BillFitzmaurice.info

Hey,

I'm figuring this amp should put out right at 40 V max. The 3012LF's in my Tubas will take 50 V, but I wasn't planning to run much past 40 V anyway. Any problem with that logic?...comments? Just not sure how headroom fits into this picture.

http://www.behringer.com/EN/Products/EPQ900.aspx

If you put one per side, you get 44 volts each. If you put them both on one channel, you get 39 volts.

I've kept an eye on those for quite a while, as it looked like a nice addition to a compact bass guitar rig. But it's been a year since they were first announced (as EPQ1000 initially), they were "coming soon" all the time and are still not available. At least not where I live (continental Europe). I've given up on this model. Is it actually available now or just listed in web shops?

There is a forum member using EPQ1200 or EPQ2000, which are 2u height as opposed to 1u for the 900. IIRC he was quite happy with the amp.

Bruce Weldy wrote:If you put one per side, you get 44 volts each. If you put them both on one channel, you get 39 volts.

Right now I'd run one 3012LF per side, so that would be fine, then when I'm able to build two more T30's, I'd be running 4 ohms per side, again at 39. From hearing my two in the 25-30 v range, I'm thinking that would be fine. I certainly like the idea of the weight and size and lack of all the DSP on lots of amps now. If for some reason I didn't like it on subs I could always move it to tops, but it seems lik it would be OK.

I quote:

"It takes huge pulses of energy (current and voltage) to propel a woofer cone out fast enough to match a bass beat. That’s called Transient Response and it’s the holy grail of amp designers. By carefully selecting transistors with extremely high slew rates and optimizing other proprietary parts of our circuitry, our amps are able to react instantly to even the most demanding electronic bass impulses. If the woofers in your PA system can keep up, your audience will hear a tighter, crisper, more natural sound"

Chris_Allen wrote:I quote:

"It takes huge pulses of energy (current and voltage) to propel a woofer cone out fast enough to match a bass beat. That’s called Transient Response and it’s the holy grail of amp designers. By carefully selecting transistors with extremely high slew rates and optimizing other proprietary parts of our circuitry, our amps are able to react instantly to even the most demanding electronic bass impulses. If the woofers in your PA system can keep up, your audience will hear a tighter, crisper, more natural sound"

and...am I missing something?...

Since you already have the tubas and already have an amp that can put out more voltage that the one you're considering, just run simple tests to see if you will be ok with the power they put out.

However, do consider that while the max an amp can put out, music material is not pure sine waves and the average volts will be much lower. For example, take my amps which one of them can do 42volts all day, but even like this, I do not like it on my bp102's and really only use it for my jacks. It can do 20votls on average with peaks and after that, it begins clipping.

doncolga wrote:

Chris_Allen wrote:I quote:

"It takes huge pulses of energy (current and voltage) to propel a woofer cone out fast enough to match a bass beat. That’s called Transient Response and it’s the holy grail of amp designers. By carefully selecting transistors with extremely high slew rates and optimizing other proprietary parts of our circuitry, our amps are able to react instantly to even the most demanding electronic bass impulses. If the woofers in your PA system can keep up, your audience will hear a tighter, crisper, more natural sound"

and...am I missing something?...

I don't know... It's marketing-speak on the Behringer EPQ web pages.

I'm surprised that the EPQ900 does have RCA inputs like the EPQ1200.

doncolga wrote:

Chris_Allen wrote:I quote:

"It takes huge pulses of energy (current and voltage) to propel a woofer cone out fast enough to match a bass beat. That’s called Transient Response and it’s the holy grail of amp designers. By carefully selecting transistors with extremely high slew rates and optimizing other proprietary parts of our circuitry, our amps are able to react instantly to even the most demanding electronic bass impulses. If the woofers in your PA system can keep up, your audience will hear a tighter, crisper, more natural sound"

and...am I missing something?...

Transient response is meaningless where subs are concerned. What counts is the stiffness of the power supply, and that's where inexpensive lightweight amps tend to fall short. At the lower end of the pricing scale heavy iron still works best for subs.