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#269688 - 2017-11-10 15:53 551 used as a pre amp for a 557
Registered: 2006-05-08
Posts: 22
Navara Offline
Harmless
Navara Offline
Harmless

Registered: 2006-05-08
Posts: 22
Loc: Co. Durham. UK
Hello all,
My system for 14 years has been a 507 CD, 551 amplifier and Spendor SP2/2s.
With an upcoming house move, I have decided to adjust the system for a more room/wife friendly appearance.
The 507 CD and the Spendors are now sold and I have purchased a Bluesound Node 2 (for Tidal and MQA) and obtained some nice ex demo B&W CM8 S2s for a good price. The dealer reckoned that the speakers were easy to drive with my 551. Specs rate them as 8 ohm and can be matched to 30-150w amplifiers.

Very early on I heard sudden loud popping from the bass drivers with the amplifier set at 75. (My old Spendors could sing all day at 84). I am sure this isn't due to excessive speaker travel and more likely the amplifier clipping. It wasn't exactly playing loud.

Delving online for further info on the B&Ws, I have now found out that these speakers dip to 3 ohms in the low frequencies and require bags of current. So now I am looking at my options without breaking the bank.
I'm now considering purchasing a 557 power amplifier and using the pre amp outs from my 551.
My question is, will they work well together and power the B&Ws with ease?
Any advice will be gratefully received.


David Gilmour, guitar god.
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#269691 - 2017-11-10 16:16 Re: 551 used as a pre amp for a 557 [Re: Navara]
Registered: 2003-10-04
Posts: 1,846
spinaltap Offline
Knows where his towel is
spinaltap Offline
Knows where his towel is

Registered: 2003-10-04
Posts: 1,846
Loc: Bournville, UK
Alternatively, buy the 555 currently on eBay and bi-amp the speakers with the 551/555 combo.


My Mac can go all the way to XI

Meridian owner since 1994 - Mac user since 1988.
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#269697 - 2017-11-10 16:38 Re: 551 used as a pre amp for a 557 [Re: Navara]
Registered: 2001-05-23
Posts: 2,587
Gianni Offline
Great Green Arkleseizure
Gianni Offline
Great Green Arkleseizure

Registered: 2001-05-23
Posts: 2,587
Loc: North London, United Kingdom
My experience of big floor-standing B&Ws are that they can be the devil to drive.

The 557 should do it - it is an excellent and massively underrated power amp with oodles of drive. Expect to pay £600-£800. Listen before buying to see if the transformer hum from the chassis is present, though it is not that common.


Various DSP speakers and Meridian processors
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#269715 - 2017-11-11 00:10 Re: 551 used as a pre amp for a 557 [Re: Gianni]
Registered: 2006-05-08
Posts: 22
Navara Offline
Harmless
Navara Offline
Harmless

Registered: 2006-05-08
Posts: 22
Loc: Co. Durham. UK
I've thought about the 555, but I'm liking the idea of having the extra power in the tank, I think these speakers need that margin.
So a 551 can be used as a pre amp for the 557?


David Gilmour, guitar god.
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#269716 - 2017-11-11 04:41 Re: 551 used as a pre amp for a 557 [Re: Navara]
Registered: 2012-02-22
Posts: 109
Oddiophile Offline
Hitchhiker
Oddiophile Offline
Hitchhiker

Registered: 2012-02-22
Posts: 109
Loc: NY, NY, USA
If you like the sound of the 551 you should find the sound of the 551/557 better as the power amplifier will not clip like the power amplifier section of the 551 will driving a difficult load. Same house sound, all Brit, will be delightful.


#1 AC200, MC200, DSP420
#2 M80
#3 AC200, Ensemble, DSP-5000.1, TT
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#269717 - 2017-11-11 07:55 Re: 551 used as a pre amp for a 557 [Re: Oddiophile]
Registered: 2006-05-08
Posts: 22
Navara Offline
Harmless
Navara Offline
Harmless

Registered: 2006-05-08
Posts: 22
Loc: Co. Durham. UK
Okay thanks, just what I wanted to hear, thanks.
I'll heed the warning about the transformer hum, does it spell big problems?


David Gilmour, guitar god.
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#269718 - 2017-11-11 09:24 Re: 551 used as a pre amp for a 557 [Re: Navara]
Registered: 2001-05-23
Posts: 2,587
Gianni Offline
Great Green Arkleseizure
Gianni Offline
Great Green Arkleseizure

Registered: 2001-05-23
Posts: 2,587
Loc: North London, United Kingdom
Originally Posted By Navara
I'll heed the warning about the transformer hum, does it spell big problems?
Do a google search of this forum (see link top left of the page) on 557 and hum for various experiences.


Various DSP speakers and Meridian processors
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