, you have a better small footprint, powerful, class D amp with a 10.4" x 6.7" footprint.

I would think depending on how important that small footprint and class D (efficiency) is to you, there may be better ways to spend the money if sound quality is your focus. While not as powerful and becoming harder to come by, the DLS CC-44 is an even smaller (85Wx4 @ 4 Ohms, 9.9"x5.0") class D with a great reputation for SQ. DLS was starting to make inroads in the US again when Chris Bennett was there. Since jumping ship to Audio Control, the brand has become stagnant stateside. The DLS CC-44 can still be had for under $400 to your door from ebay. I am not sure what their US distribution looks like right now.

If you're willing to sacrifice a little space, power and efficiency, there is also the Sony XM-GS4 (70Wx4 @ 4 Ohms, 10.75" x 8") at $250 and the Zapco ST-4X SQ (65Wx4 @ 4 Ohms, 12.6" x 6.3") at $190. Both of these amps have been praised for their sound quality.


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Old 11-02-2017   #62
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

Great advice. I guess I just like a challenge.
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Old 11-02-2017   #63
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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Originally Posted by DeltaB View Post
From Crown Audio Engineers; "Loudspeakers have a mind of their own. You send them a signal and they add their own twist to it. They keep on vibrating after the signal has stopped, due to inertia. That's called "ringing" or "time smearing." In other words, the speaker produces sound waves that are not part of the original signal. Suppose the incoming signal is a "tight" kick drum with a short attack and decay in its signal envelope. When the kick-drum signal stops, the speaker continues to vibrate. The cone bounces back and forth in its suspension. So that nice, snappy kick drum turns into a boomy throb. Fortunately, a power amplifier can exert control over the loudspeaker and prevent ringing. Damping is the ability of a power amplifier to control loudspeaker motion. It's measured in Damping Factor, which is load impedance divided by amplifier output impedance. High damping factor equals tight bass."
So not all amps are the same. I knew it...

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Old 11-03-2017   #64
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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Great advice. I guess I just like a challenge.
Much respect! I'll tell you what I'm pretty ok with a fine tip iron but I wanted to see what I was up against this morning.

I pulled out an old pbx card that had some SMD op-amps on it. Ran through removing, cleaning and replacing.... Ha! No way I'm doing this for 8 op-amps per amp. Just lining up the legs and traces properly and not moving them considerably during soldering was a major test of my patience.

Quote:
Originally Posted by rton20s View Post
I'll start by saying that I think the JAD line from NVX is a great option for budget buyers. And I have recommended them to people asking for amp advice more times than I can count. I'm also all for improvements, but I wonder at what point, do you look at other options if SQ is your primary focus?
I'm totally in agreement. Depending on what your requirements are I would almost always choose the Zapco.
In my case I love the clean black cosmetics and size of the NVX and you can't deny the power output of these guys. Compared to the Arc XDi and JL HD's I've heard I can't say that I feel slighted with the NVX.
At roughly $75 in labor per amp, for me, that is well worth it to have someone else do it. I could re-cap this guy all day but replacing op-amps.... now that I've done it first hand my time is worth more than that.

Next amps I plan on buying will be GaN FET based Class D as they get rolled out.

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Old 11-04-2017   #65
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

This is a very interesting thread. So you're saying I could get an 800.4 and throw a little bit of time and money into it I could have something comparable to an amp in the $1000 range? If I'm understanding this correctly than it would make no sense not to do this. Are there any other components that could be easily upgraded?
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Old 11-04-2017   #66
 
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It's never that easy but it does what it's supposed to, deliver lots of clean power. It will not cure poor speaker choices out shoddy install which is where you should focus your resources
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Old 11-04-2017   #67
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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It's never that easy but it does what it's supposed to, deliver lots of clean power. It will not cure poor speaker choices out shoddy install which is where you should focus your resources
Assuming high quality drivers are installed professionally. Is upgraded caps and op amps going to make a difference? This would be something i could easily do myself which is why it sparks my interest. I could spent 200 on an amp and 50 on parts. I have all of the tools already due to my profession. Instead of forking over 500 or more for a "high end" amp

