Blows ..or.. Bose ..or.. Buy.Other.Sound.Equipment

audiodelic · #61 1st June 2008, 01:35 PM

Good post, explanation.

So are you saying nominal impedance doesn't tell you anything. Isn't it more likely a 4 ohm speaker to dip lower in impedance when the bass hits comparably to a 8 ohm speaker. In turn requiring a more robust amp section to handle those dips ..... ( although it also depends on number of drivers etc. )

Quote:

Originally Posted by arj

Nominal impedance tells you squat about amplifier rating and sensitivity means nothing without efficiency which noone ever mentions !

do you really think that every 90 db 8 ohm speakers need the same power ? it could mean anything from a SET to a 50W load requirement

a phase curve and impedance curve will definitely tell you a lot ..but how many speaker manufacturers are willing to share that ?

and about that amplifier rating of 25 Wat 8 ohms..does it mean anything ? it could mean 15 W to 50 W at 4 ohms what you need is a response curve of it with changing load !

Following everyone else just because they are doing something meaningless is not as per me something very commendable ! would rather respect the "think different" guy whose actually says that they mean nothing !

again ..i dont mean to say Bose is an audiophile system..just cut them some slack..they are not intended to be put in the category you are comparing them with !
just think he was the first guy who successfully broke away into smaller speakers at a time when people thought hifi speakers were about the size of wooden cupboards and that bass and the rest had to come from the same body !.

arj · #62 1st June 2008, 03:13 PM

Quote:

Originally Posted by audiodelic

Good post, explanation.

So are you saying nominal impedance doesn't tell you anything. Isn't it more likely a 4 ohm speaker to dip lower in impedance when the bass hits comparably to a 8 ohm speaker. In turn requiring a more robust amp section to handle those dips ..... ( although it also depends on number of drivers etc. )

well not really. a lot depends also at what frequency the impedance is at the lowest as well as the phase at that point..
eg a dynaudio Audience 52 is a 4 ohm 87db speaker which makes it sound as though it is difficult but is really not so tough to drive. the B&W 805 which is a higher 89db 8 Ohm speaker does have dips as low as 3 ohms at some frequencies hence requiring a more powerful amp.
i used to own JMR twins which are 89dB 4 ohms...but 4 ohms was the lowest and that too at around 60 hz so bass was never a problem even with 10W amps.

so going by specs as given by manufacturers can be very misleading.

unfortunately in audio we are not even sure as to what measurements do give a true picture of sound quality..hence specs in many cases actually lie

eg proac tablette/response etc give their low freq extension as 38Hz..which can be pretty astonishing..but these are not a 3dB. but they do mention that lab measurements and room measurements can be so way off that the anechoic measurements in actuality have no significance !!

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