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rvito
12-28-2011, 07:14 PM
Any suggestions for a Height for Jbl 4435s, I currently have these on stands about 30" High. Great sound stage but seem to be lacking in the bass department.

herki the cat
12-28-2011, 11:59 PM
Any suggestions for a Height for Jbl 4435s, I currently have these on stands about 30" High. Great sound stage but seem to be lacking in the bass department.

Friend, rvito;326214, "lacking in the bass" has surfaced in a recent post where some one had a large room which was " bass-shy" due to the prevailing very high density reverberation in the "mid high frequency spectrum" attending a typical 80 Db-C (SPL) aka, "sound pressure level" direct sound from the loud speaker due to lack of wall to wall floor rugs, over stuffed furniture etc, room damping support.

Not being familiar with your room, I can not assume that high density reverberation in the "mid high frequency spectrum is responsible for loss of bass in your case.

However, consider that high density mid range reverberation results in a perceived 26 Db-C loudness increase (due to reverberation stretching out the sound duration) above the direct SPL 0f 80 Db loud speaker sound.

Google: Fletcher-Munson-curves Which indicate that having turned the bass down 26 Db, results in human hearing perception of a 40 Db decrease in the bass spectrum loudness and there goes your bass loss.

This 40 Db reduction attends in the natural human hearing mechanism to reduce low frequency noise masking of voice articulation in the presence of noise like "rumbling truck traffic, etc.

In any case, if you place the speaker on the floor a little separated from the back wall, you will gain a six Db increase in perceived loudness from your speaker due to the virtual image below the floor.

You can study this complicated "half-space" subject in a post which has been slightly revised, now available in PDF form by Clicking this button: Get it here (http://www.fulcrum-acoustic.com/wordpress/wp-content/uploads/2010/11/Comments-On-Half-Space.pdf).

This tutorial www.fulcrum-acoustic.com/2010/11/daves thoughts on space,does not address the reverberation problem, but it will explain "what happens with the speaker resting on the floor", and that "Off the floor" changes things significantly.
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BTW, a tid bit here, courtesy of Wikipedia on hearing problems in recording studios applicable to home listening... not totaly off- topic:

As your ears get more fatigued by listening, you need to keep increasing the volume for it to seem as loud as it did half an hour before. By the end of the night, those things are screaming, but to you, the volume seems about the same as when you started.
The Fletcher-Munson-curves were developesd in 1933 by Harvey Fletcher and W. A. Munson. If you want to get bleary-eyed, Google these scientists and read about their research. However, here’s the skinny on how it applies to our problems.

The subjective equalization of the ear changes with volume. The lows and the highs are much easier to hear at louder volumes. A Fletcher-Munson Curve illustrates that, as hearing fatigue causes you to crank it up, you will hear the bottom and the top with much more clarity.

At a normal human volume level, you are going to hear all of the mid-range instruments with what will seem like the lows and highs filtered out. So now you know why what sounded so awesome last night, sounds so awful this morning.
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herki[Quote/]

Lee in Montreal
12-29-2011, 05:49 AM
Any suggestions for a Height for Jbl 4435s, I currently have these on stands about 30" High. Great sound stage but seem to be lacking in the bass department.

The same speakers, any speakers, can sound from heavenly to horribly, depending on the room and the location of the speakers. If you could share a few more details about the room and the speakers' location, then perhaps we can help. Also, "lack of bass" can depend on the listener's musical taste and type of music. If you are happy with the overall sound, but only crave for more deep bass, then a pair of subs will solve your problem and feed your crave.

Hey19
12-29-2011, 03:10 PM
The same speakers, any speakers, can sound from heavenly to horribly, depending on the room and the location of the speakers. If you could share a few more details about the room and the speakers' location, then perhaps we can help. Also, "lack of bass" can depend on the listener's musical taste and type of music. If you are happy with the overall sound, but only crave for more deep bass, then a pair of subs will solve your problem and feed your crave.


That should wake them up.