High Qts speakers (two of the three): what to do with them?

[zintolo]

Hi, I have some of those speakers:

They are not Hi-Fi, but electric bass and electric guitar speakers and I would like to know if there are some typical hi-fi cabinet configurations that can be adapted to those speakers to help in reproducing deeper lows.

Please consider that most guitar amps reduce their feedback in low (and high) frequencies to use the resonance of the speaker/cabinet to increase the reproduced lows.

I know that it isn't an hi-fi question, but the knowledged people about how to design speaker cabinets are here.
Thanks for any possible suggestion,

Kind Regards
Roberto

 

[AllenB]

Guitar speakers can be open baffle, which suggests they could work infinite baffle, which may lead to aperiodic.

 

[GM]

Basic max flat vented alignment automatically yields < Fs tuning:

net volume (Vb) (L) = 20*Vas*Qts'^3.3

box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96

[Qts']: [Qts] + any added series resistance [Rs]: http://www.mh-audio.nl/Calculators/newqts.html

 

[zintolo]

Thank you @AllenB and @GM ,

I will try to simulate both and see the differences.
Is there a specific software that works best with this kind of cabinets?

 

[planet10]

Either OB or as big a box as you can live with, and make aperiodic if needed to reduce any bass hump.

dave

 

[yogiDIYbear]

For OB simulations in your desired baffle size, Basta would be helpful.

https://www.tolvan.com/index.php?page=/basta/basta.php

 

[OldDIY]

#1-2 Large closed box with Q<=1. You won't get the lowest bass.All midbass speakers.
#3 can be used in a ported box or bandpass. The bass will be lower.
Use any available calculator.

 

[zintolo]

Actually I have one #1 and one #2 (it is quite common to mix different speakers in the same cabinet to have the possibility to have different sounds when close miking the two speakers) in the same cabinet, semiopen on the back as per photos below. Is it technically an open baffle?

 

[Freedom666]

It is quite easy to EQ a resonance down and add some deeper bass with an EQ on a smartfone if it has to be cheap. Or you buy a Behringer DEQ2496 (or any other one) with its microphone you can EQ any speaker out

 

[OldDIY]

Is it technically an open baffle?

Sort of like a ported box...

 

[Freedom666]

Example how to do it, here I discuss this:

https://www.diyaudio.com/community/...fication-to-current-drive.389985/post-7197710

 

[Freedom666]

If you use a ported box, bass reflex, just take care not to augment frequencies below port resonance

 

[zintolo]

It is quite easy to EQ a resonance down and add some deeper bass with an EQ on a smartfone if it has to be cheap.

Thanks, but I would like to understand cabinet effects on speaker performance, not electronic effects.

 

[Andrew Eckhardt]

You're right. With a hole that small it Will behave like a ported box. With speaker q already so high you might find the sound boomy with the peak being higher than open E fundamental.

 

[GM]

+1 A simple baffle thickness reflex such as this one has only a fundamental peak with max acoustic efficiency when Av = Sd, hence the pioneer's recommending 1:1 as the max size ratio, so to tune lower one can only shrink the vent and/or lengthen it, which in turn has open cylinder resonances that comb filter with the driver's output.

 

[AllenB]

I wouldn't be sure, baffle thickness ports often seem smaller than this.

 

[GM]

It just means it's tuned high, so based on the 1st post's driver's Fs and factor in that in prosound often tuned somewhat higher, using driver Fs to fill in the bottom/protect the driver............

 

[zintolo]

Thank you guys, so for speaker #1 and #2 what I can do first is work on existing rear baffle with:

• an hole at least of 2x Sd (being two speakers);
• an hole even smaller than the actual one;
• fill part of the cab and fix a dampened hole for aperiodic.

The latter will be beneficial in raising the impedance below 200 Hz but limiting the peak: it will most probably work best with the "low-mid boost" circuit of most guitar amps, that reduces the feedback in that range of frequency (with the disadvantage of loosing control on lowest notes of the instrument).

Is the Karlsonator a possible choice?

 

[GM]

Hmm, IIRC the Karlsonator is a simple pipe horn with a Karlson slot, (notch resonator?), so if properly designed/tuned should work fine, but I leave it to Freddi /others more experienced with it to go further.

 

[zintolo]

Thanks GM to point me @freddi , I hope he will chime in.

From what I've read (attached a document on the topic) a good thing about the Karlson is that the sound has an uniform pattern over 120° up to 10 kHz, that would help to be heard by the rest of the band onstage: typically guitar speakers (and often amps as well) cut sharply above 5 to 7 kHz.

More infos here: http://home.planet.nl/~ulfman/