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Old 14th February 2009, 08:16 AM   #1
jamikl is offline jamikl  Australia
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Default Amps for active crossover setup

I need four to six amps for the above set. I have seen a Yamaha home theatre amp with the required number secondhand. 85 Watts Rms at 0.04% distortion with all channels operating for A$295.00. the other option is chip amps. At this point in time I would prefer not to spend too much on amps and put my money into better speakers. What does anyone think fo the Yamaha option. I know I would have to alter the internals and 6 inputs direct to the power amps and leave all the rest of this receiver disconnected.
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Old 14th February 2009, 10:18 AM   #2
Rudolf is offline Rudolf  Germany
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Default Re: Amps for active crossover setup

Quote:
Originally posted by jamikl
What does anyone think fo the Yamaha option. I know I would have to alter the internals and 6 inputs direct to the power amps and leave all the rest of this receiver disconnected.
There is a large number of secondhand 7.1 AV receivers with six multichannel inputs (for DVD players with integrated decoder). If you buy one of them there is absolutely no need to alter any internals. Volume control will work for all channels too. Mine is an Onkyo TX-SR505. I donīt see how I could have built six power amps of the same quality for the money I payed for that receiver.

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Old 15th February 2009, 01:48 AM   #3
jamikl is offline jamikl  Australia
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Thanks for the reply Rudolf. The Yamaha I looked at and which gave me the idea was a receiver. I did not notice that it might have six inputs. I,ll have to have another look at it. Several dealers told me that Onkyo and Yamaha were the better units to look for.
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Old 15th February 2009, 10:59 AM   #4
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Most receivers with 5.1 or 7.1 inputs won't have an amp for the .1 channel so you have either 5 or 7 amplifiers. Using a receiver with 5.1/7.1 inputs for this application is a good idea since it puts the volume control after the crossover, attenuating any noise generated there.

The amps in my Yamaha DSP-A1 sound a bit fuzzy with good tweeters. Not annoying, but definitely noticeable when compared to a my Leach or A-75.

You've found an inexpensive way to get started in active crossovers. With good low distortion drivers you will be more likely to notice an amp's character. Not to discourage you, just pointing out that you'll probably want to upgrade before long.

I've heard good things about the Emotiva line, but haven't heard them myself. They have a 5 channel amp for a bit more than double the receiver you are considering.
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Old 15th February 2009, 11:21 AM   #5
AndrewT is offline AndrewT  Scotland
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the Yamaha, or any cheap multi-channel amplifier, is likely to be the weakest link in any good surround sound system.
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Old 15th February 2009, 01:46 PM   #6
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There seems to be a bit of confusion about the number of channels available.

5 channels would be OK, you could have 2 tweeters, 2 midrange and one bass. (without arguing too much about woofer/subwoofer definitions).

Thought 1 here is that you probably need more power in the bass than in the treble, so 5 (or even 6) equally-powered channels is not ideal. That said, 85W will still provide some bass, particularly if too much extension is not sought.

The other complication is how you are going to derive your bass signal. If you have 2 channels and split them 3 ways for 6 drivers, no problem. Otherwise you have to generate a combined signal somewhere to get the combined bass. Sometimes your TV will do this for you. Even music goes thru my TV.

Some entertainment amplifiers already have an augmented bass channel, e.g. 5 + 1 higher power. In this case, what do you do with the spare regular channel? Course you could leave it unconnected.

As always, you will get better feedback if you provide the model number or a link to the item.

w
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Old 15th February 2009, 09:23 PM   #7
jamikl is offline jamikl  Australia
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Thanks for the replies. I don't know the model number of the receiver and won't be able to get back there for a few days. I would use it with an Ashley pro crossover which does have balanced inputs and outputs but can be used with single input RCA plugs. I know this is not an ideal setup but as suggested it is hopefully an economical way to get started.
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Old 15th February 2009, 09:37 PM   #8
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see http://www.linkwitzlab.com/index.html for the active crossover bible. Not sure if your XO does everything you need.
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Old 16th February 2009, 10:13 AM   #9
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Default ...getting out his crystal ball...

Is that this: -

http://www.dealtime.com/xPO-Ashly_As...NO_3_WAY_Xover

Ashley crossover???

We're not all not all clairvoyants here, just engineers.

w
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