Reccomend me some 3" mids + Technical question

[heylinb4nz]

Spent the weekend sorting our all the blown \ perished speakers in my Mcintosh system, dynamatted up and sealed doors, parcel tray and installed a new 8" sub. Turns out the 3" mids were hosed and causing a terrible screeching sound on guitar twangs, I eliminated them but the vocals lack a little now.

The factory ones are 20RMS 8 Ohm, I was wondering if I could get away with some 4 ohm Boschmann ones ? or should I just hit Parts Express or Ebay and find some 8 ohm ones.

[boon]

Boschmann is kinda ****e. And yes I'd run 8 ohm or a. the amp will get kinda hot and b. the mids will see way more power than the other drivers and your response will be all over the show.

Tang Band make some nice drivers in this space that aren't too expensive - I'd be inclined to grab a couple of these and see how they go:

http://www.parts-express.com/tang-band-w3-881sj-3-cast-frame-neodymium-driver--264-812#lblProductDetails

[heylinb4nz]

 boon said:

Boschmann is kinda ****e. And yes I'd run 8 ohm or a. the amp will get kinda hot and b. the mids will see way more power than the other drivers and your response will be all over the show.

Tang Band make some nice drivers in this space that aren't too expensive - I'd be inclined to grab a couple of these and see how they go:

http://www.parts-express.com/tang-band-w3-881sj-3-cast-frame-neodymium-driver--264-812#lblProductDetails

The fact that i've eliminated the 3" mid from the setup at the moment, will this have any adverse effect on the impedance the AMP is seeing ?

Bit confusing the front setup as it has 6.5" + 3" + tweeter + tweeter...assuming it some combo of series and parallel so it works out to be 4 ohms at amp.

[boon]

Hrm I was working off the assumption that it was a channel per driver, or at the very least a channel per woofer+tweeter, which with a crossover would still make 8 ohms/channel.

If you've removed a driver that was paralleled the impedance will have gone up - which is safer, more efficient and should sound ever so slightly better (electronically)...

[heylinb4nz]

 boon said:

Hrm I was working off the assumption that it was a channel per driver, or at the very least a channel per woofer+tweeter, which with a crossover would still make 8 ohms/channel.

If you've removed a driver that was paralleled the impedance will have gone up - which is safer, more efficient and should sound ever so slightly better (electronically)...

Cant really find to much info on the Mcintosh amp, but I believe its 5 channel (4 X 30 RMS + 1 x 78RMS for sub) the sub channel is crossed over, and the all the other channels rely on passive crossover by way of a Capacitor installed into the mids and tweeters.

to get a 4 ohm load at the Amp, from 4 x 8 ohm speakers no doubt would require a combination of parallel and serial wiring ?.

[boon]

I hugely doubt it's series/parallel because if it was, and you removed one driver, at least one other driver would stop working. Plus the wiring complexity would be a pain in the arse for the manufacturer.

As I mentioned in another post, if you put an 8 ohm woofer and an 8 ohm tweeter on the same channel, but with a crossover, the amp will still see 8 ohms on that channel.

Chances are it's (8 ohm woofer plus 8 ohm tweeter on crossover = 8 ohms) and (8 ohm mid and 8 ohm tweeter on crossover = 8 ohms) in parallel, equalling 4 ohms at the amp.

[heylinb4nz]

 boon said:

I hugely doubt it's series/parallel because if it was, and you removed one driver, at least one other driver would stop working. Plus the wiring complexity would be a pain in the arse for the manufacturer.

As I mentioned in another post, if you put an 8 ohm woofer and an 8 ohm tweeter on the same channel, but with a crossover, the amp will still see 8 ohms on that channel.

Chances are it's (8 ohm woofer plus 8 ohm tweeter on crossover = 8 ohms) and (8 ohm mid and 8 ohm tweeter on crossover = 8 ohms) in parallel, equalling 4 ohms at the amp.

Ahhh yes that would make sense.

RE: replacements, I found these substantially cheaper than the Tangband

http://www.parts-express.com/aurasound-ns3-193-8a-3-extended-range-driver-8-ohm--296-258

Seem to get alot of good reviews.

[boon]

Never heard of them, they look good though.

I've never been a massive fan of aluminium cones is all, they tend to be a bit shrill for my tastes.

Preferred mid is a 3" silk dome driver but they're rare and pricey.

[heylinb4nz]

Think I may have found the perfect replacement, shall I hit the go button on my cart ???

https://www.parts-express.com/tymphany-tc9fd18-08-3-1-2-full-range-paper-cone-woofer--264-1062#lblProductDetails

- Cheap $75 shipped

- correct mounting depth

- spot on power handling 30rms

- low sensitivity (good as I don't want the midrange to high considering the location of them)

Although they are .5" higher I should be able to modify the factory fitting to accomodate them, or perhaps even epoxy them to inside of door cards behind the factory grill.