Amp -what size what specs?

[DJPhatman]

He could run series/parallel for 4 Jacks = 8Ohms

He'd need a pretty beefy amp to run enough watts / volts into four series/parallel 2510s @ 8 ohms, because the series circuit splits the voltage. OTOH, running four in parallel off one side of an amp (2 ohms) isn't the greatest idea, either, especially if it's being pushed pretty hard.

8 Ohm bridge.

[Mikey]

He could run series/parallel for 4 Jacks = 8Ohms

need a pretty beefy amp to run enough watts / volts into four series/parallel 2510s @ 8 ohms, because the series circuit splits the voltage. OTOH, running four in parallel off one side of an amp (2 ohms) isn't the greatest idea, either, especially if it's being pushed pretty hard.

8 Ohm bridge.

This particular dicussion came from this posting by the OP ...

Separate scenario that i need to know what do i need to have.Each scenario is independent of the others.
1-To power one jack10 w/ delta 2510s and 12 array tweets>what amp do i need to run this?
2-To power 4x jacks10 (same as above) >on ONE CHANEL what amp do I need?
3-To power 4x jacks10(same as above)> two per Chanel what amp needed?

Since bridging uses both amp channels, it's not a solution for #2 (in bold).

[u4david]

Separate scenario that i need to know what do i need to have.Each scenario is independent of the others.
1-To power one jack10 w/ delta 2510s and 12 array tweets>what amp do i need to run this?
2-To power 4x jacks10 (same as above) >on ONE CHANEL + 2 8" monitors on other what amp do I need?
3-To power 4x jacks10(same as above)> two per Chanel what amp needed?

Could any one assign/recommend a amp that will do each scenario? not too over powered not to weak.Just for me to see what is that each scenario require.

Not necessary one have to do all.More like individual I deal amp for each scenario.

[DJPhatman]

Separate scenario that i need to know what do i need to have.Each scenario is independent of the others.
1-To power one jack10 w/ delta 2510s and 12 array tweets>what amp do i need to run this?
2-To power 4x jacks10 (same as above) >on ONE CHANEL + 2 8" monitors on other what amp do I need?
3-To power 4x jacks10(same as above)> two per Chanel what amp needed?

Could any one assign/recommend a amp that will do each scenario? not too over powered not to weak.Just for me to see what is that each scenario require.

Not necessary one have to do all.More like individual I deal amp for each scenario.

1-Any quality amp that will output 250 Watts @ 8 Ohms. Behringer EP2000/4000 is fine. Peavey IPR1600 is fine, also.
2-Not recommended, as running @ 2 Ohms puts a real strain on the amp. I won't recommend an amp because I won't run like this, except in an emergency.
3-See answer to 1.

[Harley]

He could run series/parallel for 4 Jacks = 8Ohms

He'd need a pretty beefy amp to run enough watts / volts into four series/parallel 2510s @ 8 ohms,..

Which proves there's no such thing as a free lunch when it comes to creating decent sound. A 125cc motorbike isn't going to tow an 8 x 4 furniture trailer all that well.

[Mikey]

He could run series/parallel for 4 Jacks = 8Ohms

He'd need a pretty beefy amp to run enough watts / volts into four series/parallel 2510s @ 8 ohms,..

Which proves there's no such thing as a free lunch when it comes to creating decent sound. A 125cc motorbike isn't going to tow an 8 x 4 furniture trailer all that well.

You said it, brother. Too many people want to stretch and push their gear to the limits, then they complain when their gear takes a shit.

Other guys ... before suggesting a piece of gear, at least read-up on it a bit first. That Peavey IPR 1600 has had a lot of bad reviews. It has serious overheating issues.

[Gregory East]

If you reeeeealllllllly want to put put four on 1 channel it had better be a reeeeaaall amp that can do 2 ohms or else push 600W into 8 ohms. iirc 2510's are ok with 250W but 150W would still make a lot of noise.

a +1 would have sufficed fellas.

[Mikey]

If you reeeeealllllllly want to put put four on 1 channel it had better be a reeeeaaall amp that can do 2 ohms or else push 600W into 8 ohms. iirc 2510's are ok with 250W but 150W would still make a lot of noise.

a +1 would have sufficed fellas.

