babadono

philly, Have you had a chance to try it yet? babadono

philly, Yes that's correct. I think it's worth a try. babadono

philly, Also if you had sound when the preamp out was jumpered to the amp in on the Marantz then there is nothing wrong with the pre out on the Marantz. babadono

Hi philly0116, I'm thinking if there is no 'bridge/normal' switch you will have to feed the left preamp output to both inputs 1 and 2. Likewise the right preamp output to both inputs 3 and 4. Then the left loudspeaker hooks up between output 1 (+) and output 2(-) and the right speaker between output 3 (+) and output 4 (-) but babadono

I luv the check mark on the autoformer/inductor of the original crossover. Musta passed test.[]

DizRotus, Maybe I am reading too much into what the OP wrote. I assumed: #1 It is a powered sub. #2 It has been unplugged for quite some time, at least long enough to get to Mom's house and have the dog chew off the power cord. #3 The sub has a speaker in it that is presenting a load to the internal amp. If all this is correct the capacitors in the unit are discharged. I did not intend to offend anyone in anyway. Btw How's life in Birmingham? I'm originally from Royal Oak. babadono

Tasdom, At $3k a piece in cherry veneer should I get 3 or 4 ? HAHAHAHAHA babadono

BlueBomber13, So did you get it fixed? BTW I'm raising the [bs] flag on getting shocked. If you unplug it from the wall you will not get shocked, just like the dog didn't. babadono

Richard, My speculation is there is not much below 40 Hz in the source you are listening to. Try it with a signal generator. Or with the gain turned way down on the amp going to the Danley's try increasing the the freq of the lowpass filter (temporarily) to see if the second DX38 then has more signal output. babadono

tswei, The meter will be used to test if the voice coil is intact. Set the meter to the lowest resistance (ohms) scale. I don't know the exact reading you should get but probably betweeen 4 and 8 ohms. The speaker needs to be disconnected from the crossover to make this measurement. If the voice coil reads open circuit the speaker is 'blown' as they say. This is not the only thing that can be wrong with cone speakers. The cone can be torn or seperated from the metal surround hence as you may have heard of a speaker being 'reconed'. I hope this helps. I also have a pair of circa mid 70's LaScalas and my woofers are still alive and well. babadono

Are these the ones with the adapters so they go straight onto a K 402. No muss, no fuss? I would think that would be a selling point.

WMcD, I was trying to be funny. The schematic shows both ends of these caps attached to ground. Now either the schematic was drawn in error or these caps do nothing. babadono

djk, I loooked at the schematics on line for this and you are correct. My hat's off to you. BTW what are the .01 caps C235,C236 at the input that are tied from ground to ground doing? RickTate, Are you up to digging into this and fixing it?

Ah.......take it to someone who does? I dunno that's just a guess. Is there anyone close to RickTate that can help him out? RickTate, Can you get any suppoort from MacIntosh? babadono

djk and ricktate, Wow really? I would want to put a signal generator and oscilloscope on that Mac before I started replacing parts in a Mac. Hey but that's just me. I am an electronic engineer. babadono

RickTate, I don't even see any subwoofer output on the unit Dave linked the data sheet of. If this is your unit then definitely the main pre outs should have the full range signal. Do you know what the input impedance of the Mac is? It should be high compared to the output impedance of the AVR pre outs but perhaps the output coupling capacitors are too small in value or they have degraded with age. This is all speculation on my part. Do the pre outs sound OK when coupled into the internal amp of the AVR? babadono

RickTate, I could be way off here but I think Carl meant the bass is being redirected to the SUBWOOFER output and taken out of the main pre outputs if the mains are set to small. babadono

Hey! Look around. This whole place is made out of rock.

BentMike, So when you are using the battery powered player there is no AC to get coupled/induced/ground looped into the powered speakers. When you are using the player is it with the same cable? From your earlier posts I think it is a different cable. Turn off the speakers. Take the cable that you are using with the computer and unplug it from the computer. Leave the speaker end hooked up. With the speakers off, short what you think is the ground contact to the two signal contacts on the plug that normally goes into the computer. Turn the speakers on. Is there no hum when you do this? If there is no hum when you do this but as soon as you plug it into the computer you get hum you will need one of those gizmos that DJK suggested. Sometimes that is the only thing that will fix this. babadono

BentMike, Just FYI. Those caps may not physically be there. It could be parasitic capacitance of the transformer or other parts of the circuit. Much good information about these types of issues can be found at the Jensen Transformer website. Checkout their app. notes and white papers. babadono

Dr Who, Where did the OP go? Did we scare him off? Bent Mike, Is your problem fixed? babadono

BentMike, OK good so you are using the unbalanced inputs. Do you have a 1/4 phone plug that you can short the tip to the sleeve on? Plug this into the input of each speaker, this effectively makes the input to the speaker it own ground(No signal). Is the hum gone?(Or at an acceptable level?) On both speakers? If yes both speakers are good. If one of the speakers is quiet but the other is not the problem is in that speaker(or amp or power supply since this is a self powered unit). This is the first step. You must determine if the two speakers are good. Just curious does the IEC power input connector have 2 or 3 contacts? If 3 does the ground contact tie to the 1/4 phone jack sleeve? babadono

BentMike, Duh, nevermind about if you have a meter, I re read your post. I am trying to gain a little info about the speakers. What model are they? Looks like some have seperate balanced and unbalanced inputs and on others they tried to do both with the same input jack. babadono

BentMike, Hmmm..... Do you have a volt/ohm meter to go along with your scope? When you say 1/4in jack you mean a phone jack correct? Is the input to the speaker a 1/4 jack? And you are plugging in a 1/4 plug correct? Is the speaker input jack tip/sleeve or tip/ring/sleeve? babadono

Cool! I will PM you. BTW awesome job on the HT. Enjoy! babadono