EV QRX 115/75 Review

Review of the EV QRX 115/75 full range PA speakers.

400w program
1600w peak
8 ohms
passive and biamp options

Category:

Music

Tags:

• EV
• qrx
• 115/75
• dj
• speakers
• bass
• 15
• inch
• compression
• driver
• pro
• audio
• mobile
• tour
• monitor
• watts
• 400
• 1600
• ohms
• full
• range
• PA
• flyable
• fly
• electrovoice
• electro
• voice

[waylan3]

so did big dawg by those from you

[crazydevon007]

no I was just reviewing them for him. I still have them.

[papadopilo]

I have wondered what is the difference between 4 ohm and 8 ohm. They have told me that 4 ohm are more for pop group, because 8 ohm speakers are fore for hi fi entusiast because the sound will be better diferensiert and clearer.

[crazydevon007]

The ohm rating has nothing to do with the sound of the speaker. It is simply the measurement of resistance. Most commercial speakers will be 8 ohms as a standard so that they can be daisy chained. This makes it easier to set up large speaker systems for concerts, but it has no effect on the sound of the speaker itself.

[DankVapours]

To sum up,

The power rating and impedance of a speaker (EG 600 @ 8 ohms) needs to be DIRECTLY matched with that of the amp. So for the 600 watt speakers at 8 ohms. You need an amp that is 600 @ 8 ohms. An amp that is 600 at a lower impedance WILL UNDER POWER.

For of showing an example, an amp that is 1000 watts at 2 ohms a channel will ROUGHLY be 500 ish at 4 and around 300 or less at 8 ohms.

Having said that, I run a Crown XTI 1000 which is 275 @ 8ohms on speakers of 600 @ 8 ohm. It runs fine!

[crazydevon007]

Correct. Once you start looking at live sound rigs for concerts though or larger playback systems for clubs you'll want an amp that could over power your speakers. The reason for this is so it can swing enough voltage to hit transients and have enough power after wards to continue pumping the music at a consistent volume. A system like that I would usually go with 1.5x my speakers max wattage rating and run it with a limiter to prevent damaging the speakers.

[TheLASERJAW]

Nice trapezoids. I love Electro Voice.

[funkfactor1]

dont really see the point of this, may as well just read the manual. this guy was obviously just reading the specs off a webpage or the manual, would have been nice to hear them maybe?

[AVOLITESjockey29]

@MartinGod3992 you are wrong dude.. impedance is used in terms of electrical(AC) and resistance is use in terms of DC. they are the same actually,

[richg101b]

love the qrx range. my fave is the 12" version of this. amazing speakers

[FreezEntertainment]

those are some nice ass speakers, especially when you knocked on them haha

solid.

[320bit]

@MartinGod3992 How so? Please explain this to me. I would be interested to know.

[MartinGod3992]

yes it is but, impedance is completely different from resistance

[320bit]

@crazydevon007 Well, I cant say as I know much about 110v amplifiers, but in the 12v world I live in, sound quality does diminish going from 8 to 4 ohm or in my case usually 4 to 1 ohm. But I suppose going from 4 to 1 ohm would be more audible than going from 8 to 4.

[320bit]

@MartinGod3992 Or I guess a better way for me to put that is ohm is a measurement of electrical resistance/impedance.

[320bit]

@MartinGod3992 ohm measures electrical resistance....