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Old 19th December 2010, 11:42 PM   #111
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Bass notes are at the lower end of what the ear can hear.
The ear frequecny response drops off at high and low frequencies.
This means to hear low notes you need a lot more power that to hear midrange notes.

This probably means your speakers are hitting xmax and causing the problem you mentioned.
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Old 20th December 2010, 01:06 AM   #112
tinitus is offline tinitus  Europe
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maybe its a bit more than just about Xmax ratings

well, I guess you can give it all the Xmax in the world, and it wouldnt help any bit if the "motor", magnet and voice coil isnt strong enough

a 2" voice coil with a small magnet (high Qts) might simply not be strong enough to control the cone
and further, your power amp may even have highish output impedance, to make things even worse

but I wonder if the specced 4mm Xmax of your woofer is one way or P-P
but fore a loud playing rock band its hardly gonna work, either way

btw, PE has a 21" Pyle on sale, but no Xmax specs
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Old 20th December 2010, 08:00 AM   #113
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It always depends what one wants to achieve. There are situations where one 10" driver would be enough (like accompanying acoustic instruments on a small stage).
And it also depends on the instrument and the sound one wants to achieve. If your bass is overtone-rich it would automatically sound louder with a given maximum displacement compared with the one who wants the typical muffled reggae bass sound (Which would need loads of 18" drivers).

Michael Manring for instance uses two 2x10" speakers on stage which is by far enough for what he does (he has a very overtone-rich sound and plays a lot of harmonics and does a lot of melodic stuff). OTOH not even an amateur player in a heavy-metal band would probably be satisfied with the same rig.

I once built a tiny practice amp ( "Brüllwürfel" for the German speaking ones). It has just about 4 Watts and a small full-range speaker by Monacor. It also has asymmerical clippig and some bit of compression. With my old overtone-rich Kramer DMZ 6000 B it sounds astonishingly loud in a living room when driven hard. It also employs an output cap that interacts with the speaker such that its output level is enhanced a little in the area of the cutoff frequency. Below that the response dropps off with 18 dB / octave.

When I plug my newer six-string bass into it and play the open low B I hear nothing but some farting sound. I.e. the amp goes into clipping but nothing of the first harmonic is reaching the speaker and also the second harmonic is greatlyy reduced. That's why I asked about the output cap BTW.


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Old 20th December 2010, 09:30 AM   #114
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Why not just add a steep low cut filter below port tuning?

The driver unloads below Fb, but still within the range of a standard-tuned bass (bottom E is 41Hz). If your amp doesn't have one already (to cut out effects like string handling), then this would be a worthwhile thing to do.
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Old 20th December 2010, 12:53 PM   #115
bigbeck is offline bigbeck  United States
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Fb is 47Hz. How do I make this filter and where do I put it?

Don
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Old 20th December 2010, 01:06 PM   #116
AndrewT is offline AndrewT  Scotland
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a line level filter at the input of the power amp would work.
You can keep it simple and go for a 2pole unity gain filter wrapped inside a single opamp feedback loop.

For steeper cut, use two opamps for a 4pole active filter.
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Old 20th December 2010, 01:38 PM   #117
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2nd order should usually be enough. Depending on the circuit one could also redimension some coupling caps.

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Charles
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Old 20th December 2010, 08:47 PM   #118
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Old 21st December 2010, 03:19 AM   #119
tinitus is offline tinitus  Europe
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would Aguilar be the magic word ?
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Old 23rd December 2010, 09:11 PM   #120
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No idea. Likely more expensive than a couple of resistors, capacitors and op-amps though.
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