Yes I'm very interested too since I'm working on a vintage radio as well with the same raspberry 3 and hifiberry amp+. How does the speaker sound? And which audio player do you use? Would be nice hearing from you!
Antipode,
I'd be glad to share my impressions and experience as I go through the build. I haven't gotten in my raspberry pi & amp yet so I have no way to tell how it sounds.
I plan on starting with RuneAudio. I may switch to a Rasbian based software later since I know a little more about Rasbian than Arch Linux.
I'd like to use it for playing audio from an attached USB stick and listening to web radio. I have some desire to automate recording from internet radio. I think it would be cool if I could listen to the lastest BBC Shipping forecast before bed.
I'd be glad to share my impressions and experience as I go through the build. I haven't gotten in my raspberry pi & amp yet so I have no way to tell how it sounds.
I plan on starting with RuneAudio. I may switch to a Rasbian based software later since I know a little more about Rasbian than Arch Linux.
I'd like to use it for playing audio from an attached USB stick and listening to web radio. I have some desire to automate recording from internet radio. I think it would be cool if I could listen to the lastest BBC Shipping forecast before bed.
Thank you morecoffee1, I would definetely like to follow the course of your project. For me Spotify integration is important, but I believe Runeaudio is capable of this as well.
Update & Questions
Thanks for the help and interest in my project.
All the rest of my build parts came in and I tested the speaker. Just need to get the MDF and pick out replacement cloth. So far so good. I tested the speaker without mounting it. I thought it sounded good for no enclosure. Based on reviews of the amp at 75% it wasn't as loud as I expected, but it seems to get loud enough for me. Maybe partially due to using the lowest recommended power supply voltage. Will low end increase a little bit once it is mounted?
I wasn't sure if the specifications listed are for rear mounting or through mounting. I plan on rear mounting. Attached is a diagram of the speaker with arrows. Which arrow (or between) would you expect to meet the edge of the opening when mounted? How tight should the mounting bolts be?
I decided to try volumio instead of runeaudio first on the Pi because I was having trouble installing a plug in to go mono on runeaudio. I believe I got it to work on volumio but I need to download a file were the say "Left" on the left channel and "Right" on the right channel to make sure. Sadly I don't listen carefully enough to my music to know instinctively.
Thanks for the help and interest in my project.
All the rest of my build parts came in and I tested the speaker. Just need to get the MDF and pick out replacement cloth. So far so good. I tested the speaker without mounting it. I thought it sounded good for no enclosure. Based on reviews of the amp at 75% it wasn't as loud as I expected, but it seems to get loud enough for me. Maybe partially due to using the lowest recommended power supply voltage. Will low end increase a little bit once it is mounted?
I wasn't sure if the specifications listed are for rear mounting or through mounting. I plan on rear mounting. Attached is a diagram of the speaker with arrows. Which arrow (or between) would you expect to meet the edge of the opening when mounted? How tight should the mounting bolts be?
I decided to try volumio instead of runeaudio first on the Pi because I was having trouble installing a plug in to go mono on runeaudio. I believe I got it to work on volumio but I need to download a file were the say "Left" on the left channel and "Right" on the right channel to make sure. Sadly I don't listen carefully enough to my music to know instinctively.
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No specs listed, but it looks just like some old RadioShack drivers I have and if the specs are similar [~2.45 Qts], then it doesn't even need a baffle for vintage/AM playback [mine are currently just clamped to a shelf edge], so would indeed be a great choice even if it's only got a ~ > 1.0 Qts.
GM
You're welcome! Always nice to see these old radios in use.
No 'maybe' about it. 😉
No diagram shown, but normally are same-same front or back unless stated otherwise, though for rear mounting the cutout can be a little smaller, allowing a bit more 'meat' around the mounting screws in case you want to use T-nuts.
Folks tend to over-tighten smaller hardware regardless of the app and especially audio drivers IME, with seeing many bent/cracked/flat out broken frames to prove it, so ideally need a torque wrench unless one has a mechanic's 'calibrated elbow'.
While these can be had fairly cheap these days in many countries, all we really need is just enough to seal the gasket until the driver's excursion becomes enough to warrant more and even then it should be braced to allow proper torque values for the recommended hardware, so generally doesn't need to be much more than 'finger' tight.
Anyway, here's a NASA doc that covers all a DIYer will probably ever need to know about fasteners and their use: https://snebulos.mit.edu/projects/reference/NASA-Generic/NASA-RP-1228.pdf
GM
The large arrow points to the sealing gasket. The two smaller arrows point to the speaker's "surround", and ideally those are inside the cutout, so they don't hit the baffle. Your driver is ready for mounting from the inside of the baffle.
SP208/8
Hi !
SP205/8 Thiele-Small Parameters are :
100 - 17000HZ
94 db 1w/1m
8 w
Mms : 8g
Qms/Qes/Qts: 9,4 / 3,8 / 2,7
VAS : 21 L
Sd : 214 cm2
BL : 3.1 TM
Le 0.2mH
It seems (and it looks) that it is very good in open baffle.
See "Cheap Trick CT 269" for example. Very good reviews on it.
Guillaume
edit :
http://www.hifitest.de/test/selbstbauprojekt/monacor-kt_cheap_trick_269_8754-seite4
(is on my to-do list to play with my 2a3 amp)
Hi !
SP205/8 Thiele-Small Parameters are :
100 - 17000HZ
94 db 1w/1m
8 w
Mms : 8g
Qms/Qes/Qts: 9,4 / 3,8 / 2,7
VAS : 21 L
Sd : 214 cm2
BL : 3.1 TM
Le 0.2mH
It seems (and it looks) that it is very good in open baffle.
See "Cheap Trick CT 269" for example. Very good reviews on it.
Guillaume
edit :
http://www.hifitest.de/test/selbstbauprojekt/monacor-kt_cheap_trick_269_8754-seite4
(is on my to-do list to play with my 2a3 amp)
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Thanks!
Right, except for the RS having a little lower Fs, almost identical except without nearly as much of an upper mids dip/peak. FWIW, the RS only requires the Lowther $0.98 whizzer tweak and came with a really sticky coating on its formed surround like used to seal cloth corrugated surrounds, so wondering if that's why.
GM
Right, except for the RS having a little lower Fs, almost identical except without nearly as much of an upper mids dip/peak. FWIW, the RS only requires the Lowther $0.98 whizzer tweak and came with a really sticky coating on its formed surround like used to seal cloth corrugated surrounds, so wondering if that's why.
GM
Ah! Didn't see them in the small pic, so didn't blow it up.
Forgot.......yes, there will be a much 'fuller' sound once installed in the cab and assuming the driver seals well to the baffle.
GM
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