NAD 7080 Find

Ric27

Ric27

Journeyman
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Aug 4, 2014
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Location
Williamson Co. Tennessee
Tagline
Super Cool but don't know it.
NAD 7080.jpg

A couple of weeks back I made my cursory cruse through the electronic display at the local thrift shop. Not much as usual then over by the TV's I spot something real big with lots of knobs, buttons, switches and dials. It was a NAD 7080, flagship of the mid seventy's NAD receivers. I've read some seriously differing reviews on this unit but I have to say it does sound nice, has a ton of power an everything works with not even a scratchy pod. I like the military eq look and it pushes a pair of Large Advents with out a wimpier. In the specs I noticed it is rated clear down to 2 ohms. This could be useful for pushing the second set of Advents I have sitting await for a re-cone job?? I was on about a 25yr Advent kick and have my Home theater set up with 6 of them with another half a dozen languishing. I'm thinking a shop system of epic proportion.

Ric:glasses2:

Power Amplifier Section:
Continous average power output at 8 ohms min RMS power per channel 20-20,000 kHz both channels driven,with no more than the rated distortion/ 90 W(19.5 dBW)
Distortion: 0.03%
Clipping Headroom: + 1.6 dB
Clipping Power(Maximum Power) 130 Watts at 8 ohms
160 Watts at 4 ohms
180 Watts at 2 ohms
Dynamic Headroom at 8 ohms - + 2.5 dB
Dynamic Power( short term) 160 Watts at 8 ohms
200 Watts at 4 ohms
200 Watts at 2 ohms
 
Someone explain please

Can someone clarify the 4 terms below for me and what they are selling with these specs?

thanks
Ric:glasses2:

Clipping Headroom: + 1.6 dB
Clipping Power(Maximum Power) 130 Watts at 8 ohms

Dynamic Headroom at 8 ohms - + 2.5 dB
Dynamic Power( short term) 160 Watts at 8 ohms
 
Ric27 said:
Can someone clarify the 4 terms below for me and what they are selling with these specs?

thanks
Ric:glasses2:

Clipping Headroom: + 1.6 dB
Clipping Power(Maximum Power) 130 Watts at 8 ohms

Dynamic Headroom at 8 ohms - + 2.5 dB
Dynamic Power( short term) 160 Watts at 8 ohms
Click to expand...


It looks like it is 3/4 of a Pio SX-1250. Somebody on here or AK ran 4 pairs of Advent's 2 channel off 1 stock 400 and managed to keep it at 8ohms. You could probably do the same thing with your receiver right?
 
Ric27 said:
Can someone clarify the 4 terms below for me and what they are selling with these specs?

thanks
Ric:glasses2:

Clipping Headroom: + 1.6 dB
Clipping Power(Maximum Power) 130 Watts at 8 ohms

Dynamic Headroom at 8 ohms - + 2.5 dB
Dynamic Power( short term) 160 Watts at 8 ohms
Click to expand...

I pulled this off the net.

"In digital and analog audio, headroom refers to the amount by which the signal-handling capabilities of an audio system exceed a designated level known as Permitted Maximum Level (PML). Headroom can be thought of as a safety zone allowing transient audio peaks to exceed the PML without damaging the system or the audio signal, e.g., via clipping. Standards bodies differ in their recommendations for PML."

That makes sense for the Clipping Headroom spec.

Another definition pulled from cyber space:

"Definition: Dynamic Headroom refers to the ability of a receiver or amplifier to output power at a significantly higher level than normal for short periods to accommodate musical peaks or extreme sound effects in films. This specification is important in home theater, where extreme changes in volume occur during the course of a film.

Dynamic Headroom is measured in Decibels. If a receiver/amplifier has the ability to double its power output for a brief period to accommodate the conditions described above, it would have a Dynamic Headroom of 3db."
 
Ohms Factor

Northwinds said:
It looks like it is 3/4 of a Pio SX-1250. Somebody on here or AK ran 4 pairs of Advent's 2 channel off 1 stock 400 and managed to keep it at 8ohms. You could probably do the same thing with your receiver right?
Click to expand...


Talking to a local HiFi guy about the Advent (LG) Ohms factor. He explained that they were actually rated @ close to 6 ohms and with two pair running together the load on one amp would be close to 3 ohms. Is it through some creative wiring that 8 advents could maintain a 8 ohms load? I am really just interested in running two pairs with out under loading the amp. I am hoping that the 7080 is going to be able to handle that. The specs list power to 2 ohms so is this an indication that the amp can hold up under a 2 ohms load. Maybe a dumb question but I have been looking for a amp for sometime to deal with this issue.

Ric:glasses1:
 
Last edited:
Ric27 said:
Talking to a local HiFi guy about the Advent (LG) Ohms factor. He explained that they were actually rated @ close to 6 ohms and with two pair running together the load on one amp would be close to 3 ohms. Is it through some creative wiring that 8 advents could maintain a 8 ohms load? I am really just interested in running two pairs with out under loading the amp. I am hoping that the 7080 is going to be able to handle that.

Ric:glasses1:
Click to expand...

Ric, he said something about a speaker switcher box he used and wired everything parallel or series? I am sure Lee remember the thread also. Might have been on AK. I will do a search and see if I can find it
 
"I used a combination of a Niles switch box with a impedance switch and series\parallel wiring to keep the impedance at 8 ohms or theoretically so according to my calculations.
scratch2.gif
They are happiest at an 8 ohm load"

"It is simple with 4 speakers per channel... wire in series parallel. wire both pairs in series for 16 ohms the then parallel the 16 ohm pairs for 8 ohms. Amps will run cool and the speakers will handle tons of power"

"Grateful is correct on how I wired it. The Niles switchbox was because I had 3 other sets of speakers wired that I would either run independently of the double stacked Advents or only one other pair with it. I could come up with different effects depending on which speakers were being used"
 
The 7080 is a genuine beast. It has a heavy transformer! You would not need a Niles type impedance box when driving double Advents. The 6 ohm dip is in the midrange and most amps can handle it.
The dynamic power ratings were a response to NAD, a competing brand carried by most Vector Research dealers.
 
Tennessee Connection

nakdoc said:
The 7080 is a genuine beast. It has a heavy transformer! You would not need a Niles type impedance box when driving double Advents. The 6 ohm dip is in the midrange and most amps can handle it.
The dynamic power ratings were a response to NAD, a competing brand carried by most Vector Research dealers.
Click to expand...

Nakdoc, Thanks for that info. Learning the complexities of ohms load over the frequency spectrum is about half a dozen notches above my pay grade. Fascinating really.

I see we are neighbors. I am in Brentwood. Do you have any tech services you recommend around here?

Ric:glasses2:
 
I own Hi Tech Service here in Nashville. We seem to be one of the only audio service centers in the state. Come by and visit!
 
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