Reed 38hz tapped horn - Page 5 - AVS Forum | Home Theater Discussions And Reviews
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Old 03-27-2010, 01:53 AM
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Quote:
Originally Posted by lilmike View Post

Hey boy - get that cat back in the bag!

This is a little design that I came up with here, and further discussed here, with more complete info included a few posts later.

The idea was a "rest of the world" type of sub - reasonably sized with respectable performance. A pair placed along walls or in corners should be adequate for 99% of the potential users. That last 1% all post in the forums I frequent, and are all reading this, so this is not a high-powered monster home theater sub for you. It should be a decent little sub and it really is designed to be used in multiples. A pair of these should get to 100 dB at a typical LP from 25 Hz on up with ~100 watts per driver. Four should do reference levels plus.

Looks like radman12 has done a great job building it (thanks!), and his initial listening impressions are favorable. I've got my measurement gear packed up and ready to go, and should have these (as well as his other efforts) measured some time tomorrow evening.

Rest assured, if this measures as it should, details, measurements, and full plans will be posted. As I've said in the past, I don't want to waste other people's time with my simulations and designs if they do not work out.

Excellent job on the build radman12!

Measurements are done. It is legit.

25 Hz to 100 Hz flat. I'm not kidding.

Efficiency was the compromise on this one. This is no home theater monster sub. Remember: Loud, Low, Small - Pick any two. I chose low and small.

It measured within a dB of the hornresp predictions.
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Old 03-27-2010, 05:31 AM
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Quote:
Originally Posted by lilmike View Post

Excellent job on the build radman12!

Measurements are done. It is legit.

25 Hz to 100 Hz flat. I'm not kidding.

Efficiency was the compromise on this one. This is no home theater monster sub. Remember: Loud, Low, Small - Pick any two. I chose low and small.

It measured within a dB of the hornresp predictions.

NICE!!! ok... so where are the plans?

EDIT: Forget it... I see the new thread... just waking up...
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Old 03-27-2010, 05:41 AM
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so small, clean, powerful and a pretty flat response down to even 25Hz?

When I post this sort of description using a 6.5" driver on the Subwoofer for what does everyone think the response will be ?

There is no love over there for Tapped horn designs. Nothing at all. The comercial market needs to catch up to this alternative design.

It is not "open-minded" to reject knowledge - Bob Lee
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Old 03-27-2010, 07:00 AM
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Quote:
Originally Posted by lilmike View Post

25 Hz to 100 Hz flat. I'm not kidding.

I knew I did the right thing putting my 5" horn on hold. Wanna play with an Anarchy now
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Old 03-28-2010, 02:30 PM
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Here are some measurements of Todd's 38 Hz build.



Same measurement methodology that we used on his Anarchy TH, drive level is 2.0 V for 1W into a 4 ohm driver. On this plot, red is with a series inductor, blue is without. While there was certainly some added resistance due to the clip leads I used to insert the inductor, most is due to the DCR of the inductor.

The inductor clearly cuts the peaks at the ends of the passband more significantly than the trough in the middle, so it is doing what was intended. It also attenuated the upper frequency response significantly, as would be expected.
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Old 01-14-2011, 04:48 PM
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This is another awesome TH build! Regarding the inductor, if the sub will be xover'd at 100Hz, is it still worthwhile to have it? It looks like it drops overall response by a dB.

Also, does anyone have a recommendation on a plate amp with a high pass filter suitable for this sub?
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Old 01-14-2011, 09:33 PM - Thread Starter
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i been running them with a dayton240, which according to a tech support call to parts-express they say it has a 17hz high pass. the amp itself has been more than adequate. i have also ran them with the inductor inplace, these inductors now collect dust, they are useless, atleast to my ears.

if you really want a badass highpass, checkout the minidsp. i truly would not be worried about a steep highpass on these guys i have reefed on them and never heard bad noises or smelt anything funny.
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Old 01-14-2011, 09:37 PM - Thread Starter
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little update, covered them with some $20 laminated blash ash vinyl veneer from parts express. Came out real good! Just need to make a little cloth grill and they will be complete


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Old 01-14-2011, 10:23 PM
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Those turned out very nice!! Let us know how they sound with movies.
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Old 01-14-2011, 11:32 PM - Thread Starter
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i played them with movies before i did the anarchy 25hz tapped horns, they were definately loud, but didnt dig real low as thats not their intended application to get down
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Old 01-14-2011, 11:48 PM
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Great job, radman12! Those have a professional finish to them now. The finish matches my Energy RC10 speakers You chose a phenomenal finish! Did you use this: http://www.parts-express.com/pe/show...%20ash%20vinyl
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Old 01-15-2011, 01:13 AM - Thread Starter
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max that is it. it matches my studio monitors perfectly too, for 20 bucks cant wrong to give them a little better look
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Old 01-15-2011, 01:47 AM
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Awesome! They look great. I've been researching all day on speaker finishes from gloss piano black to truck bed liner, and this is the winner. Hopefully I can find it locally as it will cost $23 to ship to me from PE
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Old 01-15-2011, 02:42 AM - Thread Starter
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looks like you better put some more stuff on your order so you get free shipping
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Old 01-15-2011, 03:51 AM
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Unfortunately free shipping is just for the continental US. I'm in Hawaii and shipping here is ridiculous! Shipping just one of these W6-1139SI speakers cost $27
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Old 11-06-2011, 08:52 AM
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Hi,

