Amp and Speakers - Ohm query

clio_16v

I have an Optonica SM-3636 amp


and JPW Sonata Bookshelf speakers rated at 8 ohm 70 watt 87db.

I'm unsure whether the amp will match the speakers ok? The amp is 2 x 65 watt @ 4 ohms. The speakers are 70 watt @ 8 ohms.

andy1249

What you see in that picture is the amps rating at 4 ohms impedance , the amp itself will take speakers 4 ohms and above but the power rating at the higher impedance levels will be lower.

Electrically the speakers you have in mind will work fine with the amp.

Mathiasb

No problems. Your speakers can take more juice (power-wise, it doesn't say anything about excursion) than your amplifier can provide, so you're ok.

Ricky-Ricardo

The amp should drive the speakers well. Basically when a speaker has twice the impedance of that rated on the amp it means roughly half the wattage gets through so it will be 35+ watts at 8 ohms. With a speaker of 87 dB sensitivity that should be plenty of power to go loud in an averagely sized room. Some amps are quoted at 4 ohms to big up the power rating, thats all. Interesting amp BTW - looks like a 70's design. The JPW speakers should sound good.

justcallmemoses

I have two speakers at 1000 watts program
(500 watt rms @8 ohm each side)

Would the following spec power amp match the speakers??


Power Amp Specifications:
4Ω stereo: 2 x 500Wrms
8Ω stereo: 2 x 250Wrms
8Ω bridged: 1 x 800Wrms
Max power: 1600Wmax @ 8Ω

Mathiasb

justcallmemoses wrote: »

I have two speakers at 1000 watts program
(500 watt rms @8 ohm each side)

Would the following spec power amp match the speakers??


Power Amp Specifications:
4Ω stereo: 2 x 500Wrms
8Ω stereo: 2 x 250Wrms
8Ω bridged: 1 x 800Wrms
Max power: 1600Wmax @ 8Ω

500W RMS @ 8ohm? Wow, those speakers take a lot of heat. What's the make/model?

The amp will work fine (use in 8 ohm stereo), but if it sounds bad when you turn it up, turn the volume down or you might damage the speakers (amp delivering distorted signal to the speakers can fry the voice coils).

justcallmemoses

Mathiasb wrote: »

500W RMS @ 8ohm? Wow, those speakers take a lot of heat. What's the make/model?

The amp will work fine (use in 8 ohm stereo), but if it sounds bad when you turn it up, turn the volume down or you might damage the speakers (amp delivering distorted signal to the speakers can fry the voice coils).

peavey ul 15 (black widow version)

Mathiasb

justcallmemoses wrote: »

peavey ul 15 (black widow version)

OK that's loud.

justcallmemoses

Mathiasb wrote: »

OK that's loud.

Cheers! thanks for the info.

is 250 watts a side enough for pub gig? acoustic, vocal and electric miced

Mathiasb

justcallmemoses wrote: »

Cheers! thanks for the info.

is 250 watts a side enough for pub gig? acoustic, vocal and electric miced

No idea. Lots of factors to think about. I say, move the gear over before they open, plug it in, play some stuff from your phone and decide if it's loud enough!