Question for Mike Brown: Peavey EDI box

ajm · From: Los Angeles

I'm interested in this box and have several questions that are not clear to me from the information on the web site.

I presume that it goes between the amp output and speaker, and allows you to "tap" off a portion of the signal to route it to another source to eliminate micing the amp.

I'm planning to route it straight to the input of a recorder. I believe that the web site mentions some form of equalization inside of the EDI.

I'm concerned about how this will sound, as a lot of boxes of this type as well as power attenuators are made to feed the input of another amp/speaker set up with their "line out" outputs. When used the way that I want to use it they tend to have a lot of noise and/or distortion and/or high end. Do you have any experience with this device in the way that I'd like to use it?

I assume that the EDI is very similar to a Hughes and Kettner Red Box. If you are familar with this device and have any comments on their similarities/applications I'd be intersted in hearing them as well.

Thanks in advance for your response.

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Artie McEwan

HWHYoYo · From: West Sunbury, PA

While waiting for Mike to reply, I'll put in my 2 cents. The EDI does connect between the speaker output and the speaker. Plug in a lo z balanced cable and you're set to go. I've used EDI for many years on every amp I have, steel, lead, and bass. I prefer it rather than a mic, no unwanted noise picked up. Also no hum, hiss or any other undesirable sounds. EDI has a timbre control; I usually run it half way and have never had any problems. They seem to last forever. I believe there is a filter built in also. Not sure of the specs on that. Your turn, Mike.

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Wayne Hetzler
98 Carter SD10
00 Carter SD10
Evans FET500
Nashville 1000

Mike Brown · From: Meridian, Mississippi USA

To add to this, the EDI(Electronic Direct Interface)box is intended to be connected between the output of the amplifier and the input of the speaker(maximum 35 volts). A clockwise rotation of the "timbre" control gives a peak type of response in the upper mid-range. The "timbre" control helps in duplicating the practice of close miking your amp with a live microphone. The EDI has a 600 ohm transformer for routing the signal to a mixing console.

If you have further questions about this, contact me here at Peavey by calling 1-877-732-8391 and I'll be glad to assist. I do use one of these by the way.

Mike Brown
Peavey Electronics Corporation

Darvin Willhoite · From: Roxton, Tx. USA

Artie,
I have an extra EDI that I would sell if you're interested. I have one mounted in the back of my Peavey LA-400. It works great. Email me if you're interested.

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Darvin Willhoite
Riva Ridge Recording

ajm · From: Los Angeles

Thanks for your responses guys. I'm digesting all of the information right now.

Darvin: Thanks for the offer. I'll keep it in mind if I decide to go that route.

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Artie McEwan

Mike Brown · From: Meridian, Mississippi USA

You may also purchase a Peavey EDI box as well as other Peavey direct boxes through any authorized Peavey dealer. Here is a link to the EDI and also to our dealer locator;
http://www.peavey.com/products/shop_online/browse.cfm?action=final&wc=3A30&fam=3&tcode=30
http://www.peavey.com/support/dealerlocator/

Mike Brown
Peavey Electronics Corporation

George Macdonald · From: Vancouver Island BC Canada

Does the "Output Jack" on the back of the Nash. 1000 do the same thing as the EDI box?

Mike Brown · From: Meridian, Mississippi USA

Yes, but without the TIMBRE adjustment, but you should be able to duplicate that with the EQ contols on the front panel.

Keith Murrow · From: Wichita, KS

Mike Brown · From: Meridian, Mississippi USA

P x R squared.

Jack Stoner · From: Kansas City, MO

Using the Nashville 1000 specs printed on the back of the chassis.
300 watts, 34.6v, 4 ohms.

P=E squared divided by R - 1197.16 divided by 4 equals 299.29

E= P divided by (RX2) or 299.29 divided by 8 (4 X 2) equals 34.41 V (an approximate equasion).

R Squared in this case (4 ohms) would be 16.

Keith Murrow · From: Wichita, KS

Sorry guys, I appreciate your responses, but you're way over my head.

Let's put it this way...will a 100 watt guitar amp, or a 300 watt bass amp, (at 4 ohms) blow the EDI? Maybe this is just one of those questions that has too many variables to have a simple answer.

Jack Stoner · From: Kansas City, MO

It depends on the maximum output voltage. The EDI is rated for 35 volts. In all likelyhood it will handle your amps but the only way to know for sure is to have the output (maximum) voltage specs of the amps.

Dave Mudgett · From: Central Pennsylvania and Gallatin, Tennessee

I think the equation should read

E = square-root(P*R), not P*R squared.

E is the RMS voltage in Volts
P is the RMS power in Watts
R is the load impedance in Ohms

Again, applying the NV 1000 power and speaker impedance specs Jack gave above, P=300 Watts and R=4 Ohms, then one can compute the max generated voltage as

E = square-root(300*4) = square-root(1200) = 34.6 Volts, approximately.

That's pretty close to 35 Volts. So, it looks like 300 Watts is the nominal design maximum power for this box into a 4-Ohm speaker.

To go the other way and figure out the nominal design maximum power for an given speaker impedance, given the voltage limit and speaker impedance, use the power equation

P = (E^2)/R, where E^2 is E squared.

To apply this to an 4-ohm speaker,

Pmax = (35^2)/8 = 1225/4 = 306 Watts, approximately. This is nominally 300 Watts.

To apply this to an 8-ohm speaker,

Pmax = (35^2)/8 = 1225/8 = 153 Watts, approximately, nominally 150 Watts.

In other words, running at 8 Ohms, the voltage limit implies one half the 4-Ohm power limit. I looked at the Nashville 1000 power specs at 8 Ohms, which read 190 Watts. Therefore, I argue this could push the voltage over the nominal design maximum of 35 Volts at 8 Ohms. But there shouldn't be any problem with a 100 Watt amp at 8 Ohms.

These are all nominal values, and these equations imply that the speaker load is mostly resistance. If that is not the case and there is a lot of capacitive or inductive impedance, then the voltage and current can be out-of-phase, and one can get higher voltage swings at the same RMS power. But I'll bet the Peavey engineers have already considered this in their design limits.

I think the bottom line here is that, roughly speaking, at 4 Ohms, the approximate RMS power limit is roughly 300 Watts, and at 8 Ohms, it's roughly 150 Watts. I usually build in a "margin of safety", and I probably wouldn't try more than 100-130 Watts at 8 Ohms or 200-250 Watts at 4 Ohms. But, again, Peavey may well have overdesigned this - I just don't like to push it.

[This message was edited by Dave Mudgett on 15 December 2005 at 06:41 PM.]

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