Sorry to dig up an old thread. I'm thinking of building Erik's 38Hz.

LilMike's measurement of Todd's build shows the level down by a few db and nothing about a smooth response, except ~200Hz & above. So the question - is the inductor really needed ? What does it do and can the cost be avoided ?

Any help or pointers would be great. Thanks.
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Old 11-06-2011, 08:26 PM
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Quote:
Originally Posted by jocelys1 View Post

Hi,

Sorry to dig up an old thread. I'm thinking of building Erik's 38Hz.

LilMike's measurement of Todd's build shows the level down by a few db and nothing about a smooth response, except ~200Hz & above. So the question - is the inductor really needed ? What does it do and can the cost be avoided ?

Any help or pointers would be great. Thanks.

I sort of touched on this over in the T-6 thread. I think that we're seeing the inductor work to trim the peaks in the response, because I see more getting cut at the peaks than in the saddle, as well as the SPL decrease with higher frequency due to the lowpass. As I understand it (and - I don't fully...), inductors don't like to see changes in current. Low impedance = high current. Impedance minima are close to (but not exactly) where I see the most impact from the coil on the above measurement. The lag may be due to phase.

I see no reason to use a series inductor. If I recall, radman12 is not using them on his either. You can always add it externally if you feel you need it later.
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Old 11-06-2011, 08:36 PM
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Thanks Mike.

For those interested, there's also more explain in this thread from diyaudio.com.

http://www.diyaudio.com/forums/subwo...pped-horn.html
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Old 11-13-2011, 05:22 PM
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Hello to all, i have a question concerning Hornresp. When i simulate a speaker for tapped horn i can get good flat FR,the problem is xmax.I have simed 450W drivers,but when i look at the max SPL wave there is always clipping.How can Hornresp. show a 450W sub reaching maximum xmax with only 2.83V?.I have tried lots of Hornresp. input data found on this and other sites,but i can't seem to grasp this xmax and clipping shown in Hornresp.
I know what xMax is,what i can't understand is why i am getting maximum xmax with only 1W mostly when the FR is flat and looks good,any thoughts anyone?,help.
Thanks.
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Old 11-13-2011, 08:08 PM
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You must have entered something incorrectly, export the file and attach it to a post. Please include the TSP's for the driver you are using.

Regards,
Dan
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Old 11-16-2011, 07:58 PM
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NEO Dan,
Here is an example

ID=28.00
Ang=1.0 x Pi
Eg=2.83
Rg=0.00
Fta=-1.44
S1=50.00
S2=18.00
Con=15.00
F12=0.00
S2=18.00
S3=125.00
Con=310.00
F23=0.00
S3=125.00
S4=96.00
Con=31.00
F34=0.00
S4=0.00
S5=0.00
L45=0.00
F45=0.00
Sd=100.00
Bl=9.70
Cms=1.98E-04
Rms=1.97
Mmd=52.27
Le=3.17
Re=3.51
TH=1
Vrc=0.00
Lrc=0.00
Ap1=0.00
Lpt=0.00
Vtc=0.00
Atc=0.00
Pmax=100
Xmax=5.0
Comment=Bumper 640X

 

bumper64.txt 0.3876953125k . file
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Old 01-30-2013, 01:30 AM - Thread Starter
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Well boredom set in during these winter months so I figured I would add 2 more of the Volvotreter 38hz TH's to my existing 2. Just my 13'x13' office that I spend lots of time in, really no need to add 2 more other than boredom and why the hell not. Plus it just looks cool....

I do not know if the orientation is final, I may flip the horns and couple the mouths together. Need to take measurements and see what comes out better. Definitely LOUD though!







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Old 01-30-2013, 06:06 AM
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Looks good and I do want to see those measurements. Do you still have your THT? Did you ever take measurements on it?

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Old 01-30-2013, 08:10 AM - Thread Starter
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yeah i still have the THT unforunately. i got listening position and groudplane I believe somewhere. let me try to dig them up. i do have groudplane measurements of this horn as well is that what you were thinking or listening position?
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Old 01-30-2013, 09:04 AM
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both if you have them. biggrin.gif I want to compaire them to mine.

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