What to know about Bose

zakimak

Bold statement...yet not entirely correct.

Non-bose specific and or vehicle specific speakers can be installed but will unlikely yield the desired effect - namely improved sound quality to a degree that is satisfactory given the investment in the aftermarket speakers. The difference in efficiency, overall impedance and frequency response of the replacement speaker will likely give an undesirable effect but it is not absolute.

There are too many variables given the integrated design of the Bose system to really have an absolute idea how the aftermarket speakers will interact with the existing Bose amps. The Bose system integration include consideration for amplification and its' speaker specifications including placement. Something that without complete specifications, would be guess work when replace one component in the chain.

I agree in principle if one were to replace the speakers, the rest should to be discarded especially in the Z Bose system. There's a work around but that requires either disabling the dash speaker (if one were to use a 2-way at the door - for example or rewire/relocation) Component sets will require two separate cross-over to ensure proper frequency distribution and double check impedance responses given the x-overs plus knowing the output from the Bose amp...the list goes on. The bottom line is that it is much more difficult to make the Bose amp work well with aftermarket speakers than replace it all. That said, I've replaced a door speaker on a Bose system with a two way in the door in the past on a 240SX with no problems. Frequency response improvement was definitely noticeable.

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bigaudiofanat

What year 240? Post 1998 did not have the sound processor bose has now to omit certain frequencies from the audio it is reproducing.
I would rather give safe advice and say they are not compatible rather than saying maybe and someone blowing their bose amp up. Do some speakers provide the same ohms rating as stock, yes, however they may not be as efficient in producing sound as the paper bose speakers. And adding a set of component speakers in a bose system of the z is not that simple. The bose has a output for each speaker coming off the amp, so feeding a set of component speakers a full range signal can only be done after summing the signals of the low and high ouputs of the bose amp.

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zakimak

True on the vintage of the 240 and I could only quote from my experiences as I was the one that installed it. A friend had his 2010 Maxima 'upgraded' to 2-ways pioneers which worked to his liking, so I have observed that it has been successfully integrated. So to say it is not compatible is not true. HOWEVER, I never endorsed it nor said it was simple, especially in the Z system. What I did say was that it was possible but in my opinion not worth doing without further investment.

As for Bose amp blowing up, have you actually witness a situation where "someone blowing their bose amp up" as a direct result of replacement speakers?

As for the "sound processor", what Bose did back then was limit the output at the maximum capability of the amp without distortion as it only allowed the amp to drive to predetermined output. Some system had an active loop which would feed back to the amp to prevent clipping thus distortion. So there is some processing involved. It had a variable equalization curve similar to variable 'loudness'. It simply flatten out from a U curve as the voltage increases to the maximum. AudioControl analyzer confirmed this. I haven't confirm it via test equipment but only by ear and based on that, I have to agree the Z's Bose system low and high end seem to begin to roll off at '22-23' on the radio indicator rather than flatten out. Maybe my ears are playing tricks but until it is confirmed with test equipment, that's all I can base it on. So with that, I agree with your assertion the Bose system "omit" frequencies.

As for "summing the signals of the low and high ouputs of the bose amp". You really need to clarify how this is done before I respond. I don't have in depth knowledge of the what exact signals goes to the dash speakers and to the woofer in the Z's system at this time but assuming the dash speakers are fed only high pass and the woofers are fed with low pass signal from the amp in agreement with your statement "the signals of the low and high ouputs of the bose amp", I'd like you to explain in detail your 'summing' network.

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