Welll ... in this case, not really. The OP doesn't have much pro audio knowledge, so driving home the importance of not overdriving gear is an issue that can't be stressed enough.

And ... just to drive it home some more, here's an old quote that I saved from Moo that pretty well sums things up ...

I came across this Info on another site recently:

Years ago I did a M_ean T_ime B_efore F_ailure (MTBF) on an amplifier that claimed to double its power going from 8 to 4 and again from 4 to 2 ohms (it did). Based on the junction temperatures of the transistors the MTBF at 8 ohms was 10,000 hours, at 4 ohms it was 625 hours, and at 2 ohms it was 39 hours.

MTBF is such that even though the amp won't blow up today or tomorrow, the life is shortened. How much? A typical amp will have a MTBF about 16X longer at 4 ohms vs 2 ohms. The big PA companies in the states will run 2 ohms in the mids and highs, but run 4 ohms in the low end. There is a reason for that.

This makes thing much clearer regarding running amps at 2 ohms. It is clear that not all amps are equal, and that some will take punishment more than others, and that more expensive and heavier built amps will have a longer life-span. If you run the amp at 4 ohms and keep it out of the Red it should last for years. - At 2 ohms near its limits - it will last for days.

[Drey Chennells]

well said. the principle of overbuilding and detuning a system (audio and auto for that matter) in general is sound and largely undervalued imho..

[u4david]

the reason I'm asking the question is to get well scaled answers.Do not have need to under power anything if I get recommendations.

So if you can drop some model numbers and names of recommended equipment for each scenario that would be good.
I will check in the recommended Behringer. Any other?

[Gauss]

As they say, "Give a man a fish, and he eats for a day; teach a man to fish, and he eats for life."

If I were looking for an amp, here's how I would do it.
First, I'd find the wattage I needed. For me, It was 275 watts at 8 ohms.

Second, I'd go to a online retailer and browse the amps, comparing the models that met that criteria. For example, Musiciansfriend.com has a wide selection, or northernsound.net has great deals and reliable gear.

After I find the models that will work, I check the reviews on here for mention of that amp, or on other web sites.



Is anyone else doing something different than this to find amps to recommend?

[Radian]

How about by using gain in terms of dB?

For example at typical bar venue:

If I want / need 110 dB max (enough to get your clothing moving with bass frequencies) at the listening position using a sine wave (worst case scenario), I work back to the cabs adding 6 dB for every doubling of distance out from the cabs in meters. For 6 meters (the far side of a dance floor for instance) , this is +16 dB (rounding up) for a total of 126 dB at the source. Subtract the average sensitivity of the cab(s). Using 2 standard T48's just above Fc ~103 dB equates to 23 dB of required gain. 23 dB of gain is at least 200 watts into 4 ohms (28V).

This could be considered conservative, because it doesn't account for any additional loading from any room structure, doesn't take into account when the sub is actually "on the horn", and finally 110 is pretty F***'n loud. It also assures you of obtaining a specific SPL, as opposed to hoping if things will be loud enough. There are many other variables I'm not taking into account here of course, for sake of brevity. It is just another way of working the issue from a different perspective, like when you have to work with rental gear or are stepping into someone else's setup.

My $.02

[CafSentryGnome]

As they say, "Give a man a fish, and he eats for a day; teach a man to fish, and he ...."

sits in a boat all day and drinks beer

[u4david]

definitely would like to know how chose my own amp yes.

I get from speaker the RMS value?
Or should i use the program or the peak?

Then add all driver values together and all the tweets and other el. components= wattage= get amp with that wattage?

[Tom Smit]

So how do you exactly match amp wattage and ohms to certain speaker or combination of speakers?
Do you go for the total of RMS total of peak or total of program wattage and get amp that have the wattage rating equal or higher ??
And when resistance changes lets say from 8 to 4 does the power requirements change?
Thank you.

Simplest thing to do is determine the RMS (PE) rating (not peak) of a given woofer driver and match your amp to that.

For example - for a pair of DLII2510 loaded Jack 10, you'll want an amp capable of up to 250W RMS @ 8 ohms per channel. Fortunately most, even the cheapest, power amps are capable of this output.

This was posted earlier in this thread....please ponder it...let it sink in.