Tapped horn little project

miniac007

Member
2013-02-13 4:26 pm
Hello,

I am starting a new project with a little tapped horn based on this one: Bass mit 10Zoll Tapped Horn - HiFi Forum

The driver is now unavailable, so I planed to use this one: SPA-10PA

I played a little with hornresp and i get this:

[IMGDEAD]http://nsa31.casimages.com/img/2013/02/13/130213015053325157.png[/IMGDEAD]

[IMGDEAD]http://nsa31.casimages.com/img/2013/02/13/130213015119896620.png[/IMGDEAD]

[IMGDEAD]http://nsa32.casimages.com/img/2013/02/13/130213015148572058.png[/IMGDEAD]

[IMGDEAD]http://nsa31.casimages.com/img/2013/02/13/130213015212265167.png[/IMGDEAD]


Any advice or suggestion are welcome !
 
Last edited:

miniac007

Member
2013-02-13 4:26 pm
Hi TundraLDT,

you pointed it out !

The limit seems to be 16W for 117 db SPL.

[IMGHTTPDEAD]http://nsa32.casimages.com/img/2013/02/14/130214092030768595.png[/IMGHTTPDEAD]

[IMGHTTPDEAD]http://nsa32.casimages.com/img/2013/02/14/130214092102965263.png[/IMGHTTPDEAD]

So is it a problem for a TH for HT in a 25m2 = 280sqft room (listening distance at 2.8m = 9.5 ft ? Do I need much ? Or what should I do to improve that ?

Is a class T amp of 20W will be a good solution to drive it thru a miniDSP for pass band filter ?
 

Xoc1

Member
2008-11-08 8:25 pm
Devon UK
As long as you use a hi pass filter I would at least double that power rating for the amplifer.
Dependent on the driver and how it behaves when pushed past Xmax you could probably use even more.
Hornresp does not take into account any thermal compression in the driver.
You dont want the amplifier to clip as you get towards Xmax.:)
 

miniac007

Member
2013-02-13 4:26 pm
I will have a high pass filter to cut at 30Hz. I want to test TH, and it is the best price/qualty 21" driver I found easily available with flat response and that reach 30Hz to 100Hz. 50€ = 65 $.

Do you know other low cost drivers which perform well down to 30 Hz in TH ?
 
A Monacor SPA10PA TH that can be stuffed

Hi,

IMO, (After doing a math check.. the first one done here?): You need at least a BW 4 HPF at ~32 Hz; or a LR4 just below 30Hz to preserve a use of maximum available cone excursion before x-max limits the possible BW.

b:)
 

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miniac007

Member
2013-02-13 4:26 pm
Hello Bjorn, very nice Math ! Thank you very much.

I want to ask you which kind of response curve will perform better, n°1 or n° 4 ?

N°4 is flatty, little more SPL, but N°1 goes lower. Which will be the best for HT tapped horn ?


@Tinitus: "but try ask yourself why its got such weird high Qts ?" Lower Qts == higher prices
 

miniac007

Member
2013-02-13 4:26 pm
Hi all,

I have an other question about the horn building: I want to have a side opened mouth like DTS-10, but I don't understand in this case how to measure L34 and S4:

[IMGHTTPDEAD]http://nsa32.casimages.com/img/2013/02/17/130217102620568859.jpg[/IMGHTTPDEAD]

- Is S4 always the end of the section (S4-2) or is it the area of the aperture (S4-1) ?

- How to measure L34:

* Begining of the aperture L34-1 ?
* Axis of the aperture L34-2 ?
* End of the aperture L34-3 ?
* Always the end of the section L34-4 ?

Thanks !