Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
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 5th July 2020, 12:48 PM   #241
wilbur-x is offline wilbur-x  Norway
diyAudio Member
 
Join Date: Dec 2005
Would there be any disadvantage to use my RAAL-Seos together with PTT6.5 ?
A 3-way with PTT6.5 in OB plus a CSS 12" in a closed box together with KlaraT is a tempting idea.
Attached Images
File Type: jpg seosraal.jpg (23.8 KB, 454 views)

Last edited by wilbur-x; 5th July 2020 at 12:58 PM.
  Reply With Quote
Old 5th July 2020, 01:02 PM   #242
dewdrop is offline dewdrop  Singapore
diyAudio Member
 
Join Date: Mar 2004
X,
So what if we use the reference design, i.e. AMT tweet in your TL configuration?
  Reply With Quote
Old 5th July 2020, 01:12 PM   #243
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
AMT should be fine - the TL simply replaces the passive radiator alignment. It’s debatable to some people but IMO, a TL sounds superior to either BR or passive radiators.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 5th July 2020, 01:19 PM   #244
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
Quote:
Originally Posted by wesayso View Post
He cannot sleep, he still has to finish the Keantoken amp .
The parts for the AurumX amp Front End (FE) are here but a man’s got to know his limitations. I need at least 3 hrs sleep.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 5th July 2020, 08:55 PM   #245
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
I made a new thread for the RAAL and PTT6.5 here:
RAAL 70-20xr and PTT6.5 Compact TL

I also found that a simple change to R2 and C1 and moving tweeter back 2.1in gives a simple Harsch XO:
RAAL 70-20xr and PTT6.5 Compact TL-raal-70-20xr-tt6-5-xo2-harsch-screenshot-v002-jpg
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 11th July 2020, 01:37 AM   #246
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
Lock miter box edges completed finally. We were down for a few days since my cabinet makerís AC went out and needed to be replaced before he could start.

Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide-32e1bc1b-5b3a-4f62-bb44-8757cc92e619-jpeg
Attached Images
File Type: jpeg 32E1BC1B-5B3A-4F62-BB44-8757CC92E619.jpeg (748.1 KB, 354 views)
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 14th July 2020, 09:07 AM   #247
deerhunt is offline deerhunt  Sweden
diyAudio Member
 
Join Date: Feb 2004
Location: sweden
After playing with the speaker for a while the signature of the Ptt6 is starting to show.
My findings are that the bass is deep! Perhaps too deep, which on some material shows as “slow”. This makes me consider if the low tuning of 26Hz is a good choice? The fs of driver is 30Hz.

An example of music which gives too much uncontrolled bass in my system is Carolin No, Still Water Runs Deep.

What do you think about cutting the first internal wall halfway (or all of it). It will raise tuning and give the driver more space to breathe.

Beside this, the overall performance is splendid. Being able to play very loud without any noticeable distortion.
__________________
deerhunt

Last edited by deerhunt; 14th July 2020 at 09:30 AM.
  Reply With Quote
Old 14th July 2020, 12:32 PM   #248
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
The TL length and simulation says system frequency should be about 32Hz to 36Hz. I am not sure how it managed to get so low based on impedance measurements. If you get rid of 1st wall it might turn it into a bass reflex with a very long vent. Try adding a bit of loose stuffing (2g to 3g not much) in the final passage before the horizontal exit vent. The sim says this part should have some damping to control the low bass. It will reduce and flatten output thereby raising the fb. It will reduce group delay to prevent the “slow” bass. It’s very sensitive to damping here - changes character of the sound greatly.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 14th July 2020, 01:13 PM   #249
zman01 is offline zman01  Bangladesh
diyAudio Member
 
Join Date: Feb 2011
Location: Dhaka
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
Hi X,

IIRC deerhunt had a slightly wider cabinet vs your design (link of his post below) - is this internal width (so actually internal volume)? Might that be contributing to the "extra low" tuning that he is experiencing?

Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
  Reply With Quote
Old 14th July 2020, 02:36 PM   #250
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
Hi Zman,
I think Deerhunt said his internal dimensions were the same but the baffle is 2cm wider, if I read it correctly. But if the internal width was 2cm wider, that would make for a larger volume cabinent and lower the tuning frequency, Fb. I am thinking it might be the eggrate foam along the channels as decreasing the channel CSA, effectively making the TL thinner and lowering the Fb. The simulation does have a damping factor applied in these channels to simulate loose stuffing, but that may not be capturing the effect of the eggcrate effectively. I am thinking maybe I should try not having eggcrate foam on the thinner channels after the main chamber. Replace with very loose wispy polyfill stuffing in those channels.

This is one of the things that making a foam core pathfinder/verification build would have been useful.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote

Reply


Simple Passive Harsch XO Using PTT6.5 and RS28F in a WaveguideHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
S. Harsch XO xrk971 Multi-Way 763 Yesterday 02:43 PM
WTB: Purifi's PTT6.5W04-01A Studley Swap Meet 4 6th May 2020 12:29 PM
Orthoacoustic simple two way Unity corner waveguide Circlomanen Multi-Way 13 2nd April 2019 07:42 AM
Active or passive 8" + waveguide? LJNorth Multi-Way 4 12th January 2013 02:23 PM
Simple DIYable Waveguide testing (dome tweeters) dlneubec Multi-Way 3 14th October 2008 04:10 PM


New To Site? Need Help?

All times are GMT. The time now is 04:02 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki