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Old 13th February 2013, 11:25 PM   #1
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Default Tapped horn little project

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:

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Any advice or suggestion are welcome !

Last edited by miniac007; 13th February 2013 at 11:28 PM.
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Old 14th February 2013, 01:54 AM   #2
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looks like you run out of excursion around 17 watts
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Old 14th February 2013, 07:19 AM   #3
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Hi TundraLDT,

you pointed it out !

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

Click the image to open in full size.

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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 ?
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Old 14th February 2013, 12:53 PM   #4
Xoc1 is offline Xoc1  United Kingdom
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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.
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Old 14th February 2013, 01:16 PM   #5
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Ok thanks.

I have a old Marrantz PM43, 30 watts x 2 at 8 ohms to test it. But after I'd like to get a little one. What do you think of Gainclone LM3886 based amp for this usage ?
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Old 14th February 2013, 01:32 PM   #6
Juhazi is offline Juhazi  Finland
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The response starts at 30Hz and huge cone movement below it. I would not use this as a subwoofer for HT! At least you must be careful with power.
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Old 14th February 2013, 02:24 PM   #7
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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 ?
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Old 16th February 2013, 03:48 AM   #8
OscarS is offline OscarS  United States
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seems a bit high for a HPF here. The response will be cut starting just slightly above what you set it at, so in this case, I'd do a 25Hz HPF so it doesn't affect the low-30Hz response too much.
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Old 16th February 2013, 09:55 AM   #9
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Ok thanks !
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Old 16th February 2013, 04:54 PM   #10
bjorno is offline bjorno  Sweden
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Default 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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File Type: jpg SPA-10PA-TH_more.jpg (891.4 KB, 36 views)
File Type: jpg SP10PA_OD(TH)_stuffing.jpg (926.0 KB, 44 views)
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