Author Topic: Speaker level to line level converter box  (Read 5657 times)

Offline rgpit

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Speaker level to line level converter box
« on: January 25, 2010, 09:27:12 PM »
This is really a daughter project to my cylinder sub woofers project.

My integrated amp doesn't have a preamp output so I need to make a speaker level to line level converter box. I have been told that this is actually a preferred way to add a sub as opposed to using a preamp output. I don't know if that is true or if it really matters but what the hell!

Bought the following parts from Parts Express.
 2 chassis mount RCA jacks
 2 Dual 5-way binding posts
 2 10k Ohm 1Watt resistors
 2 1k Ohm 1Watt resistors
 1 small steel enclosure with rubber feet

That's it,short and sweet. I'll post a couple of pictures when it's built.

Ron
« Last Edit: January 27, 2010, 08:22:12 PM by rgpit »
Primary System: Pioneer PLX-1000 with Nagaoka MP-150, Sony XDR-F1HD, Tascam CD200 transport, Squeezebox Touch, Benchmark DAC2 HGC, Prima Luna Dialog Two, Analog Research Velluto, Harbeth Compact 7ES-3, Elac 10" subs, Alesis Masterlink ML9600 master disc recorder

Offline MasterBlaster

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Re: Speaker level to line level converter box
« Reply #1 on: January 25, 2010, 10:45:24 PM »
cool, look forward to it Ron.

Whats the power output of your receiver btw?
HT: Audiocontrol Maestro M3, Sunfire 5*200,  Tannoy Mercury MX , SVS PB-12 Sub

Head-Fi: FUBAR IV Plus DAC, Grado SR225

Living Room: Dynaco ST-70 (R&R work done by NATOE), Dynaco PAS Preamp, Jamo C607 towers, MCS 6710 Turntable

Offline rgpit

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Re: Speaker level to line level converter box
« Reply #2 on: January 26, 2010, 09:47:38 AM »
Main Speakers are powered by a 38Wpc KT88 based tube amp. PrimaLuna Dialgue Two
Primary System: Pioneer PLX-1000 with Nagaoka MP-150, Sony XDR-F1HD, Tascam CD200 transport, Squeezebox Touch, Benchmark DAC2 HGC, Prima Luna Dialog Two, Analog Research Velluto, Harbeth Compact 7ES-3, Elac 10" subs, Alesis Masterlink ML9600 master disc recorder

Offline rgpit

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Re: Speaker level to line level converter box
« Reply #3 on: January 27, 2010, 05:36:37 PM »
Here is the finished converter. Nuthin' special, but it works.

Primary System: Pioneer PLX-1000 with Nagaoka MP-150, Sony XDR-F1HD, Tascam CD200 transport, Squeezebox Touch, Benchmark DAC2 HGC, Prima Luna Dialog Two, Analog Research Velluto, Harbeth Compact 7ES-3, Elac 10" subs, Alesis Masterlink ML9600 master disc recorder

Offline BrianT

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Re: Speaker level to line level converter box
« Reply #4 on: January 27, 2010, 05:52:28 PM »
Here is the finished converter. Nuthin' special, but it works.



Looks good
Devialet D400 - Audioprana SP/DIF-AES/EBU cable
VPI Classic TurnTable (blk)
c/w Transfiguration Phoenix Cartridge
Raysonic 168 CDP
Mac Mini Music Server c/w Audioquest Diamond USB cable
B&W 803D3 (black) Auditorium 23 Cables

Offline BB3

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Re: Speaker level to line level converter box
« Reply #5 on: January 27, 2010, 06:26:55 PM »
Jesus Christ Ron Is That Impressive. I Sure Wish That I Had Your Knowledge And Skills.

Excellent Work Ron. Oh ! And Did I Mention How Impressive It Is ???? WOW !

Take Care Ron.---------BILL(BB3)
Carver Gear : C-9, C-16, C-19, 4-TFM 55's, 2-TFM 35's, 1-TFM 25, 2- Silver 7T's, 490T

Non Carver Gear : Anthem AVM50V, Anthem PRE2L, Sonic Frontiers SFCD-1, Denon DCD1560, Sony PS3 & BDP-350, Nin.Wii
 
Speakers : Polk Audio--SDA-SRS, SDA-SRS1.2TL's, SDA-CRS+'s, RTA-15TL's and 3-Velodyne F-1500

Offline Kingman

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Re: Speaker level to line level converter box
« Reply #6 on: January 27, 2010, 07:40:51 PM »
Is this a version of the Carver Z-1 coupler???
IN REALITY IT ONLY MATTERS WHAT IT SOUNDS LIKE TO YOU!!!!!

Offline rgpit

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Re: Speaker level to line level converter box
« Reply #7 on: January 27, 2010, 08:13:35 PM »
Is this a version of the Carver Z-1 coupler???

Not sure what the Z-1 is. Here is the circuit that I used. It is a simple 10:1 voltage divider circuit.

« Last Edit: January 27, 2010, 08:16:21 PM by rgpit »
Primary System: Pioneer PLX-1000 with Nagaoka MP-150, Sony XDR-F1HD, Tascam CD200 transport, Squeezebox Touch, Benchmark DAC2 HGC, Prima Luna Dialog Two, Analog Research Velluto, Harbeth Compact 7ES-3, Elac 10" subs, Alesis Masterlink ML9600 master disc recorder

Offline MasterBlaster

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Re: Speaker level to line level converter box
« Reply #8 on: January 27, 2010, 08:19:14 PM »
Ron,

Just curious...
The schematic calls for 10k and 1k resistors.
Why'd you use 100k and 10k?

I would expect that would seriously lower the output levels.

/Al
HT: Audiocontrol Maestro M3, Sunfire 5*200,  Tannoy Mercury MX , SVS PB-12 Sub

Head-Fi: FUBAR IV Plus DAC, Grado SR225

Living Room: Dynaco ST-70 (R&R work done by NATOE), Dynaco PAS Preamp, Jamo C607 towers, MCS 6710 Turntable

Offline rgpit

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Re: Speaker level to line level converter box
« Reply #9 on: January 27, 2010, 08:27:18 PM »
Ron,

Just curious...
The schematic calls for 10k and 1k resistors.
Why'd you use 100k and 10k?

I would expect that would seriously lower the output levels.

/Al

Oops!...good eye Al. That was a typo. I actually used 10k and 1k.  (I edited the original post and put in the correct values)
Primary System: Pioneer PLX-1000 with Nagaoka MP-150, Sony XDR-F1HD, Tascam CD200 transport, Squeezebox Touch, Benchmark DAC2 HGC, Prima Luna Dialog Two, Analog Research Velluto, Harbeth Compact 7ES-3, Elac 10" subs, Alesis Masterlink ML9600 master disc recorder