Collaborative Tapped horn project - Page 10 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd March 2007, 11:03 AM   #91
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Quote:
Originally posted by paulspencer
One more thought. In the Danley version, does anyone know how the driver is actually mounted? It has an access panel in the middle - could it be that the driver is actually in there?
I assume you have seen this thread?
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 23rd March 2007, 04:14 PM   #92
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

As TD states and shows in an excursion plot sim in his Tapped Horn WP, there's actually less gain at tuning than in a BR, only the gain due to pipe loading, so yes, you're 'robbing Peter to pay Paul', but it's a good one for a prosound sound app if the TP is tuned low since they're only really interested in the ~60 Hz - up BW and particularly in the ~80 Hz - up BW. For a typical music/HT app, the TP makes no sense to me since it's going to be XO'd <80 Hz and typical high excursion drivers combined with relatively cheap mega power in simple pipe horns can damage houses at low distortion levels, not to mention these can easily be ~accurately simmed using any TL or BLH software.

WRT the TOP's SQ, as I noted, until proven otherwise, I believe it was all the other horn loaded cabs in close proximity 'singing along'. WRT PB's opinion, I've auditioned 8th order BPs (Karlson K-15) that if BW limited and combined with mids/HF compression horns (Altec 805 multi-cell/288 driver in this case) was heart attack 'fast' enough to make you believe you were standing next to a Nick Mason drum solo, so IMO it's dependent more on the design/implementation than the number of orders of resonance.

As always though, YMMV.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 23rd March 2007, 05:17 PM   #93
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Quote:
Originally posted by GM
... was heart attack 'fast' enough to make you believe you were standing next to a Nick Mason drum solo...
Been there, had the t-shirt, (last seen polishing the car). He's actually fairly quiet as drummers go...
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 23rd March 2007, 07:17 PM   #94
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

True, but I can't remember the names of any of the heavy metal band's drummers. Regardless, it takes a pretty serious wide BW HE system to reproduce any drum set solo at ~accurately at ~live levels.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 23rd March 2007, 08:37 PM   #95
diyAudio Member
 
Join Date: Jan 2006
Location: Mobile, Al.
Try Joe Morello.

Ray
  Reply With Quote
Old 23rd March 2007, 08:52 PM   #96
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Nah, he's a wuss. Now this guy is loud...
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 23rd March 2007, 09:01 PM   #97
diyAudio Member
 
Join Date: Jan 2006
Location: Mobile, Al.
Agreed.....I was going for precision rather than volume.

Ace of Spades...this guy is a beast!!!
  Reply With Quote
Old 24th March 2007, 04:22 AM   #98
diyAudio Member
 
Join Date: Dec 2002
Location: dry ol Melbourne Australia
Default BP/ Karlson etc

GM

Seems to me for music like Nick Mason etc, 80 - 400 Hz is most critical.

I’ve considered and dropped Onkens, am deferring bass horns till I have more time & skill, and thinking of a simple vented mid bass 15”. I have a pair of JBL 2035HPL’s with Fs 43 Hz, 7 mm Xmax, low Le of 0.25, BL of 17 etc. (I don’t seek to get to live levels, say 105-110 dB will do) ~ not Altecs, but within my budget.

Other than horns, in your opinion would a Karlson or some other rig do transients/ drums any better than a good driver in a good vented box?

Cheers
  Reply With Quote
Old 24th March 2007, 08:01 PM   #99
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Default Re: BP/ Karlson etc

Greets!

Freddy and a few others don't mind XOing Ks as high as 500 Hz, but going from a near 50 yr distant memory, I do, so something like what RCA-fan calls a 1/2 horn seems a reasonable solution, though I prefer the better damped ~max flat impedance TL variant.

Got the rest of the HPL's specs?

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 25th March 2007, 02:34 AM   #100
diyAudio Member
 
Join Date: Dec 2002
Location: dry ol Melbourne Australia
Hi GM

I thought a concern of all or most Ks, is a peak at c. 200 Hz, often about 2 dB. Guess it might be notched out, but maybe it’s only the peak giving an illusion of better transient response?

A constraint, and a workaround: I don't want a box bigger than about 70 L (2.5 cubic ft), *but I will use an active “sub” underneath which goes deep, crossing about 60 – 80 Hz

The tapped horn or a TL would be an alternative to the sub.
I apologize for digressing to the next ~3 octaves above what a TH can cover.

The HPL's specs are:
Fs 43
Re 4.7
Qms 4.9
Qes 0.36
Sd 880 cm2
Vas 192 L (6.8 cubic ft)
Xmax 7.0 mm (0.28”)
Le 0.25

With the low Le, I had one steam of thought that the 2035 could be used even to say 1200 Hz without too much distortion(?), avoiding the need for a mid driver. The idea of avoiding a mid driver is one less crossover, less induction losses, and allow a sweet low powered amp (Gordon Rankin’s 2 watt 45 SE Bugle).

Now beginning to think that’s the horse driving the cart: I should use a mid (have some good candidates of similar efficiency) and only need to take the mid bass up to eg 300-400 Hz, ie the piston range of a 15".

Rather than depth, I was asking after optimizing midbass –lower mid transient response & impact. Maybe within those parameters it comes down to the quality of the driver and the box construction?

Thanks
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 02:57 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2