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MT121 top end ideas? |
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studio45 
Old Croc 
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3881 |
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 Posted: 31 July 2008 at 6:52pm |
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right i've bashed something together. Just tested it for 1st time now. I'm a happy man though it's not there yet :)
the small upper mid horn: 
Based on dimensions of Limmer 042 6" section, with dressed polyester filler compound in the corners a la MX600. Didn't even take that long. witness the ruffness 
The front of the cab as it is now. The piezo horn isn't staying, but crossed in at 7k, actually isn't bad at all. 
The full stack, including 184Sub. 
No drastic gaps in frequency response i can hear...Have yet to measure it. Driver list: (dons asbestos jumper) Sub PD184 18" Mid bass Skytronic 902.442 12" Hi mid Maplin 55w 6.5" "Shielded Bass/Mid Woofer" Tweeter Maplin wide dispersion piezo horn Yeah yeah they're not what you'd want but they're what i've got :) Amps: Sub: CAudio Pulse 650 (650w @ 4r) Mid bass/ hi mid: Crest 4000 (300w @ 8r) Tweeter: Arcam Alpha (30w @ 8r) Crossing at 120hz, 500hz and 7kHz actively with delay and EQ using mi laptop and a clever bit of software, i can achieve a fair level of crispness. That's where i'm at with it....more progress to come...firstly getting a good 1" instead of that piezo :) |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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colinmono
Young Croc 
Joined: 10 October 2007 Location: Midlands UK Status: Offline Points: 1113 |
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Posted: 31 July 2008 at 7:16pm |
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Looks great, that's some proper diy horn skills you've got going there
 . I reckon Tony will be proud of you if he sees this!
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sKs01
Old Croc
Joined: 11 April 2008 Location: sheffield Status: Offline Points: 1744 |
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Posted: 31 July 2008 at 7:25pm |
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looks verry nice well done boss
 i wouldve thaught you could fit that 6" horn in if you put it through 90 degreese though what the dispersion would be like i would think that would be a prime location for a 1" or a couple of bullets maybe.... or bullets either side Edited by sKs01 - 31 July 2008 at 7:27pm |
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You're a big man, but you're in bad shape. With me it's a full time job. Now behave yourself.
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3881 |
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Posted: 01 August 2008 at 12:26am |
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u mean put the 6" horn inside the 12"? With the back box on it, it wouldn't fit. With a sealed 6 it could be done. Tomorrow i'm burn testing the maplin hi mid to find out what 55 watts full range reflex means between 500 and 7k sealed box...it's got a 300watt amp on it
 Also don't think it's really got the power between about 2k and 7k, but measurements will tell. Shame it pissed it down today or i'd have had it out in the street for a better listen but had to make do with 15ftx15ft workshop 
Seriously though the 902.442 is a beefy beefy driver, don't think i'm gonna be blowing that before it's far too loud. Got 8 inch magnet, 4 inch voicecoil, kapton former, vented pole. Big fecking lump of steel :) ANyone used these? As cheap replacements in DJ monitors i bet
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3881 |
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Posted: 04 August 2008 at 6:54pm |
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I have plots...Red trace is mic, green trace is reference
With pink noise 
With music program (some old school dub): 
The measurement setup: 
That's a Behringer ECM8000 measurement mic, a metre from the cab, in a totally acoustically untreated room (workshop). Dunno how this will affect readings. But it sounds pretty good once I'd used the measurements to adjust a GEQ in the processing software to get it flatter. But then , to me, it would :) SKS, come down and have a listen. Got no indoor room here big enough, and I feel like a twat stood in the street on me own blasting rave tunes :) |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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sKs01
Old Croc
Joined: 11 April 2008 Location: sheffield Status: Offline Points: 1744 |
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Posted: 04 August 2008 at 7:00pm |
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sounds like a plan, though i might have to bring some of my own tunes down to compare what its like to the pezio's and tens in my room, ill be building es18's most of this week and got a gig on friday at ethiocubano should be able to find sometime to come over what area of sheffield are you in?
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You're a big man, but you're in bad shape. With me it's a full time job. Now behave yourself.
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Deadbeat
Old Croc
Joined: 12 March 2008 Location: Singularity Status: Offline Points: 3167 |
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Posted: 04 August 2008 at 7:05pm |
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'sealed back'
I'd throw a pair of old LA6 CBMRs over to you (Emi), but that defies the standard model on several counts. But seriously, they're cheap and effective, as good as the Alpha 8MR imo. Great stuff, those mids look the business. I like your transition from circle to square! |
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Away on extended leave.
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3881 |
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Posted: 06 August 2008 at 1:52am |
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Yeah can't seem to find them easily,only the 8" version, but i've just ordered another 902.442 and 2x 6.5" 902.423's (skytronic don't do model names
) which are cheap as chips and do 125w rms with 90db sensetivity, now i just need something in a 1" almost as good as a de250 for less money. or more piezo's :)
Had to almost disassemble the cab to day to put in nut sleeves where i'd used woodscrews on the drivers. I'll be putting them in earlier next time :) |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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Deadbeat
Old Croc
Joined: 12 March 2008 Location: Singularity Status: Offline Points: 3167 |
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Posted: 06 August 2008 at 4:36am |
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Celestion CDX-1745 is my standard budget 1" that still sounds good reccomendation.
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Away on extended leave.
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3881 |
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Posted: 17 August 2008 at 12:49pm |
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Got two of those now, but CPC sez Celestion don't make the horns for 'em any more. B+C ME10 a good substitute?
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3881 |
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Posted: 17 August 2008 at 12:52pm |
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these? Getting them anyway...
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=330261293496&ssPageName=STRK:MEBI:IT&ih=014 Edited by studio45 - 17 August 2008 at 12:53pm |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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sKs01
Old Croc
Joined: 11 April 2008 Location: sheffield Status: Offline Points: 1744 |
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Posted: 18 August 2008 at 8:12pm |
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for the drivers that are in them they do sound verry nice, definatley anticipating next weekend those 184 bandpass subs should complete the package niceley.
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You're a big man, but you're in bad shape. With me it's a full time job. Now behave yourself.
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