I'm not sure where you are getting your information, but to me it seems only 50% accurate.
There are a number of good speakers that are great for music and home theater and there are are a number of subs that are great for reproducing music, although they may not be available at best buy and they may cost more than $200. A subwoofer can't affect stereo imagery because the wavelengths produced by a sub are larger than your head, your ears aren't able to locate the sub in a well tuned system because the sound from the sub reaches both ears at the same time. If you think you can hear a sub's location it's either playing frequencies that a sub shouldn't be playing or it's because you can see the sub and your eyes are fooling your ears. Inexpensive subs intended only for home theater do not reproduce music very well because the driver isn't constructed to move fast enough to reproduce highly dynamic sounds found in music, home theater sounds are less dynamic and don't demand high quality construction. A low quality sub is often referred to as having muddy sounding bass. I don't believe I've ever seen this described as affecting stereo imagery.
An amplifier is designed to amplify a signal, a pair of amplifiers, an input selector switch and a tuner make up a stereo receiver. A 5.1 receiver is made of the same components plus a decoder and a few extra amps for the additional channels. As far as the signal sent to the speakers is concerned there is no difference between a stereo receiver and a home theater receiver, the amps are the same. A HT receiver may have a HP crossover on the mains so music might sound anemic without the powered sub turned on, if the crossover is turned off so that the speakers are playing full range there should be no audible difference. Denon is a pretty respectable name in consumer audio, unless the unit is malfunctioning (which it isn't, it's going into protect mode for a reason with the speakers in question, it's not a bad solder joint) it should sound just as good driving a pair of speakers in stereo as it would driving 5 speakers in surround. A pro amp is a pretty extreme recommendation considering the speakers the OP intends to run are 8 ohm. Pro receivers usually are recommended for their ability to power speakers with lower impedance. I believe there is a problem with the wiring or a problem with the speakers if the receiver is going into protection mode, the bose speakers should be pretty easy to drive with a consumer receiver.
Less expensive amplifiers can sound pretty decent, I'm not sure where you're getting the idea that only a Marantz will make the these Bose speakers sound good, you'd need a really nice set of speakers to actually hear any difference between a Marantz amp and any other, the OP doesn't own those speakers.
You missed everything that I explained in my previous post. Let us start with the subwoofer. Yes, a subwoofer can and it does affect stereo imagery. Music does not have a standard way to store bass. In can either be in either the left or right channel, but not both. If you check the wave form using a spectrogram, you will notice that bass is not always in both the left and right channels. It is actually either the left or the right. Old music will flip-flop between left and right during the music.
The human brain can predict where it is going to come from because it is a quantum computer. If one subwoofer is used and it is placed on the left or the right channel and the bass is going to come from the opposite channel, the bass will seem awkward. Sure two subwoofer can be used to help bring back the stereo imagery, but one of each have to be beside the left and right channels. Using one subwoofer in the middle of the left and right channels will affect the stereo imagery of the music.
About the high pass filter for AV receivers. This can be changed easily. This can changed to large or the full range of 20 Hz to 20000 Hz. If using bookshelf or monitor speakers, the setting might have to be set as small or with a high pass filter of 80 Hz to150 Hz. These speakers will seem "anemic", but this is why I recommend to use large speakers to handle it.
Subwoofers are slow because of one thing the weight of the suspension and the inductance. The inductance matters most to speed. If the inductance is too high, the woofer will be sluggish. The heavy suspension can literally tear it from music output. Music is more powerful compared to movies. Subwoofers are meant for movies because the output is not constant
Music in movies is remastered to be compatible with a multi-channel and subwoofer setup. The bass from the music is then positioned in the subwoofer channel or combined in the left and right channels.
Not all amplifiers such as Denon and Onkyo have sufficient quality to handle musical output. Marantz is a step up for quality of the amplifier, so it can handle the output better because it has beefier electronics. I just state the Marantz as a suggestion and I did not state anything about the sound quality of the amplifier. If you do not like it, suggest something else. You did not, so shut the f*** up.
In conclusion, do not need a big head to hear where bass is coming from. What is not said is bass is also a tactile experience, so it gives another reason why we can locate where the subwoofer is.
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