Introducing: the PET (SS 8545K + BG Neo3 PDR) - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 1st November 2008, 06:12 PM   #1
diyAudio Member
 
Join Date: Apr 2007
Location: Chicagoland
Default Introducing: the PET (SS 8545K + BG Neo3 PDR)

I have been posting a bit about this on the PE board, but I wanted to share it with the international community here as well.

As you can tell, the cabinet design was "borrowed" from a famous hi fi speaker manufacturer (hint: they are a very "tribal" company). But I thought the slim, relatively small cabinet would have good SAF. It also was a good size to try out a bunch of other floorstanding 2-ways I've always wanted to hear (hence the removable baffle)

A quick add-up of the parts puts these at $500, which is a bit pricey. But put these drivers in a boutique hi fi speaker and well, you know the rest.... It occurred to me while adding up the parts that I have a lot of strange values in the XO. If anyone is serious about building these, drop me a line and we'll find the correct substitutions.

I'm out of adjectives and flowery language to describe my speakers. All I can say is that these are just REALLY good, and they're about all I could ask from a monopolar, 2-channel, 2-way, critical listening experience in my living room.

Crossover here: http://undefinition.googlepages.com/PETdiagram.gif

Frequency Response and Impedance: http://undefinition.googlepages.com/....2FRandImp.gif

Cabinet = 8"W x 11"D x 34"H. (Shelved at bottom to create 22 Liters.) Vented, tuned to 40 Hz; F3 @ 35 Hz.
Click the image to open in full size.
__________________
-Paul Carmody
https://sites.google.com/site/undefinition/diy
  Reply With Quote
Old 1st November 2008, 07:02 PM   #2
blue934 is offline blue934  Canada
diyAudio Member
 
blue934's Avatar
 
Join Date: Mar 2007
Location: Salmon Arm, B.C.
how does this compare to your vic-20? some minor changes in LP, does the midrange compare/differ to the older xover?
looks great! the ss has been used so may times i need to fork out and try it in a proven design.

blue934
  Reply With Quote
Old 2nd November 2008, 05:39 AM   #3
diyAudio Member
 
Join Date: Apr 2007
Location: Chicagoland
Quote:
Originally posted by blue934
how does this compare to your vic-20? some minor changes in LP, does the midrange compare/differ to the older xover?
The VIC-20 are voiced a bit flatter--probably best-suited for jazz and classical enthusiasts. The PET are pretty reliable for all styles of music... now that I'm thinking of it, they sort of remind me of the way Jeff Bagby voices his 2-ways.

Anyway, in regards to the 8545K, it's not exactly an easy driver to work with (then again, neither is the DC160)... but I'm finding it more cooperative the longer I tweak it. And boy, once you get it under control, it can really put on a show!
__________________
-Paul Carmody
https://sites.google.com/site/undefinition/diy
  Reply With Quote
Old 2nd November 2008, 09:14 PM   #4
diyAudio Member
 
Join Date: May 2004
Location: Sydney
Thanks for sharing.

I see a notch filter in the woofer circuit. Would you mind telling me what that is for?

Regards,
Bill
  Reply With Quote
Old 3rd November 2008, 04:20 PM   #5
diyAudio Member
 
Join Date: Apr 2007
Location: Chicagoland
Quote:
Originally posted by HiFiNutNut
I see a notch filter in the woofer circuit. Would you mind telling me what that is for?
[/B]
That particular "pulpy paper" cone has a bump between 800-900 Hz. it's not huge, but unless you tame it, the speaker will sound somewhat "boxy," which is not really something you want when you've just shelled out $160 per driver. If you look at the other DIY designs that use the 18w\8545, you'll see they all have some sort of series RLC shunt filter to mellow the peak out.

As for the commercial speakers that use that midwoofer (ie: WATT/puppy), I don't honestly know if they notch it as well, but I'd hope so. Once you do that bit of EQ on this woofer, it really puts out an excellent sound.
__________________
-Paul Carmody
https://sites.google.com/site/undefinition/diy
  Reply With Quote
Old 4th November 2008, 02:28 AM   #6
diyAudio Member
 
Join Date: May 2004
Location: Sydney
Thanks for your note.

I use 18W8545 not 18W8545K so I don't know that problem. The 18W8545 (without the K) does not seem to have that problem.

It is a very good driver from 100Hz to 1.5kHz. But at 3kHz the 18W8545 does not sound smooth. I use high order at around 2kHz and it seems OK.

Regards,
Bill
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB Scan 18W/8545K pair johnmark Swap Meet 0 16th October 2008 06:37 PM
WTB: Scan Speak 18W/8535, 18W/8545, or 18W/8545K omarmipi Swap Meet 3 26th April 2008 06:48 PM
Focal 6v4211 vs Scanspeak 18W/8545K goolan Multi-Way 0 17th January 2007 06:24 PM
Design for Scan Speak Revelator + 8545k TEK Multi-Way 17 29th April 2005 03:35 AM
R2 SS 8545K X-over Richard Moon Multi-Way 9 14th May 2002 01:30 AM


New To Site? Need Help?

All times are GMT. The time now is 10:44 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