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Old 11-04-2017   #68
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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Assuming high quality drivers are installed professionally. Is upgraded caps and op amps going to make a difference? This would be something i could easily do myself which is why it sparks my interest. I could spent 200 on an amp and 50 on parts. I have all of the tools already due to my profession. Instead of forking over 500 or more for a "high end" amp

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The greatest Achilles heel of the audio market is low quality op amps, especially in light of current advances in HU's. The TL072 has no place in audio equipment in light of the choices we have today. One of the selling points for Zapco for example, is certainly true in their marketing for the Z-LX line, where they use AD's OP275's in theirs. The OP275 and the Burr Brown OPA1642 are actually very close in design, with the AD being a through hole, and the OPA1642 SMD only. When you move your design into SMD, you can leverage much better designs for crosstalk, PSRR and CMRR. With open loop gains above 120db, it's dynamic range gets into home audio performance. It is marked and certainly quite audible. I certainly enjoy mine.
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Old 11-04-2017   #69
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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With open loop gains above 120db, it's dynamic range gets into home audio performance. It is marked and certainly quite audible. I certainly enjoy mine.
So you are using the NVX with upgraded components?

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Old 11-04-2017   #70
 
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Highly doubt anyone is doing that and I bet there is smd hell to deal with. He is using end game Zapco
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Old 11-04-2017   #71
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

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Highly doubt anyone is doing that and I bet there is smd hell to deal with. He is using end game Zapco
I have been modifying and refurbishing high end audio since the 70's. Was at Altec-Lansing in the late 80's and early 90's. There is no end-game other than sound quality.
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Old 11-04-2017   #72
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

ELNA developed new raw material for the separate paper which use a silk fibers.
Therefore, this capacitor can give you high grade sound for your audio design.
● Due to the silk fiber's pliability, the capacitor makes a dream of the high quality
sound.
For examples ;
● To relieve the music's vibration energy.
● To decrease the peak feeling sound at high compass and rough quality sound at
middle compass.


Lol. A quality cap is a quality cap... Not sure what they're replacing here but Elna is smoking the good stuff imo..

I'll stick with my Panasonic's

Opa1642 and 2209 are solid opamps for sure, I keep a stock of both. No argument there.

I'm more of a measurement (AP or Dscope) guy, listening is... hard to do objectivly. Psychoacoustics is rough. We hear what we want to.

Not suggesting the upgrades are pointless , just trying to keep things in perspective.

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Old 11-05-2017   #73
 
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

Quote:
Originally Posted by bnae38 View Post
ELNA developed new raw material for the separate paper which use a silk fibers.
Therefore, this capacitor can give you high grade sound for your audio design.
● Due to the silk fiber's pliability, the capacitor makes a dream of the high quality
sound.
For examples ;
● To relieve the music's vibration energy.
● To decrease the peak feeling sound at high compass and rough quality sound at
middle compass.


Lol. A quality cap is a quality cap... Not sure what they're replacing here but Elna is smoking the good stuff imo..

I'll stick with my Panasonic's

Opa1642 and 2209 are solid opamps for sure, I keep a stock of both. No argument there.

I'm more of a measurement (AP or Dscope) guy, listening is... hard to do objectivly. Psychoacoustics is rough. We hear what we want to.

Not suggesting the upgrades are pointless , just trying to keep things in perspective.
For signal path caps, ELNA sounds better than even MUSE. For power supply, I have used Panasonics, and in fact, on my 3000v DC power supply for use in transmitter usage on high frequency, I use Panasonics over Nichicon.
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Old 11-05-2017   #74
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

Quote:
Originally Posted by DeltaB View Post
For signal path caps, ELNA sounds better than even MUSE. For power supply, I have used Panasonics, and in fact, on my 3000v DC power supply for use in transmitter usage on high frequency, I use Panasonics over Nichicon.
Well I probably need to keep an open mind . Had more typed out, but meh.

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Old 11-05-2017   #75
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Default Re: My take on the NVX JAD 900.5 - 5 channel amp

I suppose, i'll get some too for my lab.. cheap enough. If nothing else, i can then say i use them.

20% irritates me, can hand match though and keep cmrr decent

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