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Author Topic: Any experience with the Electrovoice tour-x speakers?  (Read 19316 times)

Banibal Yonadam

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Any experience with the Electrovoice tour-x speakers?
« on: December 26, 2010, 08:19:16 pm »

HI

Would like to hear from someone about the Ev tx1152. Has anyone used them or had experience with them?
The specs for the speakers say that you can use one amplifier (2x550w in 8 ohm and 2x900w in 4 ohm) to run  a pair of Ev tx1152 tops and a pair of Ev tx1181 subs. The weird thing about that is that the specs also say that these speakers have a minimum impedance of 5,4 ohms. But won't connecting the speakers in parallell to one amplifier make them go down to 4 ohms or am I missing something?

H/

Banibal
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Tom Young

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Re: Any experience with the Electrovoice tour-x speakers?
« Reply #1 on: December 27, 2010, 07:10:13 pm »

The short answer is that almost all professional power amplifiers can handle the load presented by (2) of the these drivers wired in parallel.

Longer answer:
When we speak of 4, 8 and 16 ohm speakers and drivers these are "nominal" values. I have never (until now, see below) seen a clear definition of what "nominal impedance" means. In practice we basically assume that this means an average impedance or the impedance at 1kHz.

But the impedance of a speaker driver varies with frequency and in this case EV has provided a minimum impedance of 5.4 ohms for the driver. This is perhaps worth noting but there is not enough information provided with this to "raise a red flag". Two of these drivers in parallel will yield a combined 'minimum' impedance of 2.7 ohms. Chances are quite good that this will not be a problem (again) with a modern day professional amplifier.

Note: I just discoverd that wikipedia has a detailed explanation of speaker impedance and includes a defintion of (and mathematical formula for determining) "nominal" impedance. Because wikipedia is not peer-reviewed and there are no cited references, I am holding off from endorsing this until I research it more.
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Tom Young, Church Sound section moderator
Electroacoustic Design Services
Oxford CT
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Ivan Beaver

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Re: Any experience with the Electrovoice tour-x speakers?
« Reply #2 on: December 27, 2010, 10:39:37 pm »

Nominal impedance is one of those things that different people have all different kinds of descriptions for.

Anything that is not 4-8-16 ohms confuses many users.

We have a loudspeaker that we origionally rated as 6 ohm nominal.  I got all kinds of phone calls asking what size amp to use becuase they could not find a 6 ohm output spec.  

Even though we gave a minumum and a showed an impedance graph, it remained a "mystery".

When we changed the rating to 4 ohms, those phone calls stopped.  It was easier for people to understand. Rolling Eyes even though nothing changed with teh actual loudspeaker.

The average impedance was closer to 8 ohms.  So where do you rate it?  We went for the next lowest number, just to be on the safe side.

And if you try to rate the sensitivity on power-what impedance would you use? the rating?  Which one.  Hence the reason for sensitivity based on voltage-let the user figure out what impedance they feel should be used.

Impedance is just another one of those things that "seems" simple, but really has a lot of different ways in which it could be read.  A simple number with a complicated meaning.

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Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.

Banibal Yonadam

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Re: Any experience with the Electrovoice tour-x speakers?
« Reply #3 on: December 28, 2010, 04:01:31 am »

OK thanks. Things are starting to get a little clearer now on how the minimum impedance of these speakers matters.

Tom wrote that a modern day professional amplifier will probably not have any problems with a minimum load of 2,7 ohms (when parallell). I think I already know the answer to this, but just to be sure, is the QSC plx1804 considered one of those amplifiers that should be able to handle the parallel wiring i was talking about? The specs of the amp say that it can go down to 4 ohms but they add that it is stable in low impedance situations.

Another question I have is if the EV tx-1152 speakers are any good?? I know that this is a very general question but I want to know what kind of thoughts you have, the
guys that have tried the speakers out.

H/
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Banibal Yonadam

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Re: Any experience with the Electrovoice tour-x speakers?
« Reply #4 on: December 28, 2010, 03:59:55 am »

OK thanks. Things are starting to get a little clearer now on how the minimum impedance of these speakers matters.

Tom wrote that a modern day professional amplifier will probably not have any problems with a minimum load of 2,7 ohms (when parallell). I think I already know the answer to this, but just to be sure, is the QSC plx1804 considered one of those amplifiers that should be able to handle the parallel wiring i was talking about? The specs of the amp say that it can go down to 4 ohms but they add that it is stable in low impedance situations.

Another question I have is if the EV tx-1152 speakers are any good?? I know that this is a very general question but I want to know what kind of thoughts you have, the
guys that have tried the speakers out.

H/
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Tom Young

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Re: Any experience with the Electrovoice tour-x speakers?
« Reply #5 on: December 28, 2010, 06:46:28 am »

Quote:

.... is the QSC plx1804 considered one of those amplifiers that should be able to handle the parallel wiring i was talking about? The specs of the amp say that it can go down to 4 ohms but they add that it is stable in low impedance situations.


Looking at the impedance curve that EV provides and knowing you will use a subwoofer below the TX115's...... my experience says this will work.

But in reality this is the sort of question which is best answered by the amplifier manufacturer. QSC has very good tech support (not to mention the quality of their products) and you can simply email them the info and question that you have and they will provide an answer.

Quote:

Another question I have is if the EV tx-1152 speakers are any good?? I know that this is a very general question but I want to know what kind of thoughts you have, the
guys that have tried the speakers out.


I'm not comnenting as I have not used this particular series of speakers. I have used a good number of EV speakers and have been very pleased with the ones I evaluated and then chose for various projects and designs.

One last word of advice. No matter which speakers you decide on, they need to be measured and optimized once they have been installed. The interaction between the speakers, between the speakers and the room *and* between the speakers and the microphones will result in very different behavior (specifically frequency response) than what you see on a spec sheet. This is one of the biggest mistakes that churches and other not very well experienced users make. You need to hire someone (who has the qualifications) to come in and conduct this service.
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Tom Young, Church Sound section moderator
Electroacoustic Design Services
Oxford CT
Tel: 203.888.6217
Email: dbspl@earthlink.net
www.dbspl.com

Banibal Yonadam

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Re: Any experience with the Electrovoice tour-x speakers?
« Reply #6 on: December 28, 2010, 09:32:31 am »

That sounds good. Thanks for the info and the advice. We're a pretty small church now working off a lightweight soundrigg, which is performing well enough for us for the moment. But you never know when we would need to expand, so I'm trying to gather as much useful info that I can.

I find this forum space extremely useful!

Thanks
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Tom Young

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Re: Any experience with the Electrovoice tour-x speakers?
« Reply #7 on: December 28, 2010, 09:45:10 am »

Always glad to help.
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Tom Young, Church Sound section moderator
Electroacoustic Design Services
Oxford CT
Tel: 203.888.6217
Email: dbspl@earthlink.net
www.dbspl.com
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