Home |
Search |
Today's Posts |
#1
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
I just came across a pair of HPM-100's at an estate sale for $50. While
I knew they were going to be a part of the estate sale, I didn't get a chance to check their conditiion prior to sale.... So for fear of losing them to the "next guy", I snapped them up!. I got them home, hooked them up and it appears every driver is blown except the woofers... Yes I can live with that because I was probably going to replace all drivers anyway since every dust cap is pushed in, plus the drivers seem reasonable on ebay. The cabinets look great which gives me the green light to go ahead with the project. My question is, how can I be certain the crossovers are fine? I thought since all drivers were blown except woofers, that maybe the crossovers were trashed as well, but it seems the pots were just dirty and they are now outputting sound. But how can I be sure the crossovers are 100% before I start the process of acquiring replacement drivers? I remember when these guys were new "back in the day" but I was just a kid with no money. I wish they were in better condition but I love projects.......especially audio projects! |
#2
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
|
#3
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
GregS spake thus:
In article .com, wrote: I just came across a pair of HPM-100's at an estate sale for $50. While I knew they were going to be a part of the estate sale, I didn't get a chance to check their conditiion prior to sale.... So for fear of losing them to the "next guy", I snapped them up!. I got them home, hooked them up and it appears every driver is blown except the woofers... I would also recommend soldering all connections. Pots can be troublesome. I personally like to switch to fixed resistors once proper levels are found. Or just do as I did and get rid of 'em altogether. My pair of AR-2s that I got dirt cheap had ruined rheostats (not pots, just 2 connections), so I just hard-wired them at the "full-on" setting. (That's what tone controls on the amp are for!) -- Any system of knowledge that is capable of listing films in order of use of the word "****" is incapable of writing a good summary and analysis of the Philippine-American War. And vice-versa. This is an inviolable rule. - Matthew White, referring to Wikipedia on his WikiWatch site (http://users.erols.com/mwhite28/wikiwoo.htm) |
#4
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
wrote in message oups.com... I just came across a pair of HPM-100's at an estate sale for $50. While I knew they were going to be a part of the estate sale, I didn't get a chance to check their conditiion prior to sale.... So for fear of losing them to the "next guy", I snapped them up!. I got them home, hooked them up and it appears every driver is blown except the woofers... Yes I can live with that because I was probably going to replace all drivers anyway since every dust cap is pushed in, plus the drivers seem reasonable on ebay. The cabinets look great which gives me the green light to go ahead with the project. My question is, how can I be certain the crossovers are fine? I thought since all drivers were blown except woofers, that maybe the crossovers were trashed as well, but it seems the pots were just dirty and they are now outputting sound. But how can I be sure the crossovers are 100% before I start the process of acquiring replacement drivers? I remember when these guys were new "back in the day" but I was just a kid with no money. I wish they were in better condition but I love projects.......especially audio projects! **It doesn't matter if the crossovers are OK, or not. Unless the replacement drivers are absolutely IDENTICAL, the crossovers will be pretty much useless anyway. -- Trevor Wilson www.rageaudio.com.au -- Posted via a free Usenet account from http://www.teranews.com |
#5
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
I am having a heck of a time cleaning the pots, there doesn't seem to
be any openings to shoot contact cleaner in... And it seems very difficult to remove the pots assembly from the front baffle. Is there a way of cleaning these without removing the assembly? (They are mounted on a plastic plate stapled to the front baffle!) An alternative would be to bypass them....(I never use these anyway and keep a flat setting...) Is the output from the crossover to the pots a flat setting anyway, so i could bypass? I wanted to do a 100% restoration on these and would like them to be functional, but... Thanks guys! |
#7
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
Okay, I have bypassed the pots! (I love heat shrink tubing!) I was
actually able to remove the back cover of the pots while they were still installed in the cabinet, but contact cleaner still wouldn't bring them back to life! My next question... A previous poster mentioned that by bypassing the pots, that this is the same as both pots at their highest setting. What value resistor could I put inline that would bring them (mid and high) to a flat value? Thanks! |
#8
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
spake thus:
Okay, I have bypassed the pots! (I love heat shrink tubing!) I was actually able to remove the back cover of the pots while they were still installed in the cabinet, but contact cleaner still wouldn't bring them back to life! My next question... A previous poster mentioned that by bypassing the pots, that this is the same as both pots at their highest setting. What value resistor could I put inline that would bring them (mid and high) to a flat value? Thanks! How about R/2, where R=resistance of pot? (At least a good starting point; use you ears.) -- Any system of knowledge that is capable of listing films in order of use of the word "****" is incapable of writing a good summary and analysis of the Philippine-American War. And vice-versa. This is an inviolable rule. - Matthew White, referring to Wikipedia on his WikiWatch site (http://users.erols.com/mwhite28/wikiwoo.htm) |
#9
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
How can I determine the ohm value of the pot? I then take that value
and divide by two for a value of the resistor? |
#10
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
spake thus:
How can I determine the ohm value of the pot? I then take that value and divide by two for a value of the resistor? Ever heard of an ohmmeter? One of the functions of a multimeter. Available everywhere, cheap. -- Any system of knowledge that is capable of listing films in order of use of the word "****" is incapable of writing a good summary and analysis of the Philippine-American War. And vice-versa. This is an inviolable rule. - Matthew White, referring to Wikipedia on his WikiWatch site (http://users.erols.com/mwhite28/wikiwoo.htm) |
#11
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
I've been reading that I cannot simply put a resistor in line to each
driver since the pots on the HPM-100 are L-Pads... It requires a resistor in parallel and in series... I'm wondering if just simply wiring in another L-Pad inside the cabinet would be easier altogether. Then I could measure the flat response of the original with an ohmeter and simply adjust the new L-Pad to match. Something like this one: http://www.partsexpress.com/pe/showd...Number=260-262 What do you guys think? |
#12
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
wrote:
I've been reading that I cannot simply put a resistor in line to each driver since the pots on the HPM-100 are L-Pads... It requires a resistor in parallel and in series... I'm wondering if just simply wiring in another L-Pad inside the cabinet would be easier altogether. Then I could measure the flat response of the original with an ohmeter and simply adjust the new L-Pad to match. Something like this one: http://www.partsexpress.com/pe/showd...Number=260-262 What do you guys think? If it's wired the way an L-pad would usually be wired (I think...) then only 2 connections are used, and the resistance would vary from near zero to the full value of the L-pad (maybe up to about 50 ohms). If I am correct about this - and others around here will be quick to let me know, I'm sure - then you could just bypass the L-pad altogether or replace it with a medium value of resistance you select according to taste. If you do replace it with a resistor, be sure to use one rated at least about 5 watts. Mark Z. |
#13
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
Hi Mark! All 3 connections are used on the original Lpad...which leads me to believe I can't just use one resistor per driver. |
#14
Posted to rec.audio.tech
|
|||
|
|||
Pioneer HPM-100 Questions
|
Reply |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Anyone NEED a Pioneer Din 1/2 sized stereo? | Car Audio | |||
PIONEER AVIC-D1 Questions | Car Audio | |||
Pioneer vs Yamaha | Audio Opinions | |||
USED AUDIO LIST | Marketplace | |||
>>>> USED AUDIO for EVERYONE <<<<< | Marketplace |