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#1

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Posted 22 January 2014 - 12:22 PM

Hi there,

My old speaker setup (5.1 computer speakers) was getting old and making lots of loud buzzing noises so I decided it was time to upgrade. I thought I'd keep it cheap and get something second hand when it came up, I found something I quite liked and had the only requirement I wanted (digital input) so I bought a Sherwood - VR-758R amplifier. So now its time to buy some speakers, from what I found on the net the amp can handle 8 ohms (Rated at 80 Watts RMS, 20 Hz-20kHz with no more than 0.09% THD into 8 ohms). However, I have found a nice looking set of speakers that are 6 ohms. My question is should I wait for 8ohms speakers or will 6 ohms be more than enough. Also I have the feeling I might be looking at this whole thing the wrong way.

Any help is appreciated.

Thanks!

#2

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Posted 22 January 2014 - 04:22 PM

Lower impedance speakers need more current and/or less voltage, and therefore mean the output transistors in the amp have to dissipate more power. And there will be other effects too, but much less important (for instance it'll change the THD, and not necessarily for the better). So I would say keep looking unless you want to risk your amp.
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#3

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Posted 22 January 2014 - 05:05 PM

i have been looking into this also as i have 6ohm speakers and 8ohm amp

you should get 8ohm speakers due to the wattage of your amp.

Depending on how good the amp is, the speakers could draw out more power than the amp can handle forcing it to overheat and shutdown, make sure there is alot of air circulation and dont have it loud for long periods of time.

you can help it by using a powered amp to handle the low frequency

modern high end amps can cope with this, i have been checking how warm mine is

what speakers did you have in mind?
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#4

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Posted 22 January 2014 - 09:31 PM

http://www.trademe.c...px?id=688003177

these are the speakers. (if im not allowed to post trademe links im sorry - delete this.
I dont need crazy amounts of power I just want a decent 5.1 system to work with my computer.

P.S thank you for all your advice and input

#5

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Posted 22 January 2014 - 10:39 PM

would need to find the model number to get more information about the speakers, the sub may be passive so it wont work, the main speakers and center might be too powerful, but your looking at 120$ plus for active sub, so there is really no cheap option,
nice speakers for 25$,

you should see how warm the air gets where the cooling fan is.

http://www.manualsli...ood-Vr-758.html

#6

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Posted 22 January 2014 - 11:35 PM

The manual said i'll be needing an active sub, which I conveniently have! Nothing fancy but I assume since its powering itself that I don't have to worry about it working with the amp. I have been doing some reading and if the speakers are not too powerful then I might go for them.

#7

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Posted 23 January 2014 - 09:42 AM

As you've got an active sub you don't need to worry about that part.

If you run the amp at no more than 3/4 of its output power then you should be fine with the lower impedance speakers, from the perspective of the power dissipated by the output transistors. But that still doesn't say anything about the THD when putting 60 W into 6 ohm.

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i5 7400, Gigabyte GA-B250M-D3H, 16 GB DDR4, integrated graphics, Adata XPG SX8200 480 GB (NVMe), 3x Kingston SSDNow KC380 120 GB, Corsair MX100 128 GB, Spinpoint F3 1TB HDD, DVD writer, all inside a wood case I built, Dell U2412M 24", U2311H 23" IPS and Philips 150B4 15" monitors, wood-bodied mouse, Dvorak keyboard, openSUSE Tumbleweed, Windows 8.1 Pro in a VB VM inside Linux

I may occasionally give advice regarding (consumer) law, but it is only my opinion based on my reading – I am not a lawyer.

Romans 3:23; 6:23; 5:8; 10:9-10,13


#8

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Posted 23 January 2014 - 11:34 AM

dont have it too loud, and dont use bass boost or similar equalizers, the active sub should have connections for the left and right speaker to filter the sound under 150hz,
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#9

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Posted 23 January 2014 - 10:25 PM

The speakers I posted earlier are 80w. So would that be too much for my amp even if I am running only 5 speakers no sub? Sorry to bug you guys so much, both your inputs is much appreciated.

#10

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Posted 24 January 2014 - 08:32 AM

No, the speaker wattage won't affect anything. But if you turn the volume up too far with 50 W speakers you'd probably blow the speakers before the amp, whereas with more powerful ones it might be the other way around (it depends on what the amp can actually handle vs. what it is rated for). Whereas with 8 ohm speakers of ≥80 W you shouldn't be able to blow either.
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i5 7400, Gigabyte GA-B250M-D3H, 16 GB DDR4, integrated graphics, Adata XPG SX8200 480 GB (NVMe), 3x Kingston SSDNow KC380 120 GB, Corsair MX100 128 GB, Spinpoint F3 1TB HDD, DVD writer, all inside a wood case I built, Dell U2412M 24", U2311H 23" IPS and Philips 150B4 15" monitors, wood-bodied mouse, Dvorak keyboard, openSUSE Tumbleweed, Windows 8.1 Pro in a VB VM inside Linux

I may occasionally give advice regarding (consumer) law, but it is only my opinion based on my reading – I am not a lawyer.

Romans 3:23; 6:23; 5:8; 10:9-10,13


#11

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Posted 27 January 2014 - 03:03 PM

I just bought a set of 5 8 ohm speakers at 50w peak 100w. Was tempted to get the 6 ohm ones for a while but didn't want to ruin anything! Thank you both so much for your help and advice.
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#12

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Posted 27 January 2014 - 08:25 PM

We're glad to help whenever anyone needs it!

Recommended Power Supplies Recommended review sites Why stores shouldn't be removed RAM voltage

i5 7400, Gigabyte GA-B250M-D3H, 16 GB DDR4, integrated graphics, Adata XPG SX8200 480 GB (NVMe), 3x Kingston SSDNow KC380 120 GB, Corsair MX100 128 GB, Spinpoint F3 1TB HDD, DVD writer, all inside a wood case I built, Dell U2412M 24", U2311H 23" IPS and Philips 150B4 15" monitors, wood-bodied mouse, Dvorak keyboard, openSUSE Tumbleweed, Windows 8.1 Pro in a VB VM inside Linux

I may occasionally give advice regarding (consumer) law, but it is only my opinion based on my reading – I am not a lawyer.

Romans 3:23; 6:23; 5:8; 10:9-10,